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Perk dime ol fs rhe +98 | eel 4 " O- Uearh ph vr + whe y en meg apusll ie tated? ‘ Y . at Fitba titpkeraticnid oe 1 ee a tintasenaole ob Od r4 8 fo 0 eer) Pine ¥ . Wee Rieageoge sta) aba SL USED Wo ede op bee rata ane 4 ~ islet get Se ai mee tar 9 Pwd go : 1 , boys toda hane * ote he 6 et hase it i iid a ue ekaaabaa seh een a err at clasteaesteeein= jor eC) Arey 0 Cre satiye 0 py t Tem emrurts pricy ns Nisa acecreverruisiheeebee We aiged gases atcae git “1 plete Ul Seopa werd Admehe cape coty spre SL Wnth eto beet iro einen i ape ntiebne Arehedan oie: ee heet gate Create donet rien oti ate aug: ge wear ney rh bry 4 ts at ae rs zs alti Sernypeesarroni vier * pri nage! tgtetten nek % OMY ated {oot bpeineyratrrrn Sf tient Bi utohedde ey Depa spot eet aie ay ; i dasa: Henne yresarec ry rrre crower el) Loreen eran dae site eoteareetiad 008, O &SPETOO TOEO oO 00 I a! ¥ Pon 6 OR 4 Ritaatr/ hare? \ a. Le UP nT} i ul * t { . ) AS , ! ara . i AD ' ¥ elt a be path tm [ TN AHALY tel coe Py Li nen roe Mir ey i iy mY eae | hi ne iY Dy, i alo ml rT a) 0 eA i q iy A Mm ny i ay wry Ty ue THE OEDOGONIACEAE A MONOGRAPH Including all the Known Species of the Genera Bulbochaete, Oedocladium and Oedogonium By LEWIS HANFORD TIFFANY, M. Sc., Ph. D. Associate Professor of Botany The Ohio State University fe, SS @ fe 2% Pee Xe) aXe, i Se ei” 1930 PUBLISHED BY THE AUTHOR COLUMBUS, OHIO THE SPAHR & GLENN COMPANY PRINTERS COLUMBUS, OHIO FOREWORD. For many years the only available keys to the Freshwater Algz of North America were those published by Francis Wolle about 1887. These were in larger part transcriptions of European descriptions often based on a single collection. Moreover, at that time it was a common practice to name specimens on the basis of vegetative characters or of immature reproductive structures. Consequently many of the records are erroneous and many others are questionable. In 1909 Frank S. Collins published a monograph of the Green Algze of North America. He not only added many species and records to the North American algal flora, but also corrected many of the previous errors in nomenclature and in the locality records, and brought the taxonomy of the green algze in America into harmony with the best usage in Europe. Collins’ keys stimulated a wide interest in the green alge in this country, and led to the publication of many local lists and papers describing new species. In the determination of algae, however, descriptions without plates are frequently difficult to interpret, and the greatest need of American students today is a series of illustrated monographs of the various families and orders. The world wide distribution of many of the freshwater alge, and the possibility that a species described from Australia may be found in Ohio has made it desirable that the monographs should attempt to cover all the described species. Too often the literature of a group is widely scattered and many of the papers are in obscure journals quite inaccessible to the average student. In 1900 Karl E. Hirn of Helsingfors, Finland, published in Latin and German a monograph of the Oedogoniacee that has been a model and inspiration for all algologists, but this volume and its supplement are now difficult to secure. Moreover many new species have been described and the descriptions by Hirn in many cases have been emended. It has seemed there- fore very desirable to publish descriptions and keys to all 5 the known species of Oedogoniacez in English. Dr. Tiffany’s extensive acquaintance with American collections, and the species found in European exsiccati over a period of fifteen years have given him an excellent foundation for a critical view of the group. It is the hope of the Department of Botany at The Ohio State University that this monograph will be followed in the near future by a monograph of the Zygnemales, and subse- quently of other groups of the filamentous alge. EDGAR N. TRANSEAU. TABLE OF CONTENTS PAGE 2) Ste aeons ASi6 Rea gE Re ARP or at 9 Heri NAee LOI to oer ee a ere ee tees Sie aiteah sch Ta egw 4 tht 11 Cell Structure, Reproduction, and Life History............ 12 Pesocieiny arid Disimibttions #:agenas4ccslescd< os eee ao. 22 haxononuc and Systematic: (reatment 9-4-2022... 5224.25 24 iewherlanuihy"Cedogoniacedes. Wen ae ass. 2 8 Sts ee te 2f aig SAID ewes on loyae ee, ees Mea oer See, a a ea Dif fee eiMeyan@mube (Genera ss... ees 2 |. Peete ieee eale es 27 Pee MeneG Cats ve MDOCHACLE. < 45582... tes desen es bie sss 2d Zi: DESC NG) 0 ee ae ae Re ek: eae ee ar 27 b. Key to the Species, Varieties, and Forms.......... 28 ec. Whe Species, Varieties, and Forms................°. 30 me elbnene ents Ocdocladiunay): a... 2 poe oper) sae een: 51 Fs ul DYSSICLE ONTO) se geee trees eee ROME OME A REBER s ta Seea eR A ae a! DMNBINMeNEL OREM Ee SPCCICSs o..0 64> a2: petra eyeenee oe of 51 ER, ec IP orS (SONS a ee a ie oY SCAM, 2 a ue er ce 51 Ae the Genus Ocdor entities: £2. 2.250.604 oa ee = 53 Ep B Yes an ialee, 5 & cee e CC Reon eee ee ae 2 58 b. Key to the Species, Varieties, and Forms.......... 53 ¢; The Species, Varieties, and Forms.....2..2........ 65 den species bmpertect lynKinown 25.72 45: se ae. eae 159 iabplccor pynonyms: dsalbochacte: «; 22..6..2 855.65 <2 tea: L73 Manicon synonyins: Ocdogonium: . 626224. .ce see se om eae 174 EL SISG TEAC OOS C0 OUR Be) aces pcre A teagan eee a [SST S CEIVED Ae Re oe a nC ee ee 184 LTETCVESE | 3 US cag. lccalle eater a See OR ieee ce Det eel ares ers Sel a a ee 185 JEAGTRESS RG Rees eG SUE ie oe uC a Og toe 189 7 PIHIIE ACKNOWLEDGMENTS. In attempting a complete report of a group as large as the Oedogoniacez, one encounters numerous difficulties. The liter- ature is bulky and in many languages. Type specimens are unavailable in some cases. Thanks, however, to the very careful work of Hirn (1900), many forms are perpetuated by extremely accurate and representative drawings. Some of the difficulties are matched, on the other hand, by the relative constancy of the characteristics of the species as they occur in aquatic habitats the world over. Many species appear in the writer’s own collections. It is almost impossible to give full acknowledgment to all who have assisted in making this monographic report possible. The writer has examined the material distributed in the Phy- cotheca Borealis-Americana and important collections generous- ly supplied by the following: Prof. E. N. Transeau, Ohio State University; the late Prof. O. Nordstedt; Prof. R. B. Wylie, Iowa State University; Prof. G. E. Nichols, Yale University; Prof. F. E. Lambert, Tufts College; Prof. W. R. Taylor, Uni- versity of Pennsylvania; Prof. C. J. Chamberlain, University of Chicago; Prof. I. F. Lewis, University of Virginia; Mr. G. H. Wailes, British Columbia; Prof. Alma B. Acklev, College of the City of Detroit; Prof. B. B. MclInteer, University of "Kentucky. Data on distribution of the genus outside of the United States other than that secured from the literature have been supplied by Mr. G. H. Wailes, British Columbia; Prof. O. Borge, Srocknolar: ror Kk. M.“Strom, Oslo; Prof. H: Skuja, Riga; Prof. N. N. Woronichin, Leningrad. The section on Bulbochaete in this report has previously appeared, in substance, in the TRANSACTIONS OF THE AMERICAN MICROSCOPICAL SOCIETY (Tiffany 1928). The text and plates dealing with that genus are incorporated herewith with the permission of the Society, kindly extended through its Secretary, Professor H. J. Van Cleave. My thanks are due Professor I. F. Lewis, University of Virginia, for the loan of his unpublished manuscript on the genus Oedocladium. Professor Lewis is 9 responsible for the emended description of the genus and for three of the four species now known (two are previously un- described). I am particularly indebted to my colleague, Professor E. N. Transeau, who has very graciously placed at my disposal all his notes on Oedogoniacee recorded during his long study of freshwater alge in the United States. He has offered many valuable suggestions during the fifteen years this study has been in progress. Leb t Department of Botany, The Ohio State University, Columbus, Ohio, January 2, 1930. 10 THE OEDOGONIACEE INTRODUCTION. Perhaps the most sharply circumscribed and clearly delimited group among the green alge is the family Oedogoniaceee. The members of its three genera—Bulbochaete, Oedocladium, and Oedogonium—are not only easily separable from other fila- mentous algz but also readily distinguishable from each other. The rather rigid vegetative cells, the prominent reproductive organs, the large zoospores each with a crown of cilia at the anterior end, the reticulate chloroplasts, and the attached habit are characteristics of the family. The filaments of Bulbochaete are branched and composed of cells each bearing at its enlarged upper extremity a laterally placed hair or seta. The sete are bulbous at the base, hollow, and frequently greatly attentuated, sometimes reaching a millimeter in length. Oedocladium is also branched but is devoid of hairs. Species of Oedogonium are unbranched and in common with Bulbochaete possess holdfast cells that provide attachment for the plants. Oedocladium hazenii* and species of both Oedogonium and Bulbochaete are aquatic. The remain- ing three species of Oedocladium are terrestrial. The family Oedogoniaceze was established by De Bary in 1854; the genus Bulbochaete by C. A. Agardh in 1817; Oedo- cladium by Stahl in 1891; and Oedogonium by Link in 1820. The most noteworthy contributors to the taxonomy of the group, other than those above, have been Pringsheim, Wittrock, Nordstedt, and Hirn. Since 1900 a number of algologists have added to our knowledge of the family by descriptions of new species, further notes on life histories, and data on geo- graphic distribution. A list of such workers includes Hirn and Hallas from Finland; William West, G. S. West, Fritsch, Carter, and Hodgetts from England; Borge from Sweden; Wille and Strom from Norway; Pascher and Heering from Germany; Skuja from Latvia; Collins, Transeau, Lewis, and Tiffany from the United States. There have been many other *In the Index the name of each new species, variety, or form is preceded by an asterisk. 11 12 TEE OBR DO'GONTA CEASE students of this algal family, and some of their names are found in the bibliography near the end of this monographic report. Some idea of the relative sizes of the three genera of the Oedogoniacee may be gained by a numerical recital of the composition of each. The genus Bulbochaete is composed of 48 species, 15 varieties, and 7 forms, with 3 additional species having incomplete descriptions. In Oedogonium there are 195 species, 76 varieties, and 38 forms; in addition there are 41 species and 3 varieties incompletely known. Oedocladium, by far the smallest, has only 4 species recorded to date. Although an Oedogonium, a Bulbochaete, or even an Oedocladium can be recognized on vegetative characters alone. the identification to species is impossible, except in a very few cases, without reproductive organs. Such unusual forms as Oe.* undulatum, B. horrida, Oe. nodulosum, or Oe. reinschii are perhaps always recognizable in vegetative states, but such species are few in number. The comprehensive reports of Pringsheim (1858), Wittrock (1874), Hirn (1900, 1906), and Heering (1914) are not readily available to many students of the alge, and their points of emphasis have been necessarily European. The early Ameri- can accounts of the Oedogoniacee by Wood (1872) and by Wolle (1887) are quite unreliable. The work of Collins (1909, et seq.) made available much European literature and was the first American publication on the green alge that was really trustworthy. Perhaps to Collins should go the credit for the initiation of real interest in freshwater alge in North America. Unfortunately his papers were inadequately illustrated. It is hoped that furnishing a complete English treatise of the family Oedogoniacez, including in addition to the taxonomic consider- ation, a discussion of the more important features of structure, reproduction, and distribution, will not only aid the student in the study of these common alge but will stimulate added interest in algology generally. CELL STRUCTURE AND REPRODUCTION. The cell wall of the Oedogoniacee exhibits a rigidity not common to other filamentous Chlorophycee. The heavy cellulose layer is covered peripherally with pectose, and upon *The abbreviation Oe. as used in this paper refers to the genus Oedogonium, and not to Oedocladium. When the latter is meant, the abbreviation is O. THE OEDOGONIACEAE 15 this is found in varying amounts another compound, resembling chitin. In Bulbochaete and Oedogonium the latter substance does not appear on the holdfast cell or dwarf male at the points of attachment. The cell may frequently be so heavily incrusted with lime that identification is not possible in that condition. The addition of warm lactic acid removes the calcium carbonate without undue change to the filament. Epiphytic small alge, including species of Oedogonium and Bulbochaete, are com- monly found attached to the rigid filaments. Fungal parasites, particularly certain Chytridiales, attack the plants both internally and externally. The vegetative cells are uninucleate with an elaborate parietal, reticulate chloroplast having one to many scattered pyrenoids. The chloroplast is quite variable in form, the network being considerably attenuated or hardly visible in the compact cylindrical mass (Carter, as reported by Fritsch and West, 1927). A rather peculiar characteristic of the family is the method of division of the vegetative cell which results in the so-called “‘apical caps.’’ Previous to the actual division there appears a ring-like thickening of the inner wall of the cell near its upper extremity. The growth of this ring ruptures the old wall circularly, and the outer layer of the ring becomes the new piece of cell wall. In the meantime nuclear division is followed by the formation of a cross wall at the middle of the cell, not connected at first with the cylinder. Later the septum assumes a permanent position near the lower part of the ruptured wall. The upper cell thus formed has a wall made up chiefly of the stretched ring, while the wall of the lower cell consists almost wholly of the lower part of the old cell membrane. The uprer cell, however, has at its upper extremity a part of the old cell wall which projects slightly, forming the cap. This apical cap is an excellent diagnostic character of the genus Oedo- gonium, although in some of the smaller species it is difficultly visible; and the number of caps in each cell denotes the number of divisions it has undergone. (Cf. Pl. LXI, figs. 598-600). In Bulbochaete there is rarely more than one apical cap to each cell, indicating, as will be explained later, that vegetative division in that genus occurs usually but once in a cell. (Cf. Pl. X, fig. 99). In Oedocladium usually only the terminal cell undergoes division as outlined above for Oedogonium. Intercalary growth 14 ee OLE DIO GON A CHE AE is apparently uncommon. The cap (or successive caps) may remain at the top of the terminal cell (Pl. LXIII, figs. 616 and 617 and 621; Pl. LXI, fig. 602) or be pushed aside, adhering to the side of the filament (Ml. LXII, fic. 611; PL LXIM, nia 622), The nuclear phenomena accompanying cell division were early investigated by Strasburger (1880) and Klebahn (1892). More recently Tuttle (1910) has compared mitosis in Oedogon- ium with that seen in higher plants. A single multiciliate zoospore is formed from the entire contents of a vegetative cell. Rarely a small amount of protoplasm is visible in the old cell after the emergence of the zoospore. The formation and liberation of the zoospore can readily be followed if the plants are brought into a warm room and observed under the microscope. The protoplast of the cell contracts slightly, and near one side appears a colorless area. A circular rent soon appears near the upper extremity of the cell in the vicinity of the apical cap. The mass then passes with a slow steady movement through the opening in the wall, being considerably constricted at the place of exit. Zoospores are formed from any cell of the filament except the holdfast. Upon release from the cell, the zoospore assumes a spherical or ovoid shape. It is at first surrounded by a thin gelatinous envelope which rather rapidly increases in volume and trans- parency and finally disappears. At the anterior end of the forming zoospore appears a colorless area, around the base of which occurs the crown of cilia. The zoospore is active for a short time, its movements becoming progressively less and less until it comes to rest. The cilia are absorbed and the clear anterior end becomes the attached part of the holdfast cell (Cf. Pl. X, figs. 84-92). Sometimes growth of the zoospore begins before movement has ceased. Upon germination, re- peated cell division occurs in the manner described above, except in those species where the first division does not result in the formation of a ring. In Oedogonium the sporeling thus formed develops into a filament by intercalary growth. The development of the germinated zoospore in Bulbochaete involves variations that deserve separate mention. The basal cell formed from the germinated zoospore is usually the only one capable of division, as far as the main axis is concerned. In some of the forms with ellipsoid oospores, however, inter- fatees OVE DOIG ON Tf A.C HAE 15 calary growth has been noted. The first division is of simple type, without a ring formation. The upper part of the cell is separated from the lower by a circular rent, but no new membrane develops between the two parts. As the new wall grows upward, the separated part is pushed to one side as a lid. The upper new cell grows out into a long tubular bristle with a swollen bulbous base. Subsequent divisions occur with the regular ring formation, and each new cell is intercalated between the basal cell and the next one above. The upper cell of each filament is therefore the oldest one. A lateral protrusion of each cell at its apex is cut off, developing into a hair. It is thus seen that the terminal cell bears two hairs, the other cells one each. Nearly every cell of Bulbochaete has two apical faces, one bearing a hair (or a cell of a side branch), the other the next upper cell of the main axis. Every cell of the principal axis of the filament, except the basal one, may cut off by an oblique division a lateral cell which becomes the basal cell for a side branch. By repeated divisions, first of the simple type and subsequent ones with ring formation, as noted above, this secondary basal cell (which of course is the primary basal cell of the side branch) forms the branch. Tertiary branches are formed similarly from the secondary ones, and so on through further branching. The mode of growth of the main axis is thus repeated by the side branches (See Plate X, figs. 93-99). The germination of a zoospore of Oedocladium is in many respects unlike that of either Oedogonium or Bulbochaete. The first cell formed upon germination develops into (1) the green filament with the rhizoidal cell forming as a branch; or (2) the rhizoidal filament with the chlorophyllose cell as a side branch; or (3) the green filament with the branch cell also green; or (4) a green filament without early branching. (Cf. Peete ne. 62 Pl Pooh, fie..623)-~ Théeformation of a branch in Oedocladium occurs by:the development of a circular rent in the upper extremity of a vegetative cell, forming an upper short ‘‘lid’”’ and a lower, much longer cylindrical piece. Through this rent the protoplasm of the forthcoming daughter branch cell with its initially thin wall protrudes. A new wall separating the branch cell from the cell of the main filament is then developed. This wall is attached to the juncture of the upper extremity of the cylindrical piece of the primary cell and the lower end of the branch cell, on the one hand, and to the 16 Pee OE DOICONTACEA'E original upper transverse wall of the primary cell, on the other. (Cf. Pl. L.XTI, figs. 606 and 612; Pl. EXITh figs, 616 and 623). Sexual reproduction of a rather advanced order has been observed in most species of the family. The position and relation of the oogonia and antheridia are used as classificatory items in all three genera. If oogonia and antheridia occur on the same filament the plant 1s monoecious (Pl. IX, fig. 69; Pl. XV, fig. 145); if on separate filaments, dzoecious (Pl. XX XIII, figs. 291 and 292). Oe. varians, Oe. trioicum, and perhaps a few others are both dioecious and monoecious. If dioecious, the male filaments may be about equal 1n size to the female, and the species is macrandrous (Pl. XXX, figs. 262 and 263). If the male plants are few-celled, much smaller (‘‘dwarf males”’ resulting from germinating androspores) and epiphytic on the female plant, the species is nannandrous (Pl. II, fig. 17; Pl. LII, fig. 494). If the dwarf males have arisen from the germination of androspores liberated from androsporangia occurring on the same filament with the oogonia, the alga is gynandrosporous (Pl. V, fig. 37; Pl. LIV, fig. 509; Pl. LXII, fig. 606); if the androsporangia are formed on separate filaments from the oogonia, the alga is zdioandrosporous (Pl. VII, fig. 53; Pl. XLV, figs. 434 and 435). A few species among the nan- nandrous sections are both gynandrosporous and idioandros- porous. ‘The dwarf males form on the suffultory cell (Pl. VII, fig, 52: Pl. L, fig. 482), or on the oogonium (Pl V7 mesa; Pl. LIV, fig. 508), or rarely scattered on vegetative cells (Pl. XLV, fre8 455). In Oedogonium and Oedocladium a single division of a vegetative cell results in an oogonium and a suffultory (‘‘sup- porting’’) cell (Pl. LXIV, figs. 638-640). The latter (in Oedogonium) may by subsequent divisions form a series of oogonia (Pl. LIX, fig. 577). Flat discoid cells resulting from repeated transverse divisions of a vegetative cell are antheridia (in the monoecious and macrandrous species) and andro- sporangia (in the nannandrous species). No seriate oogonia are recorded for the species of Oedocladium. : In Bulbochaete oogonia are developed singly, never in series. An oogonium arises by a double division of a vegetative cell which thus results in two suffultory cells. After the first division the septum becomes fixed near the middle of the old sheath-like wall “‘so that the membrane of the upper segment is formed by a short cylindrical piece of the latter and above ie Of DOGONITIACE AE 17 that by the stretching thickening ring which is becoming bulged out, forming the oogonium. A second thickening ring then develops in the median region of the young oogonium followed by a transverse rupture of the wall at this point; the septum formed in connection with this second division lies on a level with the top of the first-formed sheath, so that the supporting- cells are included in the latter. This curious development .is responsible for the fact that the wall of the mature Bulbochaete oogonium can nearly always be seen to consist of three pieces.”’ (West and Fritch 1927, p. 219). (Cf. Pl. LXIV, figs. 641-645.) If the lower of the two suffultory cells is the longer we speak of the division as supreme, superior, or supramedian, depending upon the relative lengths; if the upper is the longer of the two, the division becomes inframedian, inferior, or basal; if the two are equal in length, the division is median. In some species of Bulbochaete the position of the division is variable and cannot always be depended on as a distinctive diagnostic characteristic. If the two divisions are at right angles to the long axis of the vegetative cell, the oogonium is said to be erect; if one division is oblique, giving one suffultory cell a five-sided, or five-angled, appearance (viewed in optical section), the oogonium is patent. In members of the genus with globose (or nearly so) oogonia, the upper and not the lower suffultory cell is five-angled, while in those with more ellipsoid oogonia the reverse is true. In the latter case the upper cell is quite small, or may not be visible. A patent oogonium is always formed by a division of the basal cell of a side branch, with which may be associated a bulbous hair, an androsporangium, an antheridium, or rarely a vegetative cell. An erect oogonium on the other hand forms from a division of some vegetative cell other than the basal one. In the globose forms of the genus, patent oogonia are common while erect oogonia occur only in a few species. Among the ellipsoid forms both kinds are found. (Pl. LXIV, figs. 641-645). The oogonium contains a single egg and varies considerably in shape, being largely ellipsoid, ovoid, globose, or some variation of these shapes. It is usually of noticeably larger diameter than the vegetative cell, although in Oe. capillare and in a few others the difference is not great. The oogonium wall is rarely internally ribbed (as in Oe. acrosporum), punctate (as in Oe. minus), plicate (as in Oe. megaporum, Oe. platygynum) or provided with a transversely disposed ring of conical warts (as in Oe. itzigsohnit); in most species it is smooth. The FA QelCAly ik 0° Hoe a - e. Ge sunnng 18 THE OEDOGONTACEAE suffultory cell may be noticeably larger than the other vegeta- tive cells, or of the same diameter (Pl. LXIV, figs. 639-640). The opening in the wall of the oogonium may be a pore, either round and mouth-like, or rimiform, in which case the plant is designated as poriferous. An upper part of the oogonium may separate from a lower part, forming a lid; such species are operculate. The position of the pore as well as that of the operculum is quite constant for the species and is of considerable diagnostic value. The pore may be superior, supramedian, median, inframedian, orinferior. The division of the operculum TABLE I. Ready reference to illustrations of the kinds of ornamentations of oospore walls found in the Oedogoniaceae. It will readily be seen, upon examination of the figure, whether it is the middle or outer layer of the oospore wall with ornamentations. OosPoRE WALL SPECIES PLATE FIGURE NVR as 3 Ge oa OS AVOCA CHSTS a= a eee eee LXIII 614 Areolate:...< 4... Oenarcolatunier a. epee XXVIII 248 Dentate: 5. ctas 12 Oe NClevcaniurie
Vegetative cellsy15-20><45—-100us . a5. 1. . oe aes 17. B. polyandria 20. Vegetative cells 17-22X54-88y.............. 17a. B. polyandria f. notabilis 21. Vegetative cells less than 12u in diameter............... 48. B. spirogranulata Zi Vegetative cells more than\ 12, in diameters... 40a eee een 22 22 MONOCCIOUS!. 05. cccc ace Sak hiescecms RAS On BE ere 23 22: Dioeciouss nannandrousy.2.04 6.2 eae ee ee eee 29 22. Reproductive structures imperfectly known.............. 49. B. brevifulta 235) Poreof oogonitim» less than ow wider. meet cee ee 24 23.) Pore of oogoniumi more than du wide... s25+ 456) o ae 3. B. megastoma 24. Vegetative cells l=idiametersilonee-- eee ee eee eee 25 24. Vegetative cells 1/-2 diameters long /).9.507. 5.5. 6ek eee ee 26 204 Oogonitim~ 24-28 u inidiamebenaaaseaetiase een eee eee 4. B. basispora 25. Oogonium 28-34u in diameter......................2a. B. monile var. robusta {+ Some variations of B. nordstedtii and B. polyandria may be sought here. BULBOCHAETE 29 Ph Oosonium Tnesulanlyaellipsoide naa. cs-.cere css. o5- ce oe © 5. B. debaryana Zoe Oozonumicylindric to oplong-ellipsoide tec... s + douse) tees es eee a: D7 enathvot cogontitim 4048p)... 2 cae one sem cee 6a. B. mirabilis £. immersa iAMUCH AG hkOL OOZONIIMAA —OOM ae «cecil a Meee Meee eis seve ee, oe edu cnn dies ce betes 28 28. Diameter of vegetative cells 13-l6u.......... 6b. B. mirabilis var. gracilis 28. Diameter of vegetative cells 15-20u..........2........-.-. 6. B. mirabilis POBOospore walllismooth= Veeco tcs ook cst tere ae lae es Raat PSE Acs heetcns 30 Pi MaEpULeayallceromiemlateas:. Hose aeons ier de te Wad tenes es Sneed aes wes 32 Zi wOospore wall reticulate-scrobicilates./). Aik ecsec ceed i ek cee es 18. B. gigantea SEO CVS Shenae cyl lire oY 2X6 | oc IERS CPIE So G o oe en 41 BOM Divistonomsmirtultonmy cellubasalure .sasassaace. + 6s. 3 19. B. diamesandria 20S Division of suinul tomyacelll median! on nearly. So: . 53... 44.6.0. cece ee ss 31 30. Division of suffultory cell superior............... 22a. B. sessilis f. glabra Slem@Oorontam abomt4G X44 yes cles 2 oe aietroers oars cee ee ahe 20. B. elachistandria Bree Moroni 25-04 X 43 ier oe oss es omen athe © cin plsnruibven's eleres wale « 21. B. obliqua Spr, “Dikenaakeqnere yt roretoranobaa, A000 ie, daa hae comics 6.0. On ORI e SERGI icrcace aire eee 33 SZ Diameter Gr OOZOnilina GO=cUmen scene oan ie ac dae oe Sew ac eens aes 38 338. Division of suffultory cell supreme............. 25a. B. dispar var. ripartiana DOMED inistOMmmomSuimmltory Cell SUpeMOLs aioe oie cele es sesso se hem ane 34 33. Division of suffultory cell supramedian, median, or inframedian............ 35 Boe Divisfoncomsuibiul tory: cell ibasall.,..35:..5. sacieieciee ee aes: os 9. B. brebissonit q4-.Ooconum subguadrangular-slobgse. .1- 54.6 424-ee a: os. 22. B. sessilis SA Ooronium stiodepressed-slobose.. .4.--s ace ase eaeie ee os - 25. B. dispar Meee FTE MOT OISE MEER. Siete orci cn == seein cars wes Sa emo ato gs kee ee eso 36 Pmlici@andEn@spOROUSHeL 4 -wiclseet ais ois o,s0ue Cee 2 Sem Spelt rear re 31. B. congener SO Diametemo- oozonmumr4O—ollin. 550 |... ayn). cide Pe ae) ereuene (ore ss eles 37 BOs Diameter OOO ZOMITMALO2—OOp a. 6 scl. «+o - eben ae eee ea 28.. B. crassa Sieviesctative cells [2 diameters long. .: ......seedqeee+ sce s< 30. B. quadrata 37. Vegetative cells.2-5 diameters long............2........ 13. B. subintermedia SSE Gaunt GijOs POROUS ar eres eisicss eer hae + aces eee thse Ra ere Menage roa - 39 OMG O att GrOSPOLOUS My facts Ooroniuin broadly ellipsoid, fo ovoid: 2.2... 2.056066 6ee eas oe es ae 50 AD STOMOOSMOLEISIMOOtM <2 sac c ce cles fe alee ee age oe be ae 40. B. rhadinospora AD eet OSpOM OOSPOLeeLrentla tes. 0.26 oth eee wens ate 40a. B. rhadinospora f. antiqua 50. Ribs of oospore coarsely serrate or crenulate........ 2 39 B. lagcensis HUsiadbs OfOoSpore dinelysserrate OF SMOOtM (0... 6... 5056 - eine Ae le sees oe 51 iene ative Cells, US 2527-0. 5 aos rea om ie ork tas tee nite Oe eee 41. B. minor 51. Vegetative cells 15-22 22-66y.................-. 41a. B. minor var. germanica SUMO ont 29—3 1 IEG IATE LEI... =. - os ellaso sae eee he ek eee tse 53 52. Oogonium 38—45yu in diameter........... 40b. B. rhadinospora var. litoralis SO OSOMUTINAl—OOW AMMGIAIMELCL Me +. secicic sees ieeion c Aelce oes ce oes oe tke 54 pe Oo onium. o6-G0u In GiamMetenrs ....-c0 seedae tet ese ce wee 42. B. bullardi HP A OOSONMNNOS=O2 patel CIAIMETEL s..ocsycdce conse kone oe es ee ome cele seudinle ss 58 30 THE OEDOGONINGE AE 53) sRabS OMOOSPOre SMOOTH. ..;\.... 2s doan wee ee eee 40. B. rhadinospora 532 Rabsloloospore crentilates: 5... ice eee eee r= 40a. B. rhadinospora f. antiqua HAreViesetativecells 19-27 in diameteros- caer eee cero ee en eennee 55 54. Vegetative cells 27—30u in diameter..................... 43. B. denticulata 55 Oogonium:41—46u imdiameter. 4). sree Pein ees elena ee 44. B. affinis Hs Oozonium 46-h6u in diameter... ceemateramine a. eminence eae ee ere 56 56. Vegetative cells! 19—-25<40 100 wiry s-ncteieveen er toreitere aie ina eee ee 57 5G. wWesetativecellls aibouic iota ere ataein eee 45. B. anomala Dieekabs of oospores broadiyadenticulates seeds er eee tee 46. B. insignis 57. Ribs of oospores reticulate-denticulate......... 46a. B. insignis var. reticulata 58e Oogoniumeloboseaanwaeo ee Tee rece 24. B. alabamensis 58: Oogonium py ritonitysss seer ec acter ty seem ere 32. B. pyrulum Hs. Oovconmumpellipsoidee eter eee etter te 47a. B.imperialis var. regalis HO Vieretative cellsyblood-redsinicolotas.. + eae 50. B. sanguinea* HO Viecetativercellsmmedianily splicatesn-. -caeu icici aster eee 51. B. horrida* 1. B. nana Wittrock. (Pl. IX, fig. 75.) 1872, p. 7, Pl. 1, fig. 9; 1874, p. 50; B. nana Wittr. var. subbasispora Wittr. 1874, p. 50; Hirn 1900, p. 349, Pl. LVI, fig. 362; Collins 1909, p. 272; Heering 1914, p. 229, fig. 349: West 1916, p. 396, fig. 251c; Tiffany 1928, p. 132, Pl. XXII, fig. 75. Monoecious; oogonia ellipsoid, patent, below terminal setae or vegetative cells; outer wall of oospore longitudinally ribbed; antheridia 1-2f, erect (rarely patent) subepigynous or scattered; vegetative cells 10-16 X10-22u; oogonia 20-25X33-40u; oospores 18-23X30-38y; antheridia 7-9 5-9u. Greenland, Alaska, Ceylon, India, Austria, England, Fin- land, Germany, Latvia, Sweden, Norway, Turkestan. 2. B. monile Wittrock and Lundell. (Pl. IX, fig. 72.) In Wittrock 1874, p. 50; (?) B. nana Wittr. in Wolle 1887, p. 100; Hirn 1900, p. 348, Pl. LVII, fig. 360; Collins 1909, p. 272; Heering 1914, p. 229, fig. 348; Tiffany 1928, ps 132, Pl: XOGU, fie.72;.P. B.A. No. 1432. Monoecicus; usually few celled; vegetative cells short and some- times globose; oogonia ellipsoid, patent (rarely erect), below terminal setae or vegetative cells; outer wall of oospore longitudinally ribbed; antheridia 1-2, erect or patent, subepigynous or scattered; vegetative cells 11-16 10-16u; oogonia 22-25 X 30-38; oospores 20-23 XK 28-35; antheridia 8-10 6-8u. United States: Massachusetts, New Jersey; Sweden, Fin- land, Latvia; British Columbia. 2a. Var. robusta Hirn. (Pl. IX, fig. 73.) 1900, p. 349, Pl. LVII, fig. 361; Heering 1914, p. 229; Tiffany 1928, p. 133, Pl. XXII, fig. 73. *Species of incomplete descriptions and included in the key with such char- acters as are available. 7See foot note, page 65. BULB OCH AETE 31 Oogonia considerably larger and broadly ellipsoid; vegetative cells 14-19 14-194; oogonia 28-34X39-45u; oospores 26-3237-42u; antheridia 8-10 X5-8u. Germany. B. nana and B. monile, as far as specific dimensions are concerned, are quite similar plants. If one has a mature plant of the former, however, he will find vegetative cells longer than their width, and this is almost never the case in the latter. The variety robusta is easily separated by its longer oogonia. 3. B. megastoma Wittrock and Lundell. (Pl. IX, fig. 76.) In Wittrock 1874, p. 51, Pl. 1, fig. 21; Hirn 1900, p. 354, Pl. LIX, fig. 370; Heering 1914, p. 231, fig. 353; Tiffany 1928, p. 1383, Pl. XXII, fig. 76. Monoecious; oogonia ellipsoid to subcylindric ellipsoid, patent (rarely erect), below terminal setae or vegetative cells, with large mouth-like pore; outer oospore wall longitudinally ribbed; antheridia 1-2, erect (rarely patent), scattered or subepigynous; vegetative cells 18-24 18-354; oogonia 32-36X48-54u; oospores 30-34X46-52y; antheridial cells 10-13 & 7—9u. Sweden, Denmark. The large mouth-like pore of the oogonium rather readily separates mature plants from any others of the genus. 4. B. basispora Wittrock and Lundell. (Pl. IX, fig. 74.) In Wittrock 1874, p. 50; Hirn 1900, p. 350, Pl. LVIII, fig. 364; Heering 1914, p. 229, fig. 350; Tiffany 1928, p. 133, Pl. XXII, fig. 74. Monoecious; oogonia ellipsoid or subcylindric-ellipsoid, patent or erect, below vegetative cells; outer oospore wall longitudinally ribbed; antheridia 1-3, patent or erect, scattered or subepigynous; vegetative cells 15-19 15-23; oogonia 24-28 X 40—45y; oospores 22-95 X38- —43u3 antheridia 8-11 X6—8uy. United States: Ohio; Sweden. Among the monoecious forms B. basispora bears some resemblance to B. debaryana and B. mirabilis, but can usually be distinguished by its relatively shorter vegetative cells and its oogonia. 5. B. debaryana Wittrock and Lundell. (Pl. IX, fig. 77.) In Wittrock 1874, 51; Hirn 1900, 353, Pl. LIX, fig. 369; Heering 1914, Pe2ol, fig. oo2: Tiffany F998" job UBB} Lk ¥XIL figs dike Monoecious; oogonia ellipsoid, patent, below vegetative cells or terminal setae; outer wall of oospore longitudinally ribbed; antheridia 32 Vink (O18 DiOGOIN EMG E AE 1—?, patent or seldom erect, subepigynous or scattered; vegetative cells 18-22 23-44u; oogonia 27-33 X43-50u; oospores 25-30 X 40-48u; antheridia 10-12 * 8—9u. Sweden, Latvia, Canada. 6. B. mirabilis Wittrock. (Pl. IX, fig. 69.) 1870, p. 137, Pl. 1, figs. 8 and 9; 1874, p. 50; B. sp. Reinsch 1875, p. 81; B. mirabilis Wittr. var. lapponica Wittr. and Lund. im Wittrock 1874, p. 51; Hirn 1900, p. 351, Pl. LVITI, fig. 365; Hirn 1906, p. 57; Collins 1909, p. 272; Heering 1914, p. 229, fig. 351; Tiffany 1928, p. 1384, Pl. XXII, fig. 69; P. B. A. No. 1481. Monoecious; oogonia cylindric-ellipsoid to suboblong-ellipsoid, patent (rarely erect), below terminal setae or vegetative cells; outer wall of oospore longitudinally ribbed; antheridia 1-4, erect or patent, subepigynous or scattered; vegetative cells 15-2020-40u; oogonia 26-33 X 46-58; oospores 25-31 XK 44-56u; antheridia 9-12 X6—9n. United States: New Jersey, Michigan, Illinois, Minnesota; Greenland, Africa, Europe, Australia, Siberia, Mongolia. 6a. Form immersa (Wittrock) Hirn. (Pl. IX, fig. 70.) 1900, p. 352, Pl. LVIII, fig. 867; B. mirabilis Wittr. var. immersa Wittr. 1874) p. 51; Heering 1914, p. 230; Tiffany 1928, p. 134, Pl. XXII, fig. 70. Vegetative cells 13-17X16-30u; oogonia 25-33 X40—-48u; oospores 23-30 X 38-46u; antheridia 7-11 6-8. Norway, Germany. 6b. Var. gracilis (Pringsheim) Hirn. (Pl. IX, fig. 71.) 1900, p. 353, Pl. LIX, fig. 368; B. gracilis Pringsh. 1858, p. 74; Wittrock 1874, p. 57; Heering 1914, p. 230; Tiffany 1928, p. 134, Pl. XXII, fig. 71. Vegetative cells 13-16 17-32u; oogonia 20-28 X47—-55yu; oospores 18-26 X 45-53u; antheridia 8-11 6-8uy. Germany, Sweden, Denmark. 7. B. elatior Pringsheim. (Pl. I, fig. 1.) 1858, p. 73, Pl. 6, fig. 5; Wittrock 1874, p. 49; Hirn 1900, p. 321, Pl. LI, fig. 327; Hirn 1906, p. 56; Heering 1914, p. 231, fig. 355; Tiffany 1928, p. 134, Pl. XIV, fig. 1. Dioecious, nannandrous, gynandrosporous; oogonia depressed globose to depressed subquadrangular-globose, erect or seldom patent, below androsporangia; division of suffultory cell basal; oospore smooth; androsporangia epigynous or rarely scattered, 1-2; dwarf males usually on suffultory cells, antheridia exterior, unicellular, stipe scarcely longer than the antheridia; vegetative cells 13-18 20-63; oogonia 34-44 X31-38u; oospores 32-4229-36u; androsporangia 10-13X8-11y; dwarf male stipe 8-10 X 18-35y; antheridia 6-8 X 9-1 1p. United States: Massachusetts; India, Ceylon, Austria, Aus- tralia, Germany, Sweden, New Caledonia. BwEp OCH AE T Eb 33 7a. Form pumila Hirn. (Pl. I, fig. 2.) 1900, p. 322, Pl. LI, fig. 328; Tiffany 1928, p. 135, Pl. XIV, fig. 2. Smaller; vegetative cells 10-15X25-60u; oogonia 31-37 X28-37u; androsporangia 10-11X9-llu; dwarf male stipe 8-1019-24n; antheridia 7-9 X6-8u. Brazil. 7b. Var. scrobiculata Tiffany. (Pl. I, fig. 3.) 1928, p. 135, Pl. XIV, fig. 3. Similar to the type except outer oospore wall is minutely scrobiculate; ° antheridia 1—2; vegetative cells 13-16 X 28—40y; oogonia 28-44 & 28-36; oospores 26-42 X26-34u; androsporangia 10-13X10-16u; antheridia 6-8 X 4-7; dwarf male stipe 11-13 X 16—20u. United States: Alabama. This variety clearly belongs with B. elatior because of its exterior antheridia, although the oospore markings are similar to those of B. brebissonit. It is barely possible, of course, that B. elatior sometimes has scrobiculate oospores, although there is no evidence for it. Until such time as more is known about the variations, if any, in the oospore of the species, it seems best to catalogue the separate variety, as above. S. B. minuta West and West. (Pl. I, fig. 9.) 1902, p. 126, Pl. 17, fig. 10; Hirn 1906, p. 25, Pl. IV, fig. 28; West 1916, p. 388, fig. 242: Tiffany 1928, p. 135, Pl. XIV, fig. 9. Dioecious, nannandrous, gynandrosporous: oogonia depressed- globose, patent or erect, below the androsporangia; division of oogonium median or nearly so; suffultory cells without division, or with division basal; oospore wall smooth; androsporangia unicellular, epigynous; dwarf males on suffultory cells, antheridia exterior, unicellular, stipe twice as long as antheridia, curved; vegetative cells 9-1218-35u; oogonia 29-35 X 24-27; oospores 27-33 X 22—25yu; androsporangia 9-11 x6-9n; dwarf males 6-7 X 18-20p. Heneratgodha, Ceylon. B. minuta is among the smallest of the genus, the length of its oogonium being less than that of any other known species. 9. B. brebissonii Kuetzing. (Pl. I, fig. 7.) 1854, p. 19, Pl. 86, figs. B and f; B. tumida Wittr. 1870, p. 139; 1874, p. 46; Hirn 1900, p. 323, Pl. LI, fig. 330; Collins 1909, p. 268; Heering 1914, p. 231, fig. 356; Tiffany 1928, p. 135, Pl. XIV, fig. 7. Dioecious, nannandrous gynandrosporous; oogonia depressed-sub- quadrangular-globose, erect, below terminal setae or androsporangia; 34 TE © EDO GO Niwa AGE division of the suffultory cell basal; outer oospore wall scrobiculate; androsporangia scattered or epigynous, 1-3; dwarf males on oogonia (rarely on adjacent cells), antheridia interior, stipe slightly curved, shorter than antheridia; vegetative cells 17—2050-90yu; oogonia 49-50 X37-45u; oospores 40-48X35-43u; androsporangia 11-15 12-18u; dwarf males 10-12 X 28-33. United States: Massachusetts, Illinois, Alaska; Europe. This species is rather readily distinguished by its usually basal division of the suffultory cells, its interior antheridium, and its erect oogonia. It is distinguished from the variety minor by its larger size. 9a. Var. minor Woronichin. 1923, p. 99; (2) B. brebissoni Kuetz. f. in Borge 19238, p. 30; Tiffany 1928, p. 136. Smaller than the type; vegetative cells 13-17 X20-100u; oogonia 35-38 X 31-388; oospores 33-36 X 29-364; dwarf males 8-9 X 26-27. minis Caveasus. 10. B. furberae Collins. (Pl. I, fig. 8.) 1918a, p. 142, Pl. 124, figs. 1-5; Tiffany 1928, p. 136, Pl. XIV, fig. 8. Dioecious, nannandrous, gynandrosporous; oogonia depressed globose, below terminal setae, patent (rarely erect); division of suffultory cell inframedian; outer wall of oospore scrobiculate; androsporangia scattered, 1-9; dwarf males on oogonia, stipe strongly curved; antheridia interior; vegetative cells 10-15X30-75u; oogonia 36-43X27-34p; oospores 34-41X25-32u; androsporangia 9-108-9u; dwarf males. 1-8 X20—25p. United States: Massachusetts (Woods Hole). This species differs from B. elatior in its scrobiculate spore wall and its division of suffultory cell. It is smaller than B. brebissonit. 11. B. crenulata Pringsheim. (Pl. I, fig. 4.) 1858, p. 72, Pl. 6, fig. 4; B. crenulata Pringsh. var. plena Wittr. 1872, p. 19; Wittrock 1874, p. 45; Hirn 1900, p. 331, Pl. LIII, fig. 337; Collins 1909, p. 269; Heering 1914, p. 238, fig. 359; Tiffany 1928, p. 136, Pl. XIV, fig. 4. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- globose, patent, below terminal setae or androsporangia, or rarely vegetative cells; division of suffultory cells median or slightly below; spore wall scrobiculate to crenulate; androsporangia epigynous or scattered, 1-5; dwarf males on or near oogonia, antheridia interior, stipe slightly curved, shorter than antheridium; vegetative cells 16-20 X 32-70u; oogonia 43-48 35-43u; oospores 40-46 X33-40u; antheridia 10-15X7-10u; dwarf males 9-10 X 24—26un. Bower oce LE TE 3D United States: Michigan, Illinois; Australia, Finland, Ger- many, Norway, Sweden, Denmark, Patagonia. B. crenulata has often been confused with forms of B. intermedia, since the ‘‘crenulations’’ of the oospore walls are not always distinctly “‘crenulate.’’ It seems best, however, to retain the two as distinct species because (1) the latter normally has longer cells in proportion to diameter and (2) the two species normally represent extremes of a series of gradations in oospore wall ornamentation: B. intermedia may have nearly smooth to scrobiculate oospores, while those of B. crenulata vary from distinctly scrobiculate to crenulate. 12. B. intermedia De Bary. (Pl. I, fig. 5.) 1854, p. 72, Pl. 4, figs. 1-7; Wittrock 1874, p. 44; B. crenulata Pringsh. var. supremediana Wittr. 1883 in Wittr. and Nordst. Alg. Exs. Fasc. 11, No. 509; (?) B. elachistandria Wittr. in Borge 1896, p. 3; Hirn 1900, p. 326, Pl. LII, fig. 333; B. intermedia De Bary f. americana Hirn 1900, p. 328, Pl. LII, fig. 334; B. intermedia De Bary f. supramediana (Wittr.) Hirn 1900, p. 328, Pl. LII, fig. 335; Hirn 1906, p. 56; Collins 1909, p. 268, fig. 82; Heering 1914, p. 233, fig. 358; Tiffany 1926, p. 109, Berio O 7m O2Se pels ible oeiyn tesa PB. Av Non 973: Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- globose, patent, below androsporangia; division of suffultory cells nearly median; outer wall of oospore scrobiculate, rarely apparently smooth; androsporangia 1-2, epigyncous or rarely scattered; dwarf males on the oogonium; antheridium interior, stipe slightly curved, shorter than the antheridium; vegetative cells 17-20 35-70u; oogonia 40-48 X 31—40y; oospores 38-46 X 30-38; androsporangial cells 11-13 X 7-12u; dwarf males 9-10 X 21—26u. United States: Iowa, Illinois, Ohio, Michigan, Connecticut, Pennsylvania, Massachusetts, Alaska; Canada, Australia, Europe, Greenland, Africa. 12a. Var. depressa Wittrock. (Pl. I, fig. 6.) 1874, p. 44, Pl. 1, fig. 18; Hirn 1900, p. 329, Pl. LII, fig. 336; B. intermedia De Bary var. depressa Hirn in Heering 1914, p. 233; Tiffany 1926, p. 109; 1928, p. 137, Pl. XIV, fig. 6. Vegetative cells a little longer than in the type; oogonia depressed- globose; outer oospore wall scrobiculate, often nearly smooth; division of suffultory cell a little above the median position (rarely a little below median); vegetative cells 14-19X35-88yu; oogonia 42-4630—40p; oospores 40-44 28-38u; androsporangial cells 11-13X9-12u; dwarf males 9-11 22-25 United Stas: Iowa; Finland, Germany, Norway, Sweden; British Columbia. Hirn recognized with B. intermedia its variety depressa and two forms, americana Hirn and supramediana (Wittrock) 36 LHE: OED OGON 1A CEASE Hirn. I have seen a great number of intermedia plants from the North Central states, and judging from this American material and from original descriptions, it seems almost impos- sible to recognize with certainty either of the two forms above; the variety is probably distinct. Occasionally individual plants and more often parts of filaments are found with slight differ- ences and variations in form and shape of vegetative cells and oogonia. Frequently all variations between the type and the two forms can be noted in one plant. The variety depressa with relatively longer cells in proportion to diameter is perhaps sufficiently distinct to recognize. It does not appear to be to the best interests of taxonomic nomenclature in this species to do little more than recognize its variability. I have, therefore, included with the species proper the two forms americana and supramediana. The relationship to B. crenulata is noted above, under that species. 13. B. subintermedia Elfving. (Pl. Il, fig. 15.) In Hirn 1895, p. 8; Hirn 1900, p. 332, Pl. LIII, fig. 338; Heering 1914, p. 233, fig. 360; West 1916, p. 396, fig. 251A; Tiffany 1928, p. 188, Pl. XV, fig. 15. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- globose, patent, below terminal setae, androsporangia, or rarely vege- tative cells; division of suffultory cell submedian; outer spore wall scrobiculate; androsporangia 1—’, epigynous or scattered; dwarf males on oogonia, stipe curved or nearly erect, shorter than the oogonia; vegetative cells 17-2234-100u; oogonia 44-51 X39-44y; oospores 42-48 X37-41u; androsporangia 13-16X9-10u; dwarf males 10-12 25-30u. Finland, Great Britain. 14. B. angulosa Wittrock and Lundell. (PEST ig. 143) In Wittrock 1874, p. 45; (?) B. elachistandria Wittr. in Wolle 1887, p. 97; Hirn 1900, p. 336, Pl. LIV, fig. 346; Heering 1914, p. 235, fig. 364; Tiffany 1928, p. 138, Pl. XV, fig. 14. Dioecious, nannandrous, gynandrosporous; oogonia biconically and angularly globose, apically truncate, below terminal setae or rarely androsporangia; division of suffultory cells a little above median position; oospore wall smooth; androsporangia scattered or epigynous, 1-3; dwarf males on oogonia, antheridia interior, stipe somewhat curved; vegetative cells 13-18X20-45yu; oogonia 36-42X33-39u; oospores 34-40 X 30-364; androsporangia 10-11X9-10u; dwarf males 8-9X 18-21. United States: Pennsylvania; England, Sweden, Finland, Africa. BULB OCH AETE 37 14a. Form picta Hirn. 1900, p. 337. Of smaller dimensions; vegetative cells 13-16X19-40u; oogonia 33-38 X 31-37. Brazil. 15. B. borealis Wittrock. (Pl. Il, fig. 10.) 1870, p. 138; 1874, p. 46; Hirn 1900, p. 324, Pl. LI, fig. 331; Heering 1914, p. 233, fig. 357; Tiffany 1928, p. 1389, Pl. XV, fig. 10. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- globose, patent, below vegetative cells, wall thick; division of suffultory cell superior (occasionally nearly supreme); outer oospore wall scrobicu- late or sometimes nearly smooth; androsporangia 1-3, subepigynous, patent: dwarf males on oogonia, antheridia interior, stipe a little curved, shorter than antheridia; vegetative cells 16—-21X20-42u; oogonia 40-48 X 35—40u; oospores 38-46 X 33-38; androsporangia 12-13 *8—-9y; dwarf males 9-10 X18—21y. Norway, Sweden, Finland. 16. B. nordstedtii Wittrock. (Pl. II, fig. 17.) 1874, p. 44; Hirn 1900, p. 332, Pl. LIII, fig. 339; Collins 1909, p. 269; Heering 1914, p. 234, fig. 361; West 1916, p. 396, fig. 251B; Tiffany 1928, p. 139, Pl. XV, homldae) barALe NOt Dioecious, nannandrous, gynandrosporous; oogonia depressed- globose or subquadrangularly so, patent, below androsporangia or rarely terminal setae; division of suffultory cell superior (occasionally submedian); oospore wall finely scrobiculate or nearly smooth; andro- sporangia unicellular, epigynous; dwarf males on oogonia, stipe slightly curved, shorter than antheridia; vegetative cells 14-18X28-85uy; oogonia 36-43X29-36u; oospores 34-4127-34u; androsporangia 10-12 X9-12u; dwarf males 9-19 X 23-25un. United States: Ohio, Illinois, Connecticut, Alaska; Green- land, Australia, Finland, Germany, Spain, Sweden, Austria, Ireland. 16a. Form suberecta Collins. (PI. If, fig. 18.) 1912, p. 88; Tiffany 1928, p. 189, Pl. XV, fig. 18. Smaller; oogonia 28-32 34-38u, depressed-globose, often erect. United States: Massachusetts. The suberect habit of this form appears to be very incon- stant, but the smaller dimensions warrant a separate form. 16b. Var. minor Woronichin. 1923, p. 99. Vegetative cells 10-1220-25u; oospores about 36X33yu; dwarf males 8-10 19-20. Tiflis (Caucasus). 38 EE JODO: GO mNtyACGsn ACE 17. B. polyandria Cleve. (Pl. Il, figs. 11 and 12.) In Wittrock 1870, p. 140; B. polyandra Cleve in Wittrock 1874, p. 46; Hirn 1900, p. 3384, Pl. LIV, fig. 342; Collins 1909, p. 270; Heering 1914, p. 234, fig. 362; Tiffany 1928, p. 140, Pl. XV, figs. 11 and 12; P. B. A. No. 1682. Dioecious, nannandrous, idioandrosporous; oogonia subdepressed- globose, patent, below terminal setae or vegetative ceils; division of suffultory cell superior (rarely submedian); outer oospore wall scrobiculate or nearly smooth; androsporangia to 10-seriate; dwarf males on oogonia, antheridia interior, stipe slightly curved, shorter than antheridia; vegetative cells 15-20*45-100u; oogonia 39-46 32—42u; oospores 37-44 30-40"; androsporangia 12-14X11—l5u: dwarf males 8-9 X 23-26u. United States: Massachusetts, Florida; Brazil, Europe. 17a. Form notabilis Hirn. — (Pl. II, fig. 13.) 1900, p. 334, Pl. LIV, fig. 348; Tiffany 1928, p. 140, Pl. XV, fig. 13. Division of suffultory cell often supreme; vegetative cells 17-22 X51-88u; oogonia 41-46X36-48u; oospores 39-44 34-41y; andro- sporangia 12—-14X12-15u; dwarf males 8-10 X23-25n. Great Britain. 18. B. gigantea Pringsheim. (Pl. V, figs. 35 and 36.) 1858, p. 71, Pl. 6, fig. 1; Wittrock 1874, p. 48; Hirn 1900, p. 347, Pl. LVII, fig. 359; Collins 1909, p. 271; Heering 1914, p. 239, fig. 373; Tiffany 1926, p. 109, Pl. X, figs. 108-110; Tiffany 1928, p. 140, Pl. XVIII, figs. 35 and 36. Dioecious, nannandrous, idioandrosporous; oogonia subdepressed globese or rarely depressed oboviform-globose, patent, below terminal. setae, rarely below vegetative cells; division of suffultory cell slightly below median; outer wall of oospore reticulate-scrobiculate; andro- sporangia 1-5; dwarf males slightly longer than the oogonia on which they develop; antheridia interior; stipe about twice as long as antheridium, curved; vegetative cells 24-3250-112u; oogonia 60-70X50-58y; oospores 58-68 X48-56u; androsporangial cells 18-2010-14y; dwarf male stipe 10-13 28—45u; antheridial cell 13-14 20-380u. United States: Michigan, Florida, Iowa, Pennsylvania; Australia, Europe. 19. B.diamesandria Nordstedt and Hirn. (Pl. II, fig. 16.) In Hirn 1900, p. 323, Pl. LI, fig. 329; Tiffany 1928, p. 140, Pl. XV, fig. 16. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed- globose, erect, below terminal setae or vegetative cells; division of suffultory cell basal; oospore wall smooth; androsporangia scattered or subepigynous, 1—?; dwarf males on suffultory cells (rarely on oogonia), antheridia unicellular; vegetative cells 17-23 * 42-80; oogonia 48-54 X 45-52u; oospores 45-53 X 43-50u; androsporangia 14-17 X 10-15; dwarf male stipe 11-13 15-21y; antheridia 10-12 X 14—18y. Beeb OGmiAk TE 39 Bengal, Asia. 20. B. elachistandria Wittrock. (Pl. III, fig. 21.) 1874, p. 43; B. intermedia Pringsh. 1858, p. 72, Pl. IV, figs. 15-23; Hirn 1900, p. 342, Pl. LVI, fig. 354; Heering 1914, p. 231, fig. 354; Tiffany 1928, p. 141, PI. SeVAL, Hele Dioecious, nannandrous, gynandrosporous; oogonia globose, patent, below androsporangia; division of suffultory cell nearly median; oes Buse wall smooth (7); androsporangia epigynous or scattered, 1-2; dwarf males on oogonia, small and unicellular; vegetative cells 20-24 aie oogonia about 4644y; androsporangia 14-16X10-1lyu; dwarf males 9X 19u. Germany. 21. B. obliqua Lundell. (Pl. II, fig. 26.) In Hirn 1900, p. 344, Pl. LVI, fig. 356; Heering 1914, p. 238, fig. 371; Tiffany 1928, p. 141, Pl. XVI, fig. 26. Dioecious, nannandrous, gynandrosporous and idioandrosporous; oogonia depressed-globose, patent, below terminal setae or (rarely) androsporangia; division of suffultory cell median or nearly so; oospore wall smooth; androsporangia 1—?, epigynous; dwarf males on oogonia, antheridia interior; vegetative cells 21-27 X42-108u; oogonia 55-64 43—51u; oospores 53-62 40-49; androsporangia 16-21 7-10u; dwarf male stipes 9-10 X 25—36y; antheridia 10-12 15-21p. United States: Michigan; Austria, Sweden. 22. B. sessilis Wittrock. (Pl. III, fig. 19.) 1872, p. 18, Pl. 1, fig. 2; 1874, p. 47; Hirn 1900, p. 338, Pl. LV, fig. 349; Heering 1914, p. 236, fig. 366; Tiffany 1928, p. 141, Pl. XVI, fig. 19. Dioecious, nannandrous, gynandrosporous; oogonia subquad- rangularly globose, patent, below terminal setae or occasionally below vegetative cells; division of suffultory cell superior; outer oospore wall scrobiculate; androsporangia scattered, 1-3; dwarf males on oogonia or rarely suffultory cells, antheridia interior, pe a little curved, shorter than antheridia; vegetative cells 19-2238-72u; oogonia 51-56 X 44— 50; oospores 48- 04 X 42— —48u; eo. toe <0 pn: dwarf males 9-11 XK 26-29u. France, Sweden, Canada. 22a. Form glabra Hirn. (Pl. III, fig. 20.) 1900, p. 339, Pl. LV, fig. 350; Heering 1914, p. 236; Tiffany 1928, p. 141, Pl. XVI, fig. 20. Smaller, with oospore wall smooth; vegetative cells 16-21 X32-75y; oogonia 44—51 & 40—45y: oospores 42-48 & 38-43; androsporangia 10-12 X 10-124; dwarf males 9-11 K 23-27. Sweden. 40 HE. OE DOGONTACHE Ace 23. B. setigera (Roth) C. A. Agardh. (Pl. V, fig. 37.) 1817, p. 71; Conferva setigera Roth 1806, p. 283; B. setigera C. A. Agardh 1817, p. 71; Wittrock 1874, p. 47; (?) B. setigera var. Canbyit Wood in Wolle 1887, p. 99; (2?) B. Canbyit, Wood 1872, p. 202; Hirn 1900, p. 339, Pl. LV, fig. 351; Collins 1909, p. 271; Heering 1914, p. 236, fig. 367; Tiffany 1928, p. 142, Pl. XVIII, fig. 37. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed or depressed (quadrangularly) globose, patent, generally below terminal setae, more rarely below androsporangia or vegetative cells; division of suffultory cell slightly above median or rarely superior; outer oospore wall scrobiculate; androsporangia scattered or more rarely epigynous, 1-3; dwarf males on oogonia or near it; antheridia interior, stipe curved, shorter than antheridium; vegetative cells 25-2862-140yu; oogonia 70-80 X 56-654; oospores 67-77 X53-62y; androsporangia 16-20 10-184; dwarf males 11-14 *30-36u. United States: Connecticut, New Jersey, Florida, Alabama, South Carolina, Michigan; Europe, South America; Africa. 24. B. alabamensis Transeau and Brown. (Pl. V, fig. 38.) In Tiffany 1928, p. 142, Pl. XVIII, fig. 38. Dioecious, nannandrous, gynandrosporous; oogonia globose, depressed globose, or rarely angularly globose, patent; division of suffultory cells superior; outer spore wall scrobiculate; androsporangia hypogynous or epigynous or rarely scattered; dwarf males, a little shorter than oogonia, on vegetative cells, antheridia interior, stipe a little curved; vegetative cells 22-40 X 62-111; oogonia 77—92 X 70-88y; oospores 75-90 X68-86yu; dwarf male stipes 14-18 *35-38y; antheridia 14-15 X 15-16. United States: Alabama. In form and general appearance this species is near B. setigera. It is larger, however, in all dimensions and is thus the largest globose species of the genus. 25. B. dispar Wittrock. (Pl. II, fig. 23.) In Wittrock and Nordstedt Exs. 1882; Hirn 1900, p. 335, Pl. LIV, fig. 344; rotus 1909, p. 270; Heering 1914, p. 234, fig. 363; Tiffany 1928, p. 142, Pl. XVI, (2 Re Dioecious, nannandrous, gynandrosporous and idioandrosporous; oogonia subdepressed globose, patent, below terminal setae or rarely vegetative cells; division of suffultory cell superior (rarely submedian) ; outer spore wall thick, finely scrobiculate; androsporangia scattered, 1—2; dwarf males on oogonia, antheridia interior, stipe a little curved, shorter than antheridia; vegetative cells 16—21X32-95u; oogonia 44-56 X42-51lu; oospores 40-54X38-48u; androsporangia 12-16X 10-12u; dwarf males 9-11 *23-26un. Sweden, Greenland. BULBOCHA TE 41 25a. Var. ripartiana Wittrock. (Pl. II, figs. 24 and 25.) In Hirn 1900, p. 3385, Pl. LIV, fig. 345; Tiffany 1928, p. 148, Pl. XVI, figs. 24 and 25. Idioandrosporous; division of suffultory cell supreme; dwarf males on or near oogonia; vegetative cells 15-21 X45-105y; oogonia 48-54 x 41- 50u; oospores 46-53 X389-48u; androsporangia 12-16X11-14u; dwarf males 10-12 23—25un. France. 26. B. punctulata (Nordstedt) Hirn. (Pl. IV, fig. 31.) 1900, p. 326, Pl. LI, fig. 332; B. setigera (Roth) C. A. Agardh var. punctulata Nordstedt 1888, p. 9; Tiffany 1928, p. 143, Pl. XVII, fig. 31. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed globose, patent, below terminal setae or androsporangia, wall thickened, division median, narrow but distinct; division of suffultory cell superior; outer oospore wall scrobiculate; androsporangia epigynous, 1—?; dwarf males on oogonia, antheridia interior, stipe a little curved, shorter than the antheridium; vegetative cells 22—2666-104u; oogonia 64-68 x 57-604; oospores 60-66%X53-58u4; androsporangia 18X11lu; dwarf males 11-12 30-34u. New Zealand. 27. B. crassiuscula Nordstedt. (Pl. IV, figs. 28 and 29.) 1877, p. 30, Pl. 3, figs. 14 and 15; B. setigera (Roth) C. A. Agardh in Moebius 1894, p. 315; (?) B. ellipsospora West 1899, p. 54; Hirn 1900, p. 341, Pl. LV, fig. 352; Collins 1909, p. 271; Heering 1914, p. 236, fig. 368; Tiffany 1928, p. 148, Pl. XVII, figs. 28 and 29. Dioecious, nannandrous, idioandrosporous; oogonia depressed (sub- quadrangularly) globose, patent, below terminal setae or occasionally vegetative cells; division of suffultory cells superior (rarely submedian) ; outer oospore wall scrobiculate; androsporangia 1-4; dwarf males on oogonium or near it; antheridia interior, stipe slightly curved, shorter than antheridium; vegetative cells 22—2755-148u; oogonia 60-78 <50-62u; oospores 58-76 X48-60u; antheridia 16-19X10-13y; dwarf males 12-14*30-34u. United States: Illinois, Massachusetts, Michigan; Canada, Greenland, Europe, Australia, Ceylon. 28. B. crassa Pringsheim. (Pl. IV, fig. 32.) 1855, Pl. 1, fig. 29; Wittrock 1874, p. 48; Hirn 1900, p. 343, Pl. LVI, fig. 355; Heering 1914, p. 238, fig. 370; Tiffany 1928, p. 148, Pl. XVII, fig. 32. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed globose to globose, patent, below terminal setae or rarely vegetative cells; division of suffultory cell median or a little above; outer oospore wall scrobiculate; androsporangia scattered, up to 4-seriate; dwarf males a little longer than oogonia, antheridia exterior, unicellular, stipe about twice as long as antheridium; vegetative cells 22-26 K 44-60u; 42 ree, Or DiC GO NAC EAlun oogonia 52-60 X 42-51; oospores 50-58 X 40-48u; androsporangia 13-15 X 14-16; dwarf male stipes 9-11 32—44u; antheridia 8-9 X 21—24u. United States: Ohio; Germany, Austria, Switzerland. The outer oospore wall of this species is recorded by Hirn as doubtfully smooth. Material collected in Ohio in 1920 showed the wall to be scrobiculate, and the description is emended accordingly. 29. B. valida Wittrock. (Pl. IV, fig. 27.) 1872, p. 17, Pl. 1, fig. 1; 1874, p. 48; Hirn 1900, p. 346, Pl. LVI, fig. 357; Heering 1914, p. 238, fig. 372; Tiffany 1928, p. 144, Pl. XVII, fig. 27. Dioecious, nannandrous, gynandrosporous; oogonia depressed globose, patent, below terminal setae; division of suffultory cell about median; outer oospore wall scrobiculate; androsporangia scattered, 1-3; dwarf males on oogonia, antheridia interior, stipe a little longer than antheridium, curved; vegetative cells 23-2746-95u; oogonia 59-70 X48-56u; oospores 57-68X46-54u; androsporangia 18-20 10-144; dwarf male stipes 9-1023-29 (40) uw; antheridia 11-12 20—22 tu. United States: Michigan; Finland, Sweden. 30. B. quadrata Wittrock. (Pl. II, fig. 22.) 1872, p. 19, Pl. 1, fig. 3; 1874, p. 45; Hirn 1900, p. 338, Pl. LV, fig. 348; Heering 1914, p. 236, fig. 365; Tiffany 1928, p. 144, Pl. XVI, fig. 22. Dioecious, nannandrous, gynandrosporous; oogonia subdepressed (subquadrangularly) globose, patent, below androsporangia; division of suffultory cell inframedian (rarely nearly median); outer oospore wall scrobiculate; androsporangia 1—2, epigynous, rarely scattered; dwarf males on oogonia, antheridia interior, stipe a little curved, shorter than antheridium; vegetative cells 19-25 30-50u; oogonia 40-50 40—45y; oospores 38-48 X38—48u; androsporangia 15-17 X11—12u; dwarf males LO=I2> 27 S20. United States: Ohio; Finland, Sweden. 31. B. congener Hirn. (Pl. V, figs. 33 and 34.) 1900, p. 346, Pl. LVII, fig. 358; Tiffany 1926, p. 108, Pl. X, figs. 111 and 112; Tiffany 1928, p. 144, Pl. XVIII, figs. 33 and 34. Dioecious, nannandrous, idioandrosporous; oogonia depressed- globose or more rarely oboviform-globose, patent, below terminal setae; division of suffultory cell inframedian; outer oospore wall scrobiculate; androsporangia 1-4; dwarf males a little shorter than the oovonia on which they develop; antheridia interior, stipe about twice as long as the antheridial cell, curved; vegetative cells 21-2440-75y; oogonia 44-54 X 40-48; oospores 42-52 * 38-46; androsporangial cells 13-15 X 10-131; dwarf males 9-10 K 29-34; antheridial cells 10-11 X 14-17u. United States: Iowa; South America. MUL BOC HA ET E 43 32. B. pyrulum Lundell. (Pl. IV, fig. 30.) In Hirn 1900, p. 342, Pl. LV and LVI, fig. 3538; Heering 1914, p. 288, fig. 369; Tiffany 1928, p. 145, Pl. XVII, fig. 30. Dioecious, nannandrous, (?) idioandrosporous; oogonium pyriform, patent, below terminai setae, wall thickened; division of suffultory cells submedian; outer oospore wall finely scrobiculate; dwarf males near or on oogonia, antheridia interior, stipe a little curved, shorter than antheridium: vegetative cells 23-29X64-178u; oogonia (58-) 68-85 X 64-79"; oospores 65-83 61-774; dwarf males 11-14 29-33u. Austria, Sweden, Finland. 33. B. doliiformis Borge. (Pl. VI, figs. 39 and 40.) 1925, p. 11, Pl. 1, fig. 41; Tiffany 1928, p. 145, Pl. XIX, figs. 39 and 40. Dioecious, nannandrous; oogonia ellipsoid, erect, below terminal setae; suffultory cell without division; oospores ellipsoid, not quite filling oogonia, wall smooth; dwarf males on vegetative cells, antheridia exterior, 2; vegetative cells 11-15X11-16u; oogonia 23-25 X 26-33; oospores 22—23 X27-28u; dwarf male stipe 10-12X10-12y; antheridia 7-8 X 7-8. Argentina: This species is near B. pygmaea in size and shape of cells and in having suffultory cells without division. The plant is few celled with the vegetative cells convex, as seen laterally, sometimes with a broad median constriction, and the oospore wall is smooth. 34. B. pygmaea Pringsheim; Wittrock. (Pl. VI, fig. 41.) In Wittrock 1870, p. 141; B. pygmaea b. minor Pringsh. 1858, p. 74; B. pygmaea Wittr. 1870, p. 141; Wittrock 1874, p. 52; Hirn 1900, p. 356, Pl. LIX, fig. 372; Collins 1909, p. 273; Heering 1914, p. 239, fig. 374; Tiffany 1928, p. 145, Pl. XIX, fig. 41. Dioecious, nannandrous, gynandrosporous; oogonia ellipsoid, patent, below terminal setae or vegetative cells; outer wall of oospore longi- tudinally ribbed; suffultory cells without division; androsporangia subepigynous or scattered, I—? celled; dwarf males near oogonia, antheridia exterior, 1-3; vegetative cells 11-15 X8—15y; oogonia 22-25 X 32-40u; oospores 20-23X30-38u; androsporangia 7-106-9u; dwarf male stipes 11-12 15-19; antheridia 7-8 X 7-8u. United States: Massachusetts; Europe, Brazil. 35. B. tenuis (Wittrock) Hirn. (Pl. VII, fig. 59.) 1900, p. 368, Pl. LXIII, fig. 388; B. rectangularis Wittr. var. tenuis Wittr. 1874, p. 56; B. rectangularis Wittr. var. norvegica Wittr. 1874, p. 56; B. tenuis (Wittr.) Hirn var. norvegica (Wittr.) Hirn 1900, p. 369 (not 1906, p. 60); Collins 1912, p. 89; Heering 1914, p. 242, fig. 381; Tiffany 1928, p. 146, Pl. XX, fig. 59. 44 eH Ee OSE DIO'GO NTA GE Ase Dioecious, nannandrous, gynandrosporous; oogonia suboblong- ellipsoid, erect or patent, below terminal setae or androsporangia; outer oospore wall longitudinally ribbed; androsporangia epigynous or more rarely scattered, 1-7; dwarf males on or near oogonia; antheridia exterior, 1-3; vegetative cells 13-16 X20-40u; oogonia 22-26 K 42-48; oospores 20-2440-46u; androsporangia 10-12*13-19u; dwarf male stipes 12-14 18—24u; antheridia 7-9 X 6—7u. United States: Massachusetts; Northern Europe. doa. Var. norvegica (Wittrock) Hirn. (Pl. VII, fig. 60.) 1906, p. 60; Tiffany 1928, p. 146, Pl. XX, fig. 60. Larger vegetative cells and oogonia; vegetative cells 15-18 X 22-36u; oogonia 27-34X47-53u; oospores 25-3245-51u; dwarf male stipes 12-14 19-23u; antheridia 8-9 8p. Finland. The dimensions of the variety norvegica as given by Hirn in his monograph (1900, p. 369) are so nearly the same as those of the species proper as to make its varietal position scarcely tenable. Material collected by Silfvenius in Finland in 1903 is labelled variety norvegica by Hirn (1906) having the dimen- sions given above. It seems best, therefore, to consider the variety as having the dimensions as recorded for the Finnish material, and to regard the former description as included in the Species proper. 36. B. repanda Wittrock. (Pl. VI, fig. 47.) 1874, p. 55; B. rectangularis Wittr. var. Lundellii Wittr. 1874, p. 56; (?) B. rhadinospora Wittr. in Wolle 1887, p. 103; Hirn 1900, p. 363, Pl. LXI, fig. 380; Collins 1909, p. 274; Heering 1914, p. 240, fig. 378; Tiffany 1928, p. 146, PI XIX, fig. 47. Dioecious, nannandrous, gynandrosporous; oogonia suboblong- ellipsoid, patent or erect, below androsporangia, terminal setae, or vegetative cells; outer oospore wall longitudinally ribbed; andro- sporangia epigynous or subepigynous, 1—’; dwarf males near or on oogonia; antheridia exterior, 1-3; vegetative cells, frequently repand, 12-17 X 24-604; oogonia 26-36X43-58u4; oospores 21-33X40-50y; androsporangia 13-15<16—21u; dwarf male stipes 11—15x21-27,; antheridia 7-10 X5—7u. United States: Massachusetts, Maine, New Jersey, Florida; Greenland, Finland, Norway, Sweden, Germany. The peculiar repand appearance of the vegetative cells usually makes the identification of this species easy. | Occasion- ally a single plant may lack this vegetative character and may thus be confused with B. rectangularis or B. varians. BULBOCH AE TE 45 37. B. rectangularis Wittrock. (Pl. VI, fig. 43.) 1870, p.-142; 1874, p. 55; (?) B. ignota Wood 1872, p. 201; Hirn 1900, p. 359, Pl. LX, fig. 376; Collins 1909, p. 273; Heering 1914, p. 239, fig. 376; Tiffany 1928, Dela (aeP le exe he 45 PB. AL No:-5o16: Dioecious, nannandrous, gynandrosporous; oogonia ellipsoid, patent or more rarely erect, below terminal setae or androsporangia or more rarely vegetative cells; outer oospore wall! longitudinally ribbed; andro- sporangia scattered or epigynous, 1—?; dwarf males near or occasionally on oogonia; antheridia exterior, 1-4; vegetative cells, subrectangular in cross section, 16-23 X 20-46u; oogonia 32-39 X 45-63; oospores 29-37 X 43-61u; androsporangia 13-16X10-27u4; dwarf male stipes 14-18 22-27; antheridia 8-10 X5-7u. United States: Pennsylvania, Ohio, Illinois, Michigan, Massachusetts, Rhode Island, Connecticut; Europe, Patagonia, Mongolia. This species is usually characterized by its long and few branches and its nearly rectangular cells in cross section. 37a. Var. hiloensis Nordstedt. (Pl. VI, fig. 44.) 1878, p. 22; Hirn 1900, p. 361, Pl. LX, fig. 377; Collins 1909, p. 274; Tiffany 1928, p. 147, Pl. XIX, fig. 44. Smaller, androsporangia generally epigynous; vegetative cells 14-19 X 2448y; oogonia 28-32 X 47-51; androsporangia 12-14 XK 13-16y; dwarf male stipes 13-14 22—24u; antheridia 8-9 x 5-7u. Australia; (?) Pennsylvania (U.S. A.). The only American record is that of Wolle. 38. B. varians Wittrock. (Pl. VI, fig. 48.) 1870, p. 143; 1874, p.53; Hirn 1900, p. 357, Pl. LIX, fig. 373; Heering 1914, p. 239, fig. 375; Tiffany 1926, p. 109, Pl. X, fig. 113; Tiffany 1928, p. 147, Pl. XIX, fig. 48. Dioecious, nannandrous, gynandrosporous; oogonia ovoid, patent or erect, below terminal setae or below androsporangial cells; outer oospore wall longitudinally ribbed, ribs serrate; androsporangia scattered, epigynous or hypogynous, 1—2; dwarf males on or near the oogonia, antheridia exterior, 1-3; vegetative cells 17-2222-33u; oogonia 30-36 X 44-54; oospores 28-34 X42-52u; androsporangial cells 14-17 X 14-18; dwarf male stipes 14-16 X 24—27y; antheridial cells 8-10 X 6—7u. United States: Iowa, Ohio, Illinois, Michigan, Alabama, Mississippi, Indiana; Canada, Europe. 38a. Var. subsimplex (Wittrock) Hirn. (Pl. VI, fig. 49.) 1900, p. 357, Pl. LIX and LX, fig. 374; B. pygmaea a. major Pringsh. 1858, p. 74; B. subsimplex Wittr. 1870, p. 142; 1874, p. 52; B. varians Wittr. var. alpina Wittr. and Lund. im Wittrock 1874, p. 53; B. dumosa Wood 1872, p. 202; B. reticulata Nordst. var. minor Lemmermann 1895, p. 25; Collins 1909, p. 273; Heering 1914, p. 239; Tiffany 1926, p. 110; 1928, p. 147, Pl. XIX, fig. 49. 46 Me Ome GoOntLA GE Aw Smaller in nearly all parts; ribs of oospore serrulate or smooth; vegetative cells 13-18X16-34y; oogonia 26-30X39-46u; oospores 24-28 X37-44u; androsporangial cells 10-14X7—-l6u; dwarf male stipes 11-14 15—24y; antheridial cells 7-8 X5-7p. United States: Iowa, Ohio, Mississippi, Illinois, Pennsyl- vania; Brazil, India, Europe, Australia; British Columbia. 38b. Var. hawaiensis Nordstedt. (Pl. VI, fig. 50.) P sae p. 21; Hirn 1900, p. 358, Pl. LX, fig. 375; Tiffany 1928, p. 148, Pl. XIX, 2g. * Vegetative cells 13-18X17-36y4; oogonia 27-3044-54y; andro- sporangia 12-16 13-14; dwarf male stipes 17-18 X 28-31y; antheridia 10-11 X 6-7. United States: Ohio, Illinois; Australia. 39. B. lagoensis Wittrock. (Pl. VI, fig. 46.) 4 me p. 53; Hirn 1900, p. 361, Pl. LXI, fig. 378; Tiffany 1928, p. 148, Pl. XIX, 2g. 4 Dioecious, nannandrous; oogonia ellipsoid, erect or rarely patent, below vegetative cells; outer oospore wall longitudinally ribbed, the ribs dentate and connected by transverse lines; dwarf males near oogonia; antheridia exterior, 1-2; vegetative cells 18-2323-35y; oogonia 37-41 X 56-634; oospores 35-39X54-61u; dwarf male stipes 15-17 X 24-25; antheridia 9-10 7-8u. Brazil. 40. B. rhadinospora Wittrock. (Pl. VIII, fig. 66.) 1874, p. 538; Hirn 1900, p. 372, Pl. LXIII and LXIV, fig. 393; Heering 1914, p. 242, fig. 383; Tiffany 1928, p. 148, Pl. XXI, fig. 66. Dioecious, nannandrous, gynandrosporous; oogonia fusiformly ellipsoid, patent or rarely erect, below androsporangia or terminal setae or rarely vegetative cells; outer wall of oospore longitudinally ribbed, ribs smooth; androsporangia epigynous or rarely scattered, 1—?; dwarf males on or near oogonia; antheridia exterior, 1-4; vegetative cells 15-22 20-44; oogonia 29-37 X61—80u; oospores 27-35 X 59-78; androsporangia 13-17X16-23u; dwarf male stipes 13-16X23-25p; antheridia 7-9 X6-S8u. Sweden. 40a. Forma antiqua (Nordstedt) Hirn. (Pl. VIII, fig. 67.) 1900, p. 372, Pl. LXIV, fig. 394; Nordstedt 1883, p. 154; B. varians Wittr. var. antiqua Nordstedt im Borge 1896, p. 4; Tiffany 1928, p. 148, Pl. X XI, fig. 67. Ribs of oospore crenulate; vegetative cells 15-21 X20-42u; oogonia 32-37 X58-78u; oospores 30-35%X56-764; androsporangia 15-18X 23-26u; dwarf male stipes 14-17 X 23-26y; antheridia 9-11 X6-10y. Australia. Bailes Oe HAon tT E 47 40b. Var. litoralis Hirn. (Pl. VIII, fig. 68.) 1900, p. 373, Pl. LXIV, fig. 395; Tiffany 1928, p. 149, Pl. X XI, fig. 68. Larger; vegetative cells 22-28X28-56u; oogonia 38-45 75-87; oospores 36-43 73-85y; androsporangia 17-20 18-20u; dwarf male stipes 15-17 X 28-30; antheridia 9-13 X6—9u. Sweden. This variety is the only Bulbochaete known to inhabit brackish waters. 41. B. minor Al. Braun. (Pl. VI, fig. 54.) In Kuetzing 1849, p. 422; Wittrock 1874, p. 54; Hirn 1900, p. 369, Pl. LXIII, fig. 390; Collins 1909, p. 275; Heering, p. 242; Tiffany 1926, Pl. X, fig. 114; 1928, p. 149, Pl. XX, fig. 54. Dioecious, nannandrous, gynandrosporous; oogonia ovoid, erect or rarely patent, below terminal setae, androsporangial cells, or more rarely vegetative cells; outer oospore wall longitudinally ribbed; andro- sporangia epigynous, subepigynous, or scattered, 1-7; dwarf males on or near oogonia; antheridium exterior, 1-4; vegetative cells 18-25 X 27-50p; oogonia 32-42 X 59-694; oospores 30— 40X 1-67; prices fee 15—16 X 16-214; dwarf male stipes 12-15 X 22-24u; antheridia 6-10 X 6—7u. United States: Iowa, Indiana, Illinois, New Jersey; Ger- many, Sweden, Austria, England. 41a. Var. germanica Hirn. (Pl. VI, fig. 55.) 1900, p. 370, Pl. LXIII, fig. 391; (?) B. mimor Al. Br. in De Bary 1854, p. 72; B. minor Al. Br. in Pringsheim 1858, p. 74; Heering 1914, p. 242, fig. 382; Tiffany 1928, p. 149, Pl. XX, fig. 55. Vegetative cells 15-22 23-56u; oogonia 30-35 X 56-65; oospores 28-33 X 54-63; dwarf male stipes 10-1221-24uy; antheridia 6-9 X 6-7. Germany. This variety on the basis of dimensions and habit seems scarcely tenable. I have not been able to examine the original material, however, and have followed Hirn’s disposition of it. 42. B. bullardi Transeau and Tiffany. (Pl. VII, figs. 52 and 53.) 1919, p. 241, Pl. XIV, figs. a-e; Tiffany 1928, p. 149, Pl. XX, figs. 52 and 53. Dioecious, nannandrous, idioandrosporous; oogonia ‘ovoid-ellipsoid or ellipsoid, erect, terminated by long setae, pore evident and supra- median; oospores filling or nearly filling oogonia, ribs of outer wall of oospore dentate, the teeth connected by transverse lines, longitudinal ribs uniting irregularly; androsporangia 1-6; dwarf males slightly curved, on oogonia or suffultory cells or vegetative cells; antheridia exterior, 1-3; vegetative cells 20-32 X 60—-165y; oogonia 56-66 XK 70-96y; 48 tT HE O-E DOiGONIMe Eee oospores 54-64% 67-94; androsporangia 18-21 15-334; dwarf male stipes 18-21 X30-33y; antheridia 9-14 X 6—-10y. United States: Massachusetts. The combination of dimensions and oospore markings rather readily separates this species from B. imperialis and B. insignis, its nearest relatives. 43. B.denticulata Wittrock. (Pl. VI, fig. 51.) 1874, p. 54; Hirn 1900, p. 362, Pl. LXI, fig. 379; Heering 1914, p. 240, fig. 377; Tiffany 1928, p. 150, Pl. XIX, fig. 51. Dioecious, nannandrous; oogonia broadly ellipsoid, patent, below terminal setae or rarely vegetative cells; outer oospore wall longitudinally ribbed, ribs often anastomosing; dwarf males on or near oogonia; antheridia exterior, 1-2; vegetative cells 27-3034-45u; oogonia 48-54 X69-76u; oospores 46-5267—74y; dwarf male stipes 18-21 X 30-31; antheridia 13-14X8-10y. Norway. 44. B. affinis Hirn. (Pl. VU, fig. 61.) 1900, p. 371, Pl. LXIII, fig. 392; B. minor Al. Br. in Borge 1896, p. 4; Tiffany 1928, p. 150, Pl. XX, fig. 61. Dioecious, nannandrous, gynandrosporous; oogonia suboblong- ellipsoid to ellipsoid, patent or rarely erect, below terminal setae or androsporangia; outer oospore wall longitudinally ribbed, andro- sporangia epigynous, 1—’; dwarf males near or on oogonia, antheridia exterior, 1-3; vegetative cells 22-27X27-47u; oogonia 40-46 X 67-78y; oospores 38-44% 65-76u; androsporangia 18-19 23-30u; dwarf male stipes 17-19 X 22-28; antheridia 9-12 KX 9-13y. Australia. 45. B.anomala Pringsheim. (Pl. VI, fig. 45.) 1858, p. 73, Pl. 6, fig. 6; Wittrock 1874, p. 56; Hirn 1900, p. 366, Pl. LXII, fig. 385; Heering 1914, p. 240, fig. 380; Tiffany 1928, p. 150, Pl. XIX, fig. 45. Dioecious, nannandrous; oogonia ellipsoid, erect, below vegetative cells; dwarf males near oogonia; antheridia exterior, 1-2; vegetative cells 26-27 X52-54y; oogonia 49-51 X75-80u; oospores 47-48 X 73-78y; dwarf male stipes 18X37; antheridia 13 X 13y. Germany. 46. B. insignis Pringsheim. (Pl. VIII, fig. 62.) : 1858, p. 73, Pl. 6, fig. 7; (2) B. pringsheimiana Archer 1866, p. 121; B. speciosa Wittr. 1870, p. 143; Wittrock 1874, p. 55; (?) B. pachyderma Reinsch 1875, p. 82; (?) B. anomala Pringsheim in Nordstedt 1888, p. 8; Hirn 1900, p. 364, Pl. LXII, fig. 383; Collins 1909, p. 274; Heering 1914, p. 240, fig. 379; Tiffany 1928, p. 150, Pl. X XI, fig. 62; P. B. A. Nos. 1332 and 14380. Dioecious, nannandrous, gynandrosporous; oogonia ellipsoid, erect or patent, below androsporangia or terminal setae or vegetative cells; oospores ellipsoid with broadly denticulate longitudinal ribs on the BwLbeocHArT E 49 outer oospore wal!; androsporangia epigynous or scattered, 1-7; dwarf - males near or on oogonia; antheridia exterior, 1-3; vegetative cells 19-25 X48-88u; oogonia 46-56X70-90u4; oospores 44-54 68-88u; androsporangia 16-20X9-25u4; dwarf male stipes 16-1929-33u; antheridia 10-13 X 7—10u. United States: Massachusetts, Michigan, Illinois, New York, New Jersey, Alaska; Europe, Australia. 46a. Var. reticulata (Nordstedt) Hirn. (Pl. VIII, fig. 63.) 1900, p. 365, Pl. LXII, fig. 384; B. reticulata Nordst. 1877, p. 32; Collins 1909, p. 275; Tiffany 1928, p. 151, Pl. XXI, fig. 63. Outer wall of oospore reticulate-dentate, with doubly dentate, occasionally anastomosing, longitudinal ridges, the teeth united to each other by transverse ridges; vegetative cells 20-25 X 40-87; oogonia 44-52 X66-85y; oospores 42-50X64-83u; androsporangia 16-19 13—23u; dwarf male stipes 17-20 X 30-33u; antheridia 11-13 x 6-9u. United States: Massachusetts, Illinois; Sweden, Denmark. 47. B. imperialis Wittrock. (Pl. VIII, fig. 64.) ‘ ao p. 54; Hirn 1900, p. 367, Pl. LXII, fig. 386; Tiffany 1928, p. 151, Pl. XXI, g. 64. Dioecious, nannandrous, gynandrosporous; oogonia broadly ellipsoid, erect, terminated by setae; outer oospore wall longitudinally ribbed, the ribs irregularly anastomosing or connected by transverse ribs; andro- sporangia scattered, 1-7; dwarf males on or near oogonia; antheridia exterior, 1-2 celled; vegetative cells 26-31 X32-106y; oogonia 81-83 104-1084; oospores 79-81 X 102-1064; androsporangia 18-20 25-26; dwarf male stipes 19-21 X30-35u; antheridia 13-16 X 7-9u. Brazil. 47a. Var. regalis Wittrock. (Pl. VII, fig. 65.) 1874, p. 55; Hirn 1900, p. 367, Pl. LXII, fig. 387; Tiffany 1928, p. 151, Pl. XXI, fig. 65. Smaller than the type; vegetative cells 24-26X72-117u; oogonia 68-70 X88-90u; dwarf male stipe 2039u; antheridia 15-16 6—7u. Brazil. 48. B. spirogranulata West and West. (Pl. VII, figs. 57 and 58.) 1902, p. 126, Pl. 17, figs. 8 and 9; Hirn 1906, p. 27, Pl. IV, fig. 29. Oogonia oblong-ellipsoid, subpatent; outer wall of oospore thick with longitudinal, crenulate ribs; androsporangia scattered; suffultory cells without division; setae long; vegetative cells, spirally granulate, 9-12 31-57; oogonia 20-24 KX 48-49u; androsporangia 7-8 X 9-10. Heneratgodha, Ceylon. 50 THE: OEFEDOGONTACEAE The vegetative cells of this species are minutely granulate, with the markings spirally arranged. This character is rather unique among the ellipsoid members of the genus. 49. B. brevifulta Wittrock. (Pl. VII, fig. 56.) pa ae p. 57; Hirn 1900, p. 373, Pl. LXI, fig. 382; Tiffany 1928, p. 152, Pl XX, Oogonia broadly ellipsoid, erect, terminated by setae; oospores with outer wall longitudinally and irregularly ribbed; vegetative cells 19-24 X38-72u; oogonia 34-42 %50-56u; oospores 32-40 X 48-54u. Brazil. This description is quite incomplete and the position of the species must be considered temporary until more data can be secured. 50. B. sanguinea Hansgirg. 1905, p. 437; Hirn 1906, p. 26; Heering 1914, p. 242; Tiffany 1928, p. 152. Few celled and little branched; cell walls 2—3u thick; vegetative cells 26-35 X 24-50u, with contents blood-red in color; reproductive cells unknown. Austria. Hansgirg gives no figures for this interesting form, but compares it in habit with B. minor. A somewhat similar species, B. purpurea Corda (Hansgirg loc. cit.) with purple-red vegetative cells alternating with colorless empty cells, was described from Bohemia. Cleve (1895) also observed a red Bulbochaete, collected in October, 1894. Until more is known of the reproductive structures of these forms, their specific position must be merely a provisional record. 51. B. horrida Nordstedt. (Pl. VI, fig. 42.) In Hirn 1900, p. 355, Pl. LIX, fig. 371; Tiffany 1928, p. 152, Pl. XIX, fig. 42. Dioecious, nannandrous; vegetative cells medianly plicate; oogonia ellipsoid; antheridia of dwarf males 1—’; vegetative cells 16-25 X 12-25; basal cells 17-20 10—20uz. South America. Little is known of the reproduction’ of this interesting species, and figures are available only for the vegetative cells. The median plications of the latter, however, readily separate it from any other species of the genus known at the present time. Hirn’s record of Lagerheim’s collections in the Guianas in which dwarf males and ellipsoid oogonia were seen is our only information regarding the fructification of the species. OEDOCLADIUM 51 Genus II. Oecedocladium Stahl. 1891, p. 339; Hirn 1900, p. 374; Collins 1918, p. 71; Lewis 1930. Terrestrial or aquatic, branching, rhizoidal; if terrestrial, partly subterranean and subhyaline, partly above ground and green; vegetative cell cylindrical or nearly so, growth chiefly by division of terminal cell of a filament or branch; asexual reproduction by “‘akinete”’ and zoospore; oogonium arising by a simple division of a vegetative cell; sexual reproduction both monoecious and dioecious, nannandrous. KEY TO THE SPECIES OF OEDOCLADIUM. 0 OLE SEVGIES. 6 SESS e 2 ee ee Pe PUNOCHOUS nannandrous, aAguatiCunse settles ancient es -~? 4. O. hazenii SSE PENTA) AG PR ee ia a ge RS ee ee a 3 Le QUEST PGS) SS VRS DS a Se ei ak ee 4 SME RECAUIVCNCElLE/ ZUM eee <5 re cle aus, fe si olen) | EELS + pda aeada ee 1. O. protonema 3. Vegetative cell 12-18 X56-78u.................. oa RY ee Le 3. O. media FRO OLOMMIM OS OOM rane ciclo eho ethos es oye. ede. 3. O. media PO) SOIT FU COOL I aerate cidiass t's Sees arcis ss Lee 2. O. albemarlensis 1. O. protonema Stahl. (Pl. LXIII, figs. 619-623.) 1891, p. 347, Pl. XVI, figs. 1-6, Pl. XVII, figs. 1-12; Hirn 1900, p. 374, Pl. LXIV, fig. 396. Monoecious; oogonium single, subglobose, rarely terminal, pore median; oospore globose, filling oogonium, spore wall smooth; anther- idium scattered, 1-6; vegetative cell 7X20u, rhizoidal 3X (up to)300u; oogonium 50-76 X 58-76; oospore 45-60 X 45-60y. Germany (Strassburg). 2. O. albemarlensis Lewis. (Pl. LXIII, figs. 613-617.) In Collins (as O. albemarlense Lewis) 1918, p. 71, Pl. III, figs. 22a and 22b. Monoecious; oogonium single, mostly terminal, subglobose with conical apex (if terminal), pore inferior; oospore globose, not filling oogonium, spore wall of three layers: outer layer smooth, middle layer angulate (in optical section undulate), inner layer smooth; antheridium to 9; vegetative cell subcylindrical; terminal cell with conical apex; vegetative cell 25-40 X50-150y, rhizoidal 4-10 X (up to)350u; oogonium 90 X95; oospore 69 X 69u; antheridium 20-25 X 8-19; zoospore 32-50y. United States: Virginia (on sandy loam, bank of the Rivanna, near Charlottesville, Albemarle County) growing with Vaucheria and Riccia. Collected by Professor I. F. Lewis. 52 Pint © PpoGe on wAcE AE 3. O. media Lewis nov. sp. mss. (Pl. LXI, figs. 601-603.) Monoecious; oogonium single, mostly terminal, globose to sub- globose, with conical apex (if terminal), pore median; oospore globose, not quite filling oogonium, spore wall with middle layer angulate or smooth; antheridium 1-2; terminal cell with conical apex; vegetative cell 12-18X56-78u, rhizoidal 10X(up to)270u; oogonium 52X52y; oospore 44 44u; antheridium 15 9-15y. United States: Massachusetts (Woods Hole). Collected by Professor I. F. Lewis. 4. QO. hazenii Lewis nov. sp. mss. (Pl. LXII, figs. 604-612.) Dioecious, nannandrous, gynandrosporous; oogonium globose to subglobose, terminal or intercalary, pore inferior; oospore globose, not or nearly filling oogonium, spore wall with middle layer angulate; androsporangium 1-2, epigvnous, subepigynous, or scattered; dwarf male curved or erect, on suffultory cell-or more rarely on oogonium; antheridium exterior, single; vegetative cell 15-26X47-132u, rhizoidal 4X(up to)425u; oogonium 50-75 50-75u; oospore 45-55 45-55; androsporangium 16X7—12u; dwarf male stipe 18-22 7-10u; anther- idium 6-8 X 6-7u. United States: New Jersey. Collected by Professor T. E. Hazen. O. hazenii is the only dioecious, nannandrous species of the genus as well as the enly aquatic member, so far recorded. Data for descriptions and plates of Oedocladium media and O. hazenit were supplied by Professor I. F. Lewis of the Uni- versity of Virginia. Lewis’ O. hazenit makes it necessary to emend Stahl’s original description of the genus to include this nannandrous species growing in an aquatic habitat. OEDOGONIUM 53 Genus III. Oedogonium Link. 1820, p. 5; Pringsheim 1858, p. 68; Wittrock 1874, p. 6; Hirn 1900, p. 72; Collins 1909, p. 223; Prolifera Vaucher 1803, p. 14;, Vesiculifera Hassall 1845, p. 195; Cymatonema Kuetzing 1849, p. 375; Androgynia Wood 1872, p. 196; Pringsheimia Wood 1872, p. 195; Conferva (early authors). Filaments single, unbranched; vegetative cells cylindrical, or some- times capitellate, nodulose or undulate; basal cell with holdfast; terminal cell obtuse, apiculate, or hyaline; all vegetative cells, except the basal one, capable of division; oogonia and antheridia produced by direct division of vegetative cells. KEY TO THE SPECIES, VARIETIES, AND FORMS OF OEDOGONIUM ievecetative cellsundulate ormodulose... 9.28.58 0 egos. esac dns cne dan: 2 iran eetdiie Cellupunetate Or Sranulate: |.) wens edelein odie. sce bebses 6 ieee Veceratmvercellidistinetiyscapitellate....45-esn ..«sseeeeidedses onesceen. 7 PeVieserabivercelllieygimdrCalinen ) vers cok Hannes en . | eee nce owes asc 35 1. Vegetative cell subhexagonal or subellipsoid....... 236. O68. reinschii* aso Wh a OCC ENTS 2 0 6600 (2, Lo ys 3 Ps Aaa mye hyoligle sane eh ee ee GR pL Vic Se 4 Se Diameter ot oogonium IS—23u... 0424... 26 osc ue gees 105. Oc. sphaerandrium 3. Diameter of oogonium 48-57. -..............---:- 96. Oc. nodulosum 3. Diameter of oogonium 64-74u......... 96a. Oe. nodulosum var. commune Ae Diametermowoogonianml 44-0644... -....-anneneo ate. Ser sceose.: 4. Diameter of oogonium 58-68u...119a. Oe. undulatum var. americanum 5. Dwarf male 36—46u in length.......... 119b. Oe. undulatum f. senegalense ee Owanrhamale A8—/Owanlengthess. 4.0 4..<..22:1s40ee- 119. Oc. undulatum 6. Diameter of vegetative cell 6-Su............ 155. Oe. elegans 6. Diameter of vegetative cell 9-13u........... 84. Oc. minus 6. Diameter of vegetative cell 16-22u.......... 85. Oc. punctatostriatum A, Wiftitlvonnr Chine Toi Ra een 5 cme oN eneU an tk ee re rr 8 NH ME Glvyaislptincll ag Ae PRT ee Staves sank h a eee «koe kG eis ote he Ba irae Gone 17 ieee eproductive structures impertectly known... 0.3... 0. cc kee dee eens 34 Bi, DROVES SS o cre a ae cece a MERIT © ete ec Sen a an eee 9 SEE MOTOR CIOS are WR r at Saker, tattrn wiarinc in. an 5 sashes voto ale: «tae oe 11 PEO it1O Ol COPONITIMDASAL Jo. 6 lig gis he ees ss ss 78. Oe. infimum 9. Division of oogonium inferior........ 1s a eee 77. Oe. inversum Cee Dvr OMeOrOoOZOniuimapmolediaines.t0. sm sy ctlens asco aes cae eee cv a owteee sos 10 9. Division of oogonium supramedian or superior..... 89. Oe..mitratum — 10. Oogonium 26-29u in diameter... 79a. Oe. howardii var. minus 10. Oogonium 29-32u in diameter............... 79. Oc. howard 10. Oogonium 32-36 in diameter............... 81. Oe. latiusculum 11. Oogonium opening by a pore.......... 20a. Oe. hirnii var. africanum PME Ott mOMenim Vea LG oro. oc bese bene cme dist eee deanna saide as 12 ee OiaimeLvemomoo soni LOZ. 5. ooctsice a oe ceases vce ed one eM Eas 13 Zee Dice terOMmOOP ONT O4—4 Ou . sis 5 cede aes som on weds 6 ows eee 16 Lee Div tSIOf OMOOLONiMl MECIAME. 5 .ccce cmos Seb neu sngued ovo osiee es ehee ble 14 eee mAMOn OL COSI SUPLAMEeCIAN.:....... 56 eg een dence eea tees eine cee’ 15 14. Oogonium subdepressed-globose............. 86. O8c. capitellatum 145 Oorontum-angular-globose............5.-.-- 87. O8c. quadratum id= Msameterioft oogonttum 15=20n.......... 065.2050 55 210. Oc. virceburgense* ise Osameter of oogonia, I8—Bap.. 2... ne cn ee es es 105. Oc. sphaerandrium jee Oirameter, Of OOSOMilM 2O-2ou.... .- ns. cess se ee oe 211. Oe. spurium* *Species so marked have incomplete descriptions and are included in what is perhaps their probable position in the genus, using such characters as are available. o4 17. THE OF D OCONEACG EAE 1G” Viecetativercell punctatesse 4.5 eee cna 84. Oe. minus 163) Vegetativercell not punctaresassen eee aoe 88. Oc. bohemicum Porteous ...5.o 5a Oe eee 120. Oe. nebraskense Operculate sia.ces ces iiacc Oren Ieee eee Re IE ee cen ee ee 18 18 Divisionjohooconitmmimnediangae mee eee 19 18:, Divisioniol oogoniumistipramediant 5.) 7.602 oan nie 24 1852) Division omoozonium aininamediansns-rri en ese oe nee eeee 26 18. Division of oogonium superior.............. 156. O8c. rigidum 185 {Divisioniok oogomilimysupreme: sneer eee eee eee 29 Divisioniof oogonitimmarkowee sot eee Ee cee 20 Divasionvolsooroniumwidensa peek caeioe cee SEU cee eee eee 21 20. Oogonium 28-35 X 28-38u....... 17la. Oe. decipiens f. dissimile 20. Oogonium 46-54 X 44-54u...................157. Oe. bengalense 20°) Oogoniumrbs7—64 GAS 53 eee ee 158. O8¢. indicum ° Diameter. of oospore: 22-261 neso sec eeoe ee On e eee 22 Diameter of oospore 30-32u........... 160b. Oe. areschougi {. robustum Diameter of oospore 42-4807 — a=. 3. hee ee eer eee 23 Wiametemot oospore4s—oamase aici 159. Oe. brasiliense 22.) eyymanGdrOSpOrOUusic..stiss aa renee ee eee 160. Oc. areschougu 22 idioandTrospOorouses.ssse7 aoe 160a. Oe. areschougit var. americanum Vegetative cell 14-19u in diameter................ 157. Oc. bengalense Vegetative cell 19-26u in diameter................ 161. Oc. confertum 24. Diameter of oogonium 14-26yu............... 163. Oc. clavatum 24> Diameter omooronium 27-4244. + eee eee eer 25 24. Diameter of oogonium 50-55u............... 173. Oc. costatum 24. Diameter of oogonium 58-65u............... 174. Oe. boreale Oogonium 19-25u in length............ 164a. Oc. oelandicum {. minus Ooronitumy 25-527 intlengtheses sn. eee ae 164. Oc. oelandicum Oogonitum 40-45, in) lengthier ee eee 165. Oc. megaporum 26. Suffultory cell enlarged......... 167b. Oe. platygynum var. continuum 265 Suttittory. cell notaenlarced: see eae oe eee ee eee 27 Diameter ot -vegetativercell G-l0us 5. a-- oa. cea eee ee 28 Diameter of vegetative cell 12-l5u................ 166. Oc. bahusiense 28. Gynandrosporous only.......... 167c. Oe. platygynum var. novezelandie 28. Idioandrosporous only.......... 167a. Oe. PEE obtusum 28. Gynandrosporous and idioandrosporous......167. Oc. platygynum @osporetwall:smooth::.:.. “oe Sonen. steers ae ene ee Oospore wall longitudinally ribbed................194. Oe. michiganense 302° Tidtoandrosporous: Uaiae oc serie eae tioee i eeeeee a ao Creer 305% ‘Gymandrosporousss.cc.n ss fora ee eee 32 Oovomumi4s=60 62> (4s. 345 ene eee 190. Oe. praticolum @oronium 66-18 72-90 ure eae eee ee eee 191. Oc. supremum 32. Diameter of oogonium 36—-42u............... 192. Oe. wabashense o2. Diameter of oogontumirAl2—ooan. i aes tae ee nae ee 33 32. Diameter of oogonium 55-58u...189a. Oe. obtruncatum var. completum Beng tiohoogonium~oG-beuee eee seeee eee ae 189. Qe. obtruncatum Length of oogonium 68-75u............ 189b. Oe. obtruncatumvar. ellipsoideum 34. Vegetative cell 2-3u in diameter............ 203. Oe. fusus* 34. Vegetative cell 4-6u in diameter............ 210. Oe. virceburgense* 34. Vegetative cell 6-13u in diameter........... 211. Oc. spurium* Diameter of vegetative cell not more than 2u...... 197. Oe. angustissimum* Diameter of vecetative:cell' 2-602. soe er ee eee Eee Cee oer 3 Diameter of vecetative cell766—=)G0=938n. 22-2) a eee ee 268 36: “SWithoutidwartamales 27505 2. 1s ees sr eee ce eee en ere ne eee 37 36. ° Wath dwart tnailesia os 74 aha eee Oe ete ee cee ae 186 Oogonium ‘opening by a pores?.2: <2. ce face -= ae See ee eee Cee 38 Oogonium opening bya did is: i-32h..)eee.s nc eed oe ee eee 139 38: ‘Pore median. on Rae, Hee cre sine ions Sen ceca Pere Cree See tee 39 38. Pore supramedian (rarely varying to superior).................... 51 38.” Pore superior... si $ 04 sees eaten © eas ee ee eee ee 63 *See footnote, page 53. {Some variations of Oe. varians may be sought here. OEDOGONIUM 55 Wiclikois OOSPOnesSimOOUls vee ercicl. salcitiss setts sis re cee cee nace ehldn esa’ 40 Wielitotsoosporerscroniciwlateres. 1. nes dac-s 0% ce oe ce wen vealoctutenee sel 49 WralllkoroOsporerechuatevcec css Accs 4 c.cbciie ds comes eccssvasdece cone cuca 50 ARE LOMO CCIOUS HMR nG Faience rors cie ee e ise beste steeceua meee es 41 At) ED TOCCIOMS meets See nian ae cis oF ueeiEe aieinis lad miler ace cas wes ate ones 44 DiamMeTreMOMOOUZOMUM SAC Ks ss cSe a cieloss soc sles ese nbseeccdecneod® 42. Diameter of oogonium 32-38y.........5.20.05.:.+. 1. Oe. laeve 42. Filament irregularly curved................ 2. Oe. curvum APM ATO eH CESLG ATM ie Mier ieee Geir Si © ccs cla Sale we dcreelune sos 43 Ooronimim 25=28 Xe 26S ek seal ese See eae 3. O08. cryptoporum Oogonium 18-25 X 18-26h............. 3a. Oe. cryptoporum var. vulgare AAS Diameter OmoosomilUumme Arete ss Gos See cn scree cess cis Seale cans AAP eM iaIMetet OlMOOCOMUM lA (—OoMe os es. sacks Sons cee cee cn eeeneeees 47 AAS e Diametemot OOsOnitin SU=GO.. 265-8. Se ive oss ces bs sek ou slne ones 48 Drametemotmecetative cell o-lOue eee oct cies sce 6c are vache cbse sans wets 46 Diameter of vegetative cell 8-I3u..... 4b. Oe. rufescens var. lundellit 46. Diameter of vegetative cell5-Qu 4a. Oe. rufescens var. exiguum 46. Diameter of vegetative cell 8-10u........... 4, Oe. rufescens Diameter of vegetative cell 9-llu..... 218a. Oe. inerme var. mentiens* Diameter of vegetative cell 11-l4u................ 5. Oe. calcareum AS OOSPOLEHS OOM a oS TOON. i. a. cincinnati eee 6. Oe. sociale AStaOOSPOLCISd TOS) NUL ROL. snes cesta oe pac 218. Oc. inerme* IMOnOECIOUSSe seers ore oe ac ce ese a caw en emeee st 7. Oe. cymatosporum Dioecious (very rarely monoecious)............... 8. Oe. magnusit 50. Diameter of vegetative cell 9-l4u........... 9. O68. suecicum 50. Diameter of vegetative cell 14-16z, 9a. Oe. suecicum f. australe Oospore scrobiculate, 22-27y in diameter.......... 217. Oc. moniliforme* Oospore scrobiculate, 43-48y in diameter, 66a. Oe. argenteum f. michiganense Oosporeismoo umes teres: ool snss5 82 dae shapes otc At oe sens oe ees 52 HUME LOTOCCIOUSHEE Eee SS 5.05 Sak 300 55 LER oa wa ieeiagaig sina 6 hae. 53 SDE DIO CCI OUSHE rat Se see aS oS ROE coe gee mans Ha eae gas 58 52. Both monoecious and dioecious............. 10. Oe. varians IRoserapiiitictabovesimedianuted< Tat oe hoes bent ad nie Geyser .'s 56 Pore variable between these two positions.................00 ee eeeeeeee 57 je Diameter ob oogonitum 34-450" 0.0 .aeen. 2.....-s-- 5. Rae Seed 55 54. Diameter of oogonium 46-55u............... 11. Oe. urbicum Oospore depressed-globose, 30-34 K 28-32u........ 12. Oe. obsoletum Oospore regularly globose, 30-39 * 30-39y......... 13. O8c. plusiosporum Dow Oospore sl—4l x -30—-4) ae. seas es 10. Oe. varians bom Oospore.40 48) 40-482. Phase es ees 14. Oe. tyrolicum Terminal cell narrowed and often setiferous....... 225. Oe. inflatum* Terminal cell neither narrowed nor setiferous...... 11. Oc. urbicum Sis, [torre a, Iniimel evel ovonyasanleye behalf 5.5 ante Ces EERO hee eerie ene 59 DEP OL HNe Ailes MCI OL Mewar kin ess tree ae ste asst owe bess 006 60 58. Pore variable between these two positions....................05-. 62 Vegetative cell 1-3 diameters long.... 15b. Oe. cardiacum f. pulchellum Vegetative cell 3-7 diameters long................ 15. O8c. cardiacum 60. Diameter of vegetative cell 8-12u........... 16. Oe. franklinianum 60. Diameter of vegetative cell 12-l6u.......... 10. Oe. varians Hae Diametenommeretanive cellil4—80 oe see es oie’ eee ee ace 61 Oospore depressed-globose, 31—42u in diameter, 15d. Oe. cardiacum var. minus Oospore subglobose, 42-49u in diameter........... 17. Oe. glabrum Oospore globose, 43-58u in diameter.. 15a. Oe. cardiacum f. interjectum Oospore ellipsoid-globose, 40-52u in diameter, : 15c. Oe. cardiacum var. carbonicum 62. Oospore not filling oogonium................ 225. Oe. inflatum* 62. Oospore completely filling oogonium........ 18. O6¢. lautumniarum *See footnote, page 53. 56 VT aE HOE DOGO AGE AE 635" Wallsofioospore smooth ape sats 10a cate eee ne Eee nee 64 Oda otfoospore:lomenitu chimealliltvarrst oye Ge a eee eerie ee 116 63% Walliotoospore:anrcOla tenet pon. oa. Ree 129 G3 Wialilkoioosporesmeticullaite nu at. &.n - Weiess enc = acacia eee eee 131 63:0 Waillvoiioosporetpiitedhaok, «05 a Se hac bye ain sis cos Je te ee eee 132 63. Walltoioosporeisenobicullaite:. 7 52 arr a. ere on een Sencar eee eee 133 G4a@ Mon Geciouset ett sc. och ap PC aoe a NE ee eee 65 G4 ADIGECIOUSH ei es S 55g bd oy Oa he ee ee 83 64. Reproductive structures imperfectly known....................... 113 65. Diameter ot vezerauive celliS—o4 0.5. see fee nee ee eee 66 65. Diameterol veretative cellis3—540. 2. . a. cise de ee eee 80 665 Diameter of cogonitum»s2—s6)(—40))u25 5-4 a eee eee 67 665) Diameter of oogomium:s0-OSstee 1. 4a ee ee eee 70 66. Diameter of oogonium 63-68yu... 29a. Oe. upsaliense var. fennicum Of... VegetativercelliS=l4inidiametens 49s. see are tone eae re ee 68 67. Vegetative cell 15-18u in diameter................ 19. Oc. intermedium 68. Length of oogonium 32-46u................ Fti4 Oe scar ar AN ae a A 69 68. Length of oogonium about 53u.............. 226. Oe. warmingianum* 69° Oospore 28-3illeamidiameter- 4...) 525.55 eee ennee 20. Oc. hirnw 69. Oospore 30-37 (—40)u in diameter.................. 21. Oe. globosum (Os elanttewrcelledswhentmatune: see ener ee eee ee 71 (On selantamany celled whenimattine ease an: eee eee nee: 72 71. Antheridium single, alternating with vegetativecell. 22. Oe. zigzag (ineAnthendium'=l—4 imiseniest..--eereenee aaa 23. Oc. curtum 2. Oospore globosesto;subelobosess1.-0 06 5 eee eee eee ee 73 (22 Oospore Obovoidetorelllipsaicd aaa tei eer eee ee 77 das Diameternonvesectativie cellu 101i. nae ety a nee eee 74 (a> DiameteronveretativierCellelO=o4rcgaa irae aes eee nee 76 (4, ‘Oospore completely fillingioogonitim..-) 4. nos ssee eee ee 75 74. Oospore not filling oogonium.... 19a. Oe. intermedium var. fennicum OO: > pA Me THelacI Lassen. cs, egy: Seer en ee ge een 24. Oe. fragile (on eAnthertdiuimyo—-Ole. sence aoeeeee 24a. Oe. fragile var. abyssinicum 76. Oogonium usually globose...... 24b. Oe. fragile var. robustum (Op Oogonium»usualllyxovoldeasn een tern eerenitr 25. Oe. vaucheru 77. Division of antheridium horizontal................ 26. Oe¢e. richter1anum i”. “Division of antherndium vertical: .6+. 30.5... <,.4e eae ee 78 78. Vegetative cell 8-14u in diameter........... 27. Oc. pseudobosci ios Wegetativelcell 14-24. “inidiameten seen seen ae eee eee 79 (95 Oogontam 40-44 >< 70=S80n. ee eee aeons 28. Oe. sodiroanum 195, Oozontum 45-50 << 66-100n Sena cements ee sare 29. Oe. upsaliense (9s Oosonimm48—b5 \Gb=e0u pee ee ee eee 30. Oc. oviforme SOs Diameteror OocOnitm Od Ole aaa eee ene ee 81 8058 Diameter of cozoniumiG8—9due. «eee eee eee 82 81. Diameter of vegetative cell 37-48u................ 31. O68. geniculatum 81. Diameter of vegetative cell 50-54u................ 32. O8c. subocitangulare 82. Diameter of vegetative cell 33-37y.......... 33. O80. martinicense 82. Diameter of vegetative cell 44-52u.......... 34. Oc. kurzuw 83. Diameter of vegetative cell 11-l3u................ 223. Oe. lageniforme* 83. (Diameter otvegetativercellil4—bGi ee eee ee eee eee nee 84. Oogonium scarcely exceeding vegetative cell in diameter.......... 85 84. Oogonium noticeably exceeding vegetative cell in diameter........ 86 85. Oospore globose to cylindric-globose.............. 35. Oe. capillare 85. Oospore cylindric-globose to subcylindrical, 35a. Oe. capillare f. stagnale 85. Oospore subrectangular-ellipsoid.................. 32. Oc. suboctangulare 86. Oospore globose, subglobose, or cylindric-globose................. 87 86. Oospore ellipsoid, obovoid, subcylindrical, or subellipsoid......... 95 8@ Maleiilament of samevdianietenaspremial Gn. seeerrn) are eee: 88 Si.) Maletilamientismealilersthan) females nmi. (1 eee er eee eee 90 88. Oogonium 36-42u in diameter... 36a. Oe. plagiostomum var. gracilius 88. Oogonium 42-49 in diameter............... 36. Oc. plagiostomum Sos Ooconium 54-68 in cdiameen ss ane eae aoe ae eee eee 89 *See footnote, page 53. 113. 113. OEDOGONIUM ae Vegetative cell 16-26 * 112-250u.................. 17. Oe. glabrum Vegetative cell 33-42 X 42-130u.. .... 38. O6e. princeps 90. Diameter of male v egetative cell 18-33 “led. EOF: Re Ol Se eae ea 91 90. Diameter of male vegetative cell 34-5Qu.......................... 94 Oospore usually ellipsoid to cylindric-globose...... 37. Oe. capilliforme @osporeiusuallly clabosetolsubsloboseyees. 8.2. nda ct cece ee dee uses 92 DED ivisionromanthencdimmyhonizontaleeassess 62s .ce.soes.cecs-se. n. 93 92. Division of antheridium vertical............ 39. Oe. biforme Oogonium 40-53 X 40-65y............. 37b. Oe. capilliforme f. lorenizit Oogonium 46-57 X 52-64 (-80)u....... 37a. Oe. capilliforme £. debaryanum Oogonium 36-53 X 48-60u............. 37c. Oe. capilliforme var. australe 94. Oogonium 46-564 in diameter... 37d. Oe. capilliforme var. diversum 94. Oogonium 54-65u in diameter............... 40. Oe. anomalum 94. Oogonium 70-85u in diameter............... 42. Oe. rivulare Diameter Ooozoniuim so -OonC-OS)iinee sds ss oes se fe hea. deo oe ve 96 Diametrernovoozonitm (GO=)G3-90ws -. 408... 2 oe cn ben boobies cc hones: 106 96. Male filament larger than female............ 43. Oc. pachyandrium S65) Maile filament notlangen thamtemale,... 22.2.5. 5...0..2.4.-0cssc- 97 WeretativercellMl—S diameters longa ile anne ee ee ies wa dsc deca 98 Weretativercelli2-Gidiametenslome=s ase sia enas tes ec ee os ee ens 100 Wegerativeicellig—lledvametens, lone: jn a.lseei eee cn ns oa va awk. 102 98. Oospore 40-60u long............ 35a. Oe. capillare f. stagnale OS see OOSDOLGIOUS CULE lOMe in sancti nhs Stn ini8, APM EMR pe en es 99 Diameterioroospone lollies secs. eee oe: 209. Oe. oryzse* Diameter of oospore 40-56u...........209a. Oe. oryz@ var. seriosporum* Diameteromoospore ol—OUweesre. s.-2 606s e nse 44. Oe. mexicanum 100A Cellsdiameterion malewnlament 18-282. 98-4 os seed. ose es 101 100. Cell diameter of male filament 28-33u....... 45. Oe. grande 100. Cell diameter of male filament 32-42,, 45d. Oe. grande var. majus Oogonium usually obovoid............ 45b. Oe. grande var. aequatoriale Oogontuni usually subobovoid.............. 05.925: 39. O8c. biforme 102. Division of antheridium horizontal, 15c. Oe. cardiacum var. carbonicum LOZ ee Divistonromanthenridiumi wenticale..). 1,082 5405 5266s nea ascns nae 103 Woconiumyuisuallyrobowoids ens: 0.1.5... eee 46. Oc. oboviforme Oogonium usually cylindric-obovoid............... 39. Oc. biforme Oogonium usually subovoid or ellipsoid-ovoid.........................5. 104 104. Diameter of oogonium 42-52u... 45c. Oe. grande var. angustum 1025s Diameter ooorgonimmy 49-84. ay yee ewes ke eco deca es 105 Diameter of vegetative cell 20-27u.... 45a. Oe. grande f. gemelliparum Diameter of vegetative cell 28-87u................ 45. Oe. grande Diameter of vegetative cell 36-46u.... 45d. Oe. grande var. majus 106. Oospore conspicuously not filling oogonium.. 42. Oe. rivulare LOGE Oosporemeanlwoneuite tillinesooconiumeyns se nese ls ss). oe 107 Mereraunercelilel—Gidiametens lomg sent. u.. cee tet sae oes msde ees 108 Vegetative cell 6-10 diameters long............... 47. Oe. subrectum LOSSeCellidiametenomealestilament 80-37-4415. 52255-2205 .0¢005 nee ve 109 LOS Gellidiametemormnalertilamentmeb—O0Me sso. oes sec acs oe. .-e aoe se: 110 @osporelobovoidstorellipsoid=s.- 2.) 4.0.50... 20 48. Oe. landsborought Oospore ellipsoid to globose-ellipsoid.............. 49. Oe. crassum Eee etieerta i OOSPONCM fic LOU fle Ne on Sk oa Ath csoa oes al pee ee eases ACL 110. Length of oospore 100-125u..... 49b. Oe. crassum var. longum Diameter of oogonium 64-73y......... 48a. Oe. landsboroughi var. norvegicum DiAmMetemomooconiimnlo-O0 wwe wee eye Aoisi deo. ecole ae ae auadawt ms 112 112. Vegetative cell 1-3 diameters long, 49a. Oe. crassum f. amplum 112. Vegetative cell 3-5 diameters long, 49c. Oe. crassum var. subtumidum Diameter of vegetative cell 6-24 (G27). - 2. so. hace tect ace eet e peeves 114 Diameter of veretative cell 24490... 3. ose ccc ee ee ese aaa’ 115 *See footnote, page 53. 58 115. 115. wa. il7e Te LS: J 4 121. 121. 123. 123. 125. 125. 127. 127. 129. 129. 131. 131. 133. 133. 135. 135. 137. 137. 137. THE OEDOGONIACEA®E (AP OoconiumlabouitoomGIoh ee ane eee 226. Oe. warmingianum* ITA Oozonitmtsso0pe 45-Onleeeeeeee eee eee ee 223. Oc. lageniforme* 114), Oogonitum’3(/—49) x 54-16 ee ee 225. Oc. inflatum* Oogonium’/43>55.X 40-95 ues wae ee eee wee oe DU0s Oemorizcs Oogonium 42-60 X 43-99y............. 209a. Oe. oryz@ var. seriosporum* 116.. Outer oospore wall ribbed externally........ 50. Oe. exocostatum 116:. Middile*oospore-wall sibbedextermallly2on.05- ee eee aes 117 Ribsicontiniotisvandrentire’.. ..).he ae a ee ee DE ee eee 118 Rubs) cranulatercnenate) crenulate yon pitcedaee ae ene eee ene 126 Rabsidentate weer eerie cisions oe 57b. Oe.crenulatocostatumvar.aureum 1837 Ribsb=22 stinenuamibers<245.:,. ae stan Le ae ee eee 9 LIS.» cRalbs?26=3 byaaaenntarrally ex: aare.c cyte. esate coo cor eae Ore 120 LIS Ribs —opmenum bDetasan teen seer re cae 51. Oe. kjellmanit Vegetative cell 10-15u in diameter................ 52. Oc. paulense Vegetative cell 24-30u in diameter................ 220. Oe. urceolatum* 120, )AMIONOECIOUS feos etter Ae ee ae Ie ne ene 121 120: SDiGEClOUSie yes co Bee oe I ee ee 123 @osporeicompletely, fllinssoozonitime eee eee eee eee Ere ere 122 Oospore not filling oogonium.......... 53b. Oe. paludosum var. parvisporum 122. Oogonium 39-48u in diameter............... 53. Oc. paludosum 122. Oogonium 54-63y in diameter... 58a. Oe. paludosum var. americanum Oospore usually completely filling oogonium....... 54. O8e. leiopleurum Oospore usually, not fillineioorontumil ese ee eee 124 1245 Oospore ellipsoid? 5)... :nee eect eink als oe Oe Cee et ae 125 124. Oospore ellipsoid-globose, rarely subglobose, 55a. Oe. bosci f. dispar 124. Oospore ellipsoid-obovoid or obovoid, 55b. Oe. bosci var. notabile Diameter of oogonium 33-388yu......... 55c. Oe. boscu var. occidentale Diameter oroogonitmo9—olu.s.-.56 ee. eee 55. Oe. boscu 126: Ribs t4=20 im nuimber? s7s..vac cn seeie sa.o ee ee ee ieee 127 1265) Ribs s0-s5aninumiber ea -ree ree ace meee 56. Oe. margaritiferum 126, Ribs 30-45 im number aa. ee - e eee 51. Oe. kjellmanit Rabsitcrénulater ss in. iss Soe, Leer ih ee ee Pe: 128 Ribstcnenatekecnccce ee caer, 57c. Oe. crenulatocostatum var. longiarticulatum IQSseuRabsidistinetlycrenulaite eee cece eee 57. Oc.crenulatocostatum 128. Ribs scarcely crenulate.. 57a. Oe. crenulatocostatum f. cylindricum DI OSCLOUS Sf obi Sara ss os cre ites SOEs STO SPOS see 130 IMionOE CIOS a shots tS as Bee atau ocet eee 58. Oe. arcyosporum 130. Diameter of oogonium 30-35u. 57b. Oe. crenulatocostatum var. aureum 130. Diameter of oogonium 48-60u............... 59. Oc. areolatum 130. Diameter of oogonium 66-72y..............- 214. Oe. hoehnei* Oogoniumss—40 e581 One enieere 60. Oe. dictyosporum OogoniumrapoutAg CSCIC CRIN eee Re eg en 142 RAMS SOU OOMMENUTMDeL eee tei e cits eet ce techs wbawhls news. sotew: 143 142. Diameter of oogonium 48-52u... Tla. Oe. paucocostatum var. gracilis 142. Diameter of oogonium 54-60y............... 71. Oe. paucocostatum 142. Diameter of oogonium 59-74u............... 72. Oc. australianum DROCCIOUSH NENT pms Rohe ee tae elem 73. Oe. tumidulum NICH OCCIOUS HEME Tarte et rot eet dae tees, ees oc ke cctaia sn ouethg aly t 144 Reproductive structures imperfectly known........ 219. Oe. sol* ta Oospore 48-09) Xe O0-OShe aes ee aes dee oa 74. Oc. nobile 144. Oospore 58-59 X 72-80u........ 74a. Oe. nobile var. minus 1Aae Oospore Goo) ~S8—lO4us ee tn eee 75. Oe. insigne Moraninmi weno projections. | oA. Wee eee Ree hee oe ste he eet 146 Miespeairitise wih) PEOFECIIONS meee DCia > Ocoee ioe aoa 153 1G, IMMOTMOCNOTES:.. «oo oo 5 acd GOO EO So caine i Cee ae ar oro ere 154 Diameter of oogonium 29-33y................006- 79. Oe. howardit Diameter of oogonium 33-40y.................... 80.. Oe. pratense iad Oovzonitim subslODOSEs:<4.....0 cae. + +. oe = 82. Oe. acmandrium 1545 Oogonium pyriform-globose:.......-..-...- 83. Oc. psaegmatosporum WPIOECIOUS ian see's “HG dccidj2t Sid Cin eee ee Ea 89. Oc. mitratum NIGH OCCIOMS EIN Ie epee fever Fenleiccs cas tie stg vee ee 90. Oc. petri JNTaitdl RETETG MUBTEM FAVE, LECOLON AALS ors Coo Bin Gebee Bema RSME Onre eRe oe re Cie eee 156 156. Oogonium 15-20 * 15-23y..................210. Oe. virceburgense* 156) “Oogonitim 27-28 X 26-28n.... 2... det suse we: 222. Oe. consociatum* IDNOEONOES ohne oe W616 a RO GORI OO GRO IISae DENCE ics iP a tare 158 LOTUS ISITTIS. 2 ce Sci 6 wo BO Bod OS ORD IESG ERG an vo) IER at tea 165 Both dioecious and monoecious.................. 91. O68. trioicum Reproductive structures imperfectly known................6.0+ see eeeee 183 158. Diameter of oogonium 13-l6yu.............. 91. Oe. trioicum 15sseeOtameter Of oosoniunml 16-430). 26.2 see ce eee ee reese Jace tad, 158. Diameter of oogonium 43-50u.............. 92. Oc. welwitschi 158.. Diameter of oogonium 52-60yu.............. 93. Oe. 1owense 158. Diameter of oogonium about 82u........... 94, Oc. dioicum eer mI OOSE LO SUDZIODOSE.......5. 005-25. eb eee eee tee ee enon es 160 Wespore ellipsoid, ovoid, or Oblong... 1.0.0... hice eee ee eee see 162 *See footnote, page 53. 60 THE OF DOGCON FACEAE 160. Vegetative cell 1-3 diameters long, 95a. Oc. pringsheimii var. abbreviatum 160") Vegetativeicelij2-oidiamietersvongaer ce. eels ee 161 Female vegetative cell 10-15u in diameter, 95b. Oe. pringshermi var. nordstedtii Female vegetative cell 14-20u in diameter......... 95. Oe. pringsheimii 162. Diameter of oogonium 16-20u... 99a. Oe. pisanum var. gracilis 1625 (Diameteriotoocontum2s—20 ne ae eee eee eee 163 162. Diameter of oogonium 28-38yu............... 202. Oe. sancti thome* Oospoze filling oogontamimlongitudinallly, =). 5254s eee eee 164 Oospore not filling oogonium longitudinally........ 97. O80. porrectum 16455. Basal. celltelongater 70-0) 2c. 4. tee 99. Oe. pisanum 164. Basal cell subhemispherical.............-... 98. Oe. nanum Oosoniuma pyaitornatolsubpiyscito ride cee eee eee ae 166 Oogonium obovoid-globose to subglobose.....................2....000-- 169 Oogonrumvellipseid to1oblonges.. 947-48. o o eee Eee ilZ/7/ 1665 *Diameterorvesetativie cellS—lilin snares ee eee 167 166. Diameter of vegetative cell 11-l3u.......... 102. O8c. simplex 166. Diameter of vegetative cell 13-I6u.......... 100. Oc. pyriforme Diameteromoogonium 2o-s0Ws..s5 00 ol eee ee eee 168 Diameter of oosonium: s0-s3u--) 4 - eeeee oee 103. Oc. pyrulum Diameter of oogonium 3440y......... 103a. Oe. pyrulum var. amplius 168. Oospore subglobose, 22-26 X 21-24u......... 104. Oe. loricatum 168. Oospore globose, 25-29u in diameter.........106. Oe0. pithophore Diameter.ofvecetativercell Sl6ie- seek ae see ee eee 170 Diameter of vegetative cell 16-20u................ 107. Oc. autumnale Diametermokwegetative celle20—2 jae eee ae ee eee 176 IZ0= Oosporesnot tlle toGronilim: oases a see eee ee ee 171 i705, ‘Oosporeyhilling, cogonmiGm=-mapeoe ene noe eee eee eee 172 Diameter of oogonium 30-88y......... 109d. Oe. crispum var. hawaiense Diameter of oogonium 40-43yu..................... 108. O8. obesum 172. Diameter of oogonium 23-28u............... 104. O6¢. loricatum iW2Ze sDiameter or ooconium s0-osise 6 eee eee eee eee 173 i722. Diameter omooconiumiss 00 Wes) aoe ee arene eee 174 Vegetative cell 1-3 diameters long... .109e. Oe. crispum var. uruguayense Vegetative cell 3-5 diameters long... .109c. Oe. crispum var. gracilescens WA Oorsonitimrobovoidseloboses., pean ee eee 175 174. Oogonium subglobose........... 109a. Oe. crispum f. granulosum Diameter of oogontum 38-45... 22.24.52 - 6 ee ee 109. Oe. crispum Diameter of oogonium 40-50u......... 109b. Oe. crispum f. inflatum— 176. Diameter of oogonium 44-49u...110a. Oe. rupestre f. pseudautumnale 176. Diameter of oogonium 48-58u............... 110. Oe. rupestre Diametes oh oogoniuml9—l4i22 52 es ee 201. Oe. selandie* Diameterok oosonimmMelS—19 in ete ee eet ee ee ae 178 Diameter-oroogonium: 2028p) 24.00 45 ie oe eee 179 Diameter of oogonium 35-42u................5.... 111. Oe. ahlstrandu Diametenotoosontumo0—/0nees ease oe aoe 112. Oc. pachydermum 178. Length of oogonium 25-28u................. 91. O68. trioicum iS: Length of cogonitumis4—40 ne a an ee 114. Oe. gracillimum @osporenearly or quite filling oosoniuml 42. +. ee eee eee one cee 180 @ospore not fillmeoosoniumyloneitudinallly, 924" ee eae 181 180. Vegetative cell 7-9 X 11-86y................115. Oc. oblongellum 180. Vegetative cell 8-15 X 16-60u...............118. Oc. kirchneri Oospore oblong-ellipsoid..............114a. Oe. gracillimum f. majus @osporeieloboseyeess4saee eee reree 116b. Oe. oblongum f. sphaericum Oosporevellipsoids #3532 Oe de Ra oe ee ee eee 182 182. Diameter of oogonium 20-26u............... 116. Oc. oblongum 182. Diameter of oogonium 26-28u...116a. Oe. oblongum f. majus Diameter of oogoniuml 9—l4n2 0.52. 23 ee see oes 201. Oc. selandie* Diameter of oogonium 28-33y....................- 202. Oe. sancti thome* Diameter oh cozontum) c)—-44 pos. ae eee eee 204. Oc. rhodosporum* Diameter of oogonium 40—45u..................... 205. Oe. vesicatum* Diameter of oogonium 40-50y....:................. 206. Oe. montagner* 185. 185. 187. 187. 187. 187. 187. 189. 189. 191. 191. 191. 193. 193. 195. 195. 197. ii 197. 199. £99; oe 199. 201. 201. 201. 201. OEDOGONIUM 61 184. Oogonium with mammiform projections.....118. Oe. mammiferum 184. Oogonium with conically obtuse projections...................... 185 184. Oogonium with projections intermediate between the two above, 117a. Oe. itzigsohnii £. heteromorphum Diameter of vegetative cell 5-7u...... 117b. Oe. itzigsohnii var. minus Diameter of vegetative cell 8-l0y.......0......... 117. Oe. itzigsohnii DIOECIOUS, NANNANDROUS, WITH CYLINDRICAL VEGETATIVE CELLS. she Ooaronium openins bya pare penne ce. bee oe bons ot SS ER Pad. 187 [Sie Oosonrum Gpenino byeagliGun see. te wicee te nae he eee. 228 Pore median, or alittlejabowemedian Sivek. ace baton eo ws. 188 Pore inframedian.....................128a. Oe. hystrix var. canadense BOWE Soharesia lad ei al gmeg so as peck oot a Oe ene ee ee 2 201 BREESE CITOEIES tr MPO Cone toe ee ey at ae ee hs AN yet Bene 202 IER SULbe ChE, ae a BG ee ce eles Lo A Oa ak ae ne Aaee Pe 226 Tey ali GOSNOTE, CChina Lela. .s0ke haath Beebe te) «bales HAs ek 189 188s Walliotoospore punctate... ..4s45..a5s5+s-- 120. Oc. nebraskense [SS Vi aol Oospore spirally ribbed? 2: c.cchs betes Senin a sn cake es 194 Peace Wotlk OhroGsporeySmMOOtliazd . \ts eat. Mer ees fs Shere rset ea hoes os 197 Spines more than 5u in length......... 124a. Oe. echinospermum var. horridum SrmesMessnbacanenupimmlen ora Nen uk Aes. kl ce deny AM ee oe os 190 OU oulmaltory eel lentarsed seus. sn ctas s oh 122. Oe. hystricinum 190. Suffultory cell not or very slightly enlarged...................... 191 Diameter of vegetative cell 7-l3yu................. 121. Oe. aster Diameter of vegetative cell 12-l6u................ 125. Oe. pungens Diameter cmverctative.cell 17-30w... 0) 26 2. Shoe bw he ee ne ds 192 192. Diameter of oogonium 36-38u...123b. Oe. hystrix var. subglobosum 192 eDiametenohoozonitim, s8-O0uls. 2.2 ...4) 8 ee ee 193 WesporemIGOOSGwees ee bac ee eS. oo ED Oe 124. Oe. echinospermum @aspucetellipsoides a-hole red nwiatee desc 123. Oe. hystrix eee nil bomvece lvenlaneed’ -)2) je... eet ocr ak FUR ees Os 195 aS oil corvecell motenlareed. 4 0)... 4 1 debies aeOee eee ae 196 Oogonium 40-44y in diameter..................... 126. Oe. exospirale Oogonium)ds1—60e imidiameter .2...,...2.....25.5: 127. Oe. illinoisense 196. Diameter of oospore 37-45u..... 128a. Oe. spirale var. acutum 196. Diameter of oospore 46-56u................. 128. Oe. spirale WEcpoie aos uo subslo Waser = ..).2 221... Sal Sea eek ea. 198 Oppo re semaaotlar-ellipsoid ty en cc.! pe erties, De ee Ee 200 Waspake votes .. i515 552). NoRs. OS 132b. Oe. braunii var. zehneri 198. Vegetative cell 8-9u in diameter............ 129. Oe. depressum 198. Vegetative cell 9-12u in diameter........... 130. Oc. semiapertum IGS we Vieretative, cell 2-23 nam diameter... ..d1.0. s4eeesees cos sks. o- 199 Diameter of oogonium 23-30p......... 132a. Oe. braunii var. hafniense Diameter of oogonium 30=37w..)..........---...<- 132. Oe. brauni Diameter of oogonium 43-48y...............5..... 131. Oe. gallicum Daameter of oogontum 49-52p-... ee ea ood 133. Oe. flavescens 200. Diameter of oogonium 19-30y...135a. Oe. sexangulare var. angulosum 200. Diameter of oogonium 29-33u......0........ 135. Oc. sexangulare 200. Diameter of oogonium 36—42u...135b. Oe. sexangulare var. majus Masporeqvall punctate. .-)55.92-54 secs. ae ee. 120. Oe. nebraskense Oospore wall spirally ribbed..........128b. Oe. spirale var. latviense @aspore wall smooths. o.oo. se oa ot 143a. Oe. multisporum var. magnum Mocmoareawell COMINAte, AG... bons ead paelea eae 134. Oe. manschuricum rete DOLE WAMU STOOGES er). o..04 sola osie a RI k ba as ok ben 203 me Oospore walbdentates. 6 ois. 5.5 ea 136. Oc. stellatum f 202. Oospore wall spirally ribbed... .128b. Oe. spirale var. latviense “ese AQESICU TENE UL arse) niiha ar (aie ena eres ea Sennen Le we gt aed ee ae 215 02. Oospore wall jengitudanally ribbed... :2.. 6080. Wave os ho.. one 218 Pee SOLE Wa lnplnbeGnot oe tr ier te ae eRe On oe oes”: 225 *See footnote, page 53. 62 203. 203. 205. 205. 207. 207. 209. 209. 211. 211. 213. 213. 215. 215. 217. yA 217. 219. 219. 219. 221. 221. 223. 223. 225. 225. 225. 227. 227. THE OFDOGONTACE AE Sultulitory cell enlarged: Sai. acacia One eee eae eee 204 Suitultorycellinot enlarzedtaea ace acter eres ee noe nena: eee 207- 2042) Diameter oF oogoniumils5-O0 uae nae ee eee tee 205 204. Diameter of oogonium 53-60u...138a. Oe. borisianum var. westit 204.5 Diameter ofoogoniumilG5-S0uien.as toes een Oe 206 Vegetative cell 12-15) XSG0-120 05. eee ee ee eee 137. Oe. silvaticum Vegetative cell 15-23’ X 45-150uge.......5.....5... 138. Oe. borisianum 206. Suffultory cell 26-40u in diameter........... 139. Oe. alternans 206. Suffultory cell about 44u in diameter........ 140. Oe. kitute Diameteriok vecetativercell 10-2004. eee nee ae ee 208 Diameter of vesetativie:cell?21—A0w..2. 2 85 ee se aes oe ee eee 210 208. Oogonium 24-35u in diameter............... 143. Oe. multisporum 2083 ‘Oogoniumisos—ouanidiameterss-ce oe ae eee eee 209 Oospore slo bOSesmee een acinne ee a ame 144. Oe. irregulare Oospore depressed-globose..... 0... =... 144a. Oe. irregulare var. condensatum 210% “Diameteror oozonitims9-COus ae acaene sie eee eee 211 210. Diameter of oogonium 65-80u............... 139. O6e. alternans Vegetativeicell l—3)idiametersilone-...41. sence eee eee eee 212 Vegetative cell 3-6 diameters long? 2... cae eile ere tee eee 214 2125 Oospore not falling oogonimm's. 4. eee eee 141. O8e. victoriense 212°, ‘Oospore nearly or quite fille oogonium=...---s-se ee eee 213 Oogonium 39-54 X 42-65u........... 142a. Oe. crassiusculum var. ‘arechavalete Oogonium 55-60 X 60-75u........... 142c. Oe. crassiusculum var. cataractum 2I4e AGynandrosporouss. 1... scan One aoe 142. Oe. crassiusculum 214. Idioandrosporous........ 142b. Oe. crassiusculum v var. idioandros porum Spines arranged: spirally’ . «mcs e.g cs «alehneliee acoso re oe ae eae 216 Spines not arranged spiralliyaccunesece eens ae eee eee 217 216. Diameter of antheridium 6-9n. .1386. Oc. stellatum 216. Diameter of antheridium 9-10p. 145a. Oe. donnellii var. wittrockiana 216. Diameter of antheridium 14-l5y............. 145. Oc. donnelli Diameter ofooconium: 29-scou..- cae cele ieee 146. Oc. armigerum Diameter of oozonitmiso—oOle.. 425-6 eee ene 147. O68. echinatum Diameter or ooronium 46—-o71. 4.555 seer 148. O8ce. lindmanianum Z18-eRAbSa6—2odn nium bene. eee oon BME cn ace Tuer 219 218. GRibs25—40in number... css Govan eR or Se eee 223 Oogonium 45-50u in diameter......... 149a. Oe. cyathigerum f. americanum Oogoniumi4s=6o nq inidiameters. 4... odes deacons Geen ne eee 220 Oogonium 65-81y in diameter......... 149c. Oe. cyathigerum f. perfectum 220. Oospore usually completely filling oogonium...................... 221 220. Oospore incompletely filling oogonium, ‘ 149d. Oe. cyathigerum var. ellipticum Dwart male4/—o8uin length. [oe sere bee oe ee ee Oe eee 222 Dwarf male 60—75u in length.......... 149b. Oe. cyathigerum f. ornatum 222. Diameter of oogonium 48-57y.149e. Oe. cyathigerum var. hormosporum 222. Diameter of oogonium 5/—66u............... 149. Oe. cyathigerum Ribsienenttlate.~.cc ee oe e eeee 150a. Oe. wolleanum var. concinnum Rabsvenitine acy 2905 A 3 store scueciolas oeroerae lS TO eae ee Ne: ee 224 Pp IRN OK Pays) elanbhanlOYSean5ocuunanedescancGonce 150. Oc. wolleanum 224. Ribs 35-40 in number........... 150b. Oe. wolleanum f. insigne Pits more or less in longitudinal rows............. 151. Oe. concatenatum Pits not in longitudinal rows........ 15la. Oe. concatenatum f. hutchinsie Pits in vertical and transverse rows.151b. Oe. concatenatum var. rectangulare 226: Oosporetibbed)...52.. ..anec eee ee 152. Oe. hunt 220 OOsSporerechinate a4. ee ea eee sOe ee 153. Oe. hispidum 226. “@ospore: dentatesis ca.n6 cca ieees be ene 227 Oogonitumit/7—60_ x 48-0355. eee ee eee 154. Oc. cleveanum Oogonium 39-46u X 40-47u............ 154a. Oe. cleveanum f. exoticum 228% Division ooogzonium median epereace eee eee oon eee 229 228... Division of oosonitim supramedian=e shee eee eee eee 233 228. Division of OOgOnitim intramediansers.s- eee eee ener 236 228: Division of OO goniumisipentOne= ane nee eee eee eer rr 240 228. . Division of oogonium"suprenie}.. 24st fate oe ee ee ee 261 tSome forms of Oe. ciliatum may be sought here. 229. 229. 231. 231. 231. 231. 231. 231. 231. 233. 233. 235. 235. 237. 237. 239. 239. 241. 241. 243. 243. 245. 245. 247. 247. 249. 249. 249. 251. 251. OEDOGONIUM 63 Ooconmmponeuiucinalllliyyolicatesa. ti. son 1c 2 lee Saale ee Dl baie hems a 230 Ooconim mnotoneitudinaliyiplicatey.s.22 0: eesti. cose ee Weekes os 231 230. Diameter of oogonium 16-18u...233a. Oe. crenulatum var. gracilius* 230.° Diameter of oogonium 25-27yu............... 233. Oc. crenulatum* Diameter of oogonium 13-16yu..................... 168. O6c. longicolle Diameter of oogonium 16-20u......... 168a. Oe. longicolle var. senegalense Diameter.otoogonium 21—26u. <)...2n.caadese ss 169. Oe. rothi DicinCtCMmOmOOR OMIM ali rane cet eee es Sale OOS e ei aol ees 232 Diameterof oogonium 80-380.......02..5..5..2.25- 171. Oc. decipiens Diameter of oogonium 39-46yu...................-. 172. Oe. macrospermum Diameter of oogonium 89-l0Op.> 22.2... 0.56... ee 162. Oe. perspicuum 232. (Gynandrosporous............:. 232. .171c. Oe. decipiens var. bernardense lidioandrosporotises aq se = eee 171b. Oe. decipiens var. africanum Ooconitumywith verticillatefoldss5.scc0s ciaslse eee hans fone melons dee 234 Ooromumawithoutvertiedlatetolds.,....:.20 22 .1cs8s 2) uss eet eee 235 234. Diameter of oogonium 23-28y..:.-.......... 229. O6c. plicatulum* 234. Diameter of oogonium 50-55u............... 173. O6c. costatum 234. Diameter of oogonium 58-65u............... 174. Oe. boreale Vegetative cell 4-7u in diameter.................. 170. O8c. danicum Vegetative cell 13-24 in diameter................ 175. Oc. mirandrium Ue MOUC CMM ADIGE... 1)lac acute oe bee pene Seno cats wehbe ks as a Seas 237 250- eOOSOMTIM NO pPlicates.c.cas asses Bose 176. Oc. contortum SLE aBiili Rovigie Gell eal etetars koe wee a een eUNy, EY ce ROL Lh Oe a RP 238 RnR eel! MOMeMIALCCE oc nc. <2 Ses pas ad'y os Ae Ra eedes, oh bs GELS A 239 238. Diameter of oogonium 28-26u............... 232. Oc. pulchrum* 238. Diameter of oogonium 28-32u...167b. Oe. platygynum var. continuum Qogenuim 16—73u in diameter... . 0.2... eas see 230. Oc. lagerstedtir* Ooronium 25-29 en diameter. 5... ces. .:.. . meee 231. Oc. uleanum* BA) See © OSPOLEEW AU GSIN OO LINN eh aiiaita ccc eles ta's < FAIRE ea de ey nt Re ieee elas 241 2AOe sOospore wall pittediass oc acusicehsclsls este one etre 177. Oe. schmidlei 240: Oospore wall echinate. 655..02.5. 0055 ce8: 212. Oc. velatum* PA ee Oosporenwalliscnopiculates. spate s.ccc awe eels emcee = 258 Vegetative cell 83-8u in diameter.............. Fs SI Sle Cars Os Oe 242 Mexetative.celliS—o2ustmyaiameter...< 66.5 dees sisrdbnnne serene Gees wed won 245 22 Diameter, of OOgOmImML4 D0 py. ioe. o 2 sae, sah sos ei oeta ns ae elaesc 243 242. Diameter of oogonium 19-23y...179b. Oe. rugulosum f. rotundatum Ocsporesl5—20n ini len oth yr. loko otale ava dissa SMe meee ook Lela Eee Cee 244 Wospore 19—-25pcndlensth. 4.05 65.265 laa ve eas 179. Oe. rugulosum 244. Oogonium ovoid to ellipsoid................ 178. Oe. longatum 244. Oogonium obovoid to ovoid-ellipsoid, 179a. Oe. rugulosum f£. minutum @psporeesloboseyonsubelObOSe keane seen en ns, SI ts wee 246 Waspareciipsoid or Subellipsoid.. F200 6 case asc scans dees oes. sb asi 253 Peet LOI mee IN eOIALO CMs te. cn aGe oe olticls nis MEMEO eee lA aa eh wa ok 247 re pesuiutliatya Cell dot enlareed. 2 .icnn.cos = - eAas AA ads wade eee at 248 Diameter of vegetative cell 9-1l5u................. 180. O6e. hians Diameter of vegetative cell 18-20u................ 175. Oc. mirandrium 248. Vegetative cell 34 to 24% diameters long....................0.00:- 249 248. Vegetative cell 2 to 3 diameters long, ; 184e. Oe. macrandrium var. hohenackerit 248. Vegetative cell 214 to 6 diameters long...................2.00005- 250 248. Vegetative cell 6 to 14 diameters long....... 181. O8c. hoersholmiense Diameter of vegetative cell 12-14u................ 182. Oc. laetevirens Diameter of vegetative cell 13-2lu....184c. Oe. macrandrium f£. lundense Diameter of vegetative cell 21-29u................ 183. Oe. pluviale 2M) ee VEN PLO OOF OMIT DS —A4 in cols arcs aceh ovens die ep aific sb aiele ose biol ebeee os 251 ZOO emsene piso OOSONIMT 44—DOfb- ov. «6 ore siers cio ceils Seine ss man ee 252 Oogonium usually single or in two’s...184d. Oe. macrandriumvar. propinquum Oogonium usually in groups of 2 to 6..184b. Oe. macrandrium f. aemulans Be MOOSPOLe ol —Oieee GOA. = 5 Sica sx oo asi «ing Sa 184. Oe. macrandrium 252. Oospore 35-40 X 36-45y........ 184a. Oe. macrandrium £. acuminatum *See footnote, page 53. 64 253. 253. 255. 255. 255. 257. 257. 259. 259. 261. 261. 263. 263. 265. 265. 267. 267. 269. 269. res Of DOG ONACE EAD Diameter of vegetative cell 7-I2u................. 181. Oc. hoersholmiense Diametenonaecetativie Cel lel4— 32 amt mie set tess en earns 254 2545" Menminailicell’setitorme.... sons ses ol Son Oemcianim D254 herminalkcell notiseuttonmasse nee oe cn ec ere 255 Diameter OMOOSpOLeLZI—O2 Un eee tine aries 207. Oc. flexuosum* Diameterok OoSporeie2=420." ay aon olen ae eer One ere ree 256 Diameter of oospore 41-4802 a= eee eee ate 186. Oc. spectabile 256. ) Viezetauiviercells7¢ to) 3) diameters ong ans ary eee ee eee Zo 256. Vegetative cell 3 to 5 diameters lhevaker ee 3 187. Oc. implexum Oozconium: clobese-obovoidee aaa aes ee 208. Oe. fonticola* Oogonium subglobose. . Sacooogaano slits, (Oke. yolnaualle 258. Diameter of oogonium 30- 39u. Fe cincad sie ead ood in: CO en 259 258 a DiameteromooZonitime40—o0 Lj eeies ee aise ena eee eee 260 258. Diameter of oogonium 56-68u...188b. Oe. monile var. eminens Swrucgbilivonay, Cellll qnbiaawGl ace occ asskaaconsounssaues 188. Oc. monile Suffultory cell not tumid.......:. 184f. Oe. macrandrium var. scrobiculatum 260. Suffultory cell 27—28u in diameter.188c. Oe. monile f. victoriense 260. Suffultory cell 35-884 in diameter.188a. Oe. monile f. borgei Oosporezwall’smooth Gos. sak Ao igs ORES Ce EET are 262 Oospore wall longitudinally ribbed! 225.422 e oe eae 264 262. Diameter of oogonium 30-86y.....:......... 181. Oc. hoersholmiense 2625 Diameter Or ooconitims 42-5511 sn seers eens yarn ae ea 263 262. Diameter of oogonium 55-58u...189a. Oe. obtruncatum var. completum Wenethomoozoniumipb—-O8u-e sae eee ee 189. Oe. obtruncatum Length of oogonium 68-75y...... 189b. Oe. obtruncatum var. ellipsoideum 264, Ribs M-l/anmumbers... - 195b. Oe. acrosporum var. bathmidosporum 264%) JRibst23—380)dnlaamalbberye cfr acrec sa casts cle ce Oe ae eee nae eine 265 2645) .Rabs40—45 sin numbers. os. ae 193. Oc. tentoriale Vegetative cell 7-8u in diameter...... 195c. Oe. acrosporum var. floridense Veretatnvercelllol2—2ilsinrdianm' eters sacs err eee eee 266 266. Plant usually less than 10-celled.195a. Oe. acrosporum f. boreale 266s eblantusuallly amonresinanel {Celle clearness reer eae 267 Diameter Ofoogonium) Jo-48u.- aes eei 195. Oe. acrosporum Diameter of oogonium 44-56u.........195d. Oe. acrosporum var. majusculum 268; (Oospore wall smoothies hele eee ee ee eee 269 268. Oospore wall punctate.......... 4lce. Oe. fabulosum var. punctatum Vegetative cell 56-70u in diameter.... 41b. Oe. fabulosum var. columbianum Vecetativercelle/0-93 ul inndiametery see: sem cic eee ee ioe tee 270 ZO @ospore globose tovellipsoideee ener eer 41. Oe. fabulosum 270. Oospore subglobose to subcylindrical, 41a. Oe. fabulosum var. maximum *See footnote, page 53. OEDOGONIUM 65 1. Oc. laeve Wittrock. (Pl. XI, fig. 100.) 1874, p. 8; De Toni 1889, p. 35; Hirn 1900, p. 75. Monoecious; oogonium single,* depressed-globose, pore median; oospore depressed-globose, filling oogonium, spore wall smooth; anther- idium in groups of 1—2,* subepigynous, sperm 1; vegetative cell 10-14 20-70u; oogonium 32-38 X 24-30; oospore 30-35 X 23-26u; antheridium 9-10 X9-13y. United States: Illinois, Michigan; France. Originally distributed from France, the species was found subsequently in Illinois and Michigan (Transeau), and the above description is made from the American material. The large oogonium in relation to the diameter of the vegetative cell and the depressed-globose oospores are chief characteristics. t is clearly separated from Oe. curvum, in addition, by the absence of any marked tendency toward irregularly curved filaments. 2. Oe. curvum Pringsheim. (Pl. XI, figs. 103 and 104.) 1858, p. 69, Pl. 5, fig. 3; Hirn 1900, p.'74, Pl. I, fig. 3; Tiffany 1926, p. 99, Pl. III, figs. 25-27. Monoecious; oogonium 1—6, depressed globose, pore median; oospore depressed-globose, filling or not filling oogonium, spore wall smooth; antheridium 1-7, sperm 1; basal cell elongate; filament usually irregularly curved; vegetative cells 5-10X10-40u; oogonium 21-25 18-24y; oospore 19-23 X 14-19; antheridium 6-9 X6—9un. United States: Iowa, Alabama; Germany, Spain, Sweden. This species is to be compared with Oe. cryptoporum below. The irregularly curved filaments, particularly in the region of the antheridia, are usually characteristic. The pore is some- times a little above the median position. : 3. Oe. cryptoporum Wittrock. (Pl. XI, fig. 101.) 1870, p. 119; Hirn 1900, p. 72, Pl. I, fig. 1; P. B. A. No. 1525. Monoecious; oogonium 1, subdepressed-obovoid-globose or sub- depressed-globose, pore median; oospore subdepressed-globose, quite filling oogonium, spore wall smooth; antheridium 1-7, scattered or subhypogynous or subepigynous; sperm 1; vegetative cell 7--10x* 28-60u; oogonium 23-28 X 26-314; oospore 22-27 X 19-21u; antheridium 6-3 7-l 1p. United States: Utah; Austria, Denmark, Norway, Sweden. *Hereafter a numeral (or numerals) only will indicate the number of oogonia and antheridia; thus l=a single oogonium or antheridium and 2-7 means that oogonia (or antheridia) may occur in groups of from two to seven seriate individ- uals. The same applies to androsporangia. 66 THe 10.EDO:COINWACCE AGE 3a. Var. vulgare Wittrock. (Pl. XI, fig. 102.) 1874, p. 7; Wolle 1887, p. 70, Pl. 74, figs. 1 and 2; Oe. cryptoporum Wittr. in Hirn 1896, p. 2; Hirn 1900, p. 73, Pl. I, fig. 2; (?) Oe. spetsbergense Wittr. 1874, p. 37 and mm Hirn 1900, p. 316, Pl. L; fig."322. Smaller; oogonium 1-5; vegetative cell 5-815-48u; oogonium 18-25 X 18-26; oospore 16—-23X15-19y; antheridium 5-7 X9-12u. United States: New Jersey, Michigan, Illinois, Massa- chusetts, Pennsylvania, Utah; Australia; Ko Chang; Ceylon; Austria, England, France, Germany, Italy, Spain, Norway, Sweden. The variety is much more widely distributed and has smaller vegetative cells and shorter oogonia than the species. The small sized filaments with rather depressed-globose oogonia are characteristic. 4. Oe. rufescens Wittrock. (Pl. XI, fig. 105.) 1870, p. 134; 1874, p. 32; Hirn 1900, p. 76, Pl. I, fig. 4; Collins 1909, p. 229; PY Becae Noe o2i: Dioecious, macrandrous; oogonium 1-8, obovoid- or depressed- obovoid-globose, pore median, rimiform; oospore globose or depressed- globose, filling oogonium or nearly so, spore wall smooth; antheridium to 12-seriate; sperm 1; female vegetative cell 8-10X34~-70u, male 7-9 X30-54u; oogonium 22-2422-30u; oospore 21-23X17-22n; antheridium 6-8 X8-12u. United States: Connecticut, Rhode Island, Michigan, [lli- nois, Alabama, Ohio; Austria, Denmark, England, Germany, ' Sweden, Latvia; South Africa. 4a. Var. exiguum (Elfving) Tiffany nov. comb. (Pl. XI, fig. 106.) Oe. rufescens f. exiguum (Elfv.) Hirn 1900, p. 76, Pl. 1, fig. 5; Oe. exiguum Elfv. in Hirn 1895, p. 19. Vegetative cells a little smaller; oospore subdepressed-globose; antheridium 3; vegetative cell 5-9 22-88; oogonium 22—24 x 20-28y; oospore 20-22 17—-23u; antheridium 5X 10-12u. United States: Illinois, Alabama, MiQussissippi; Finland, France; Southern Tibet. ’ 4b. Var. lundellii (Wittrock) Tiffany. (Pl. XI, fig. 107.) 1929, p. 75; Oe. Lundellii Wittr. 1874, p. 32; Oe. Rothit Breb. in Rabenh. Alg. Eur. No. 1374, 1862; Oe. rufescens Wittr. subsp. Lundellii (Wittr.) Hirn 1900, p. 77, Pl. I, fig. 6; Oe. rufescens Wittr. subsp. Lundellii (Wittr.) Hirn f. elongatum Hirn 1900, p. 78, Pl. I, fig. 8; P. B. A. No. 1428. Vegetative cells wider in proportion to oogonium than in type; oogonium depressed-globose; vegetative cell 8-1230-75yu; oogonium 22-25 X 21-27; oospore 19-23 15-22u; antheridium 7-9 X6-12y. OEDOGONIUM 67 United States: Maine, California; Austria, England, Fin- land, France, Germany, Hungary, Sweden. The species and the varieties resemble Oe. cryptoporum (No. 3) except in their dioecious habit and are separated from each other chiefly on the basis of relative dimensions. The varieties are so widely distributed and so uniformly separable from the species that they must be regarded as distinct even though similar. 5. Oe. calcareum Cleve. (Pl. XI, fig. 108.) In Wittrock 1870, p. 185; (?) Vesiculifera compressa Hassall 1845, p. 204, P1. 53, fig. 4; Hirn 1900, p. 78, Pl. I, fig. 9. Dioecious, macrandrous; oogonium | or rarely 2, depressed-globose, with median pore; oospore depressed-globose, filling oogonium, wall smooth; ileal ae to 8-seriate; sperm 1; vegetative cell 11-14X 22-56u; oogonium 27-30 X 21-23; oospore 26- 28 X 20-21; antheridium iI 9— [2p England, Denmark, Sweden, Latvia; South Africa. The filaments of this species are often incrusted with lime. The depressed-globose oospore completely filling the oogonium and the robust appearance of the short-celled vegetative filaments are characteristic. 6. Oece. sociale Wittrock. (Pl. XI, fig. 109.) In Wittr. & Nordst. Alg. Exs. No. 401, 1882; Oe. ochroleucum Kuetz. in Rabenh. Alg. Eur. No. 1280, 1862; Hirn 1900, p. 79, Pl. II, fig. 12. Dioecious, macrandrous; oogonium 1, subglobose, pore median; oospore globose (or subglobose), quite filling oogonium, cell wall smooth; antheridium 1-5, sperms 2 division horizontal; vegetative cell 9- 16X 30-1304; oogonium 30-38 X33- AQu; oospore (26—) 28-35 X 28-35p; antheridium 12-148-1luy. United States: Illinois, Alabama, Mi§ssissippi; British Columbia; Austria, Germany, Sweden, Latvia; India, Tibet, Burma. | The oospore is usually quite globose. It is easily separable from its dioecious relatives by its larger size and by the presence of two sperms in the antheridium. 7. Oe. cymatosporum Wittrock and Nordstedt. (Pl. XII, figs. 112 and 113.) In Wittr. 1870, p. 121; Oe. Magnusii Wittr. in Hirn 1895, p. 11; Hirn 1900, p. 80, IPA THIS reife als Monoecious; oogonium 1 or rarely 2, subdepressed-globose, pore median, rimiform; oospore depressed-globose, filling or not filling oogonium, spore wall of three layers: oute. smooth, middle scrobiculate, Cee 68 THE OEEDOGONIMVCEAE inner smooth; antheridium 1-4, subepigynous, subhypogynous, hypogynous, or scattered; sperm 1; vegetative cell 8-19X32-70n; oogonium 30-40 27—40u; oospore 27-35 X 22-33y; antheridium 7-10 9=1dp: United States: Massachusetts, Mississippi; Austria, England, Finland, France, Hungary, Sweden. This species resembles Oe. magnusit below from which it is distinguished by its monoecious habit, its larger oogonia, and its oospores not usually filling the oogonia. 8. Oe. magnusii Wittrock. (Pl. XII, fig. 115.) 1874, p. 38; Hirn 1900, p. 81, Pl. II, fig. 14; Wittr. and Nordst. Alg. Ex. No. 109. Dioecious, macrandrous (perhaps monoecious also); oogonium 1-3, depressed-globose, pore median, rimiform; oospore depressed- globose, quite filling oogonium, spore wall of three layers: outer layer smooth, middle layer scrobiculate, inner layer smooth; antheridium to 8-seriate, sperm 1; vegetative cell 7-10X 12—40u; oogonium 24-27 X 21-264; oospore 22-25 X 18-23y; antheridium 8-10X5-1 1x. United States: Illinois, Michigan, Massachusetts; British Columbia; Finland, Germany, Sweden. Easily separable from Oe. cymatosporum (No.7). According to Wittrock it is sometimes monoecious. 9 Oe. suecicum Wittrock. (Pl. XII, fig. 116.) 1872, p. 5; 1874, p. 30; West 1891, p. 109, Pl. 18, fig. 2; (?) Oe. trichosporum Itzig. in Rabenh. 1868, p. 426; Hirn 1900, p. 82, Pl. II, fig. 15; Collins 1909, p. 230; Heering 1914, p. 198, fig. 281; Tiffany 1926, p. 89, Pl. V, figs. 57 and 58. Dioecious, macrandrous; oogonium 1, subglobose, pore median; oospore globose, nearly filling oogonium, outer spore wall echinate, inner smooth; antheridium 2-6, sperm 1; basal cell elongate; terminal cell apically obtuse; vegetative cell 9-14 X 30-90; oogonium 32-38 XK 34-41; oospore 30-37 X30-37y; antheridium 10-12 X 13-17. United States: Iowa, Illinois, Massachusetts; Australia; Austria, Denmark, Finland, France, Germany, Latvia, Iceland, Norway, Sweden; British Columbia; South Africa. Qa. Form australe G. S. West. i (Pl. XII, fig. 117.) 1909, p. 45, fig. 6 E. Vegetative cell somewhat larger; spines larger and moré sparse; vegetative cell 14-16X56-80y4; oogonium 40-41 40-414; oospore (without spines) 31-33 X31-33u. Africa: Yan Yean Reservoir, Victoria. The species and the variety constitute the only dioecious macrandrous members of the genus having echinate oospores. OED OGONELUM~ ; 69 10. Oe. varians Wittrock and Lundell. (Pl. XII, fig. 120.) In Wittr. 1874, p. 11; Oe. polymorphum Wolle 1887, p. 73, Pl. LXXIV, figs. 16-19; Hirn 1900, p. 89, Pl. IV, fig. 23; Collins 1909, p. 232; Heering 1914, p. 206, fig. 298; Tiffany 1926, p. 99, Pl. VII, figs. 75 and 76. Monoecious, (or sometimes dioecious); oogonium 1, or rarely more, depressed- or subdepressed-pyriform-globose, pore nearly superior; oospore globose, not filling oogonium, spore wall smooth; antheridium to 9-seriate, scattered; sperms 2, division horizontal; basal cell elongate; terminal cell apically obtuse; vegetative cell 12-16 35-144y; oogonium 34-50 X 34-55; oospore 31-41 X30-41y4; antheridium 11-15X5-7uy. United States: Iowa, New Jersey, Illinois; Patagonia; Austria, Finland, Sweden; South Africa. The typical plants of this species have a nearly superior pore, and the oospore usually does not fill the irregularly shaped oogonium. Transeau has observed both dioecious and monoecious forms from Illinois. -(See also Hirn Joc. cit.). 11. Oc. urbicum Wittrock. (Pl. XII, figs. 118 and 119.) 1874, 13; Oe. tumidulum Pringsh. 1855, p. 158, Pl. 1, figs. 26 and 27; Hirn 1900, p. or. Pl. V, fig. 26. Monoecious; oogonium 1, ellipsoid-globose, pore a little above median or nearly superior; oospore globose, not filling oogonium, spore wall smooth; antheridium few celled; sperms 2, division horizontal; vegetative cell 15-19X40-110u; oogonium 46-55 X58-63u; oospore 33-46 X 33-46u; antheridium 14-16 5-7u. Germany. In general appearance this species is similar to Oe. varians above and Oe. tyrolicum (No. 14). It is distinguished from the former by its size and tendency toward ellipsoid oogonia; from both by the variable position of the pore. 12. Oe. obsoletum Wittrock. (PI. XII, fig. 121.) 1874, p. 9; Oe. vernale Wittr. 1872, p. 1; Hirn 1900, p. 83, Pl. II, fig. 16. Monoecious; oogonium 1, subglobose or subdepressed-globose, pore a little above supramedian; oospore subdepressed-globose, not filling oogonium, spore wall smooth; antheridium 1-3, subepigynous; sperm 1; vegetative cell 9-15X30-75u; oogonium 34-39X34-438u; oospore 30-34 & 28-32u; antheridium 8—9X 12—16uy. United States: Pennsylvania; England, Sweden. Similar to Oe. plusiosporum below and distinguished from it by the usually depressed-globose appearance of the oospore. The oospore of Oe. plusiosporum is more regularly globose and its oogonium is more nearly ellipsoid. 70 Prk OEDOGONTEACE LE 13. Oe. plusiosporum Wittrock. (Pl. XII, fig. 122.) 1874, p. 11; Wolle 1887, p. 72, Pl. 74, figs. 20 and 21; Hirn 1900, p. 84, Pl. II, fig. 17. Monoecious; oogonium 1, subglobose or subellipsoid-globose, with pore a little above median; oospore globose, rarely subglobose, not quite filling oogonium, spore wall smooth; antheridium to 6-seriate; sperm (?) 1; terminal cell obtuse; vegetative cell 12-1924—-77u; oogonium (28-) 34-45 X 35-50; oospore (25—) 80-39 X 30-39; antheridium 12-14 <8-12u. United States: Pennsylvania, New Jersey, California; Colum- bia; British Columbia; Sweden, Finland, Rumania. See Oe. obsoletum above. 14. Oe. tyrolicum Wittrock. (Pl. XII, fig. 123.) 1874, p. 12; Hirn 1900, p. 91, Pl. IV, fig. 25; Heering 1914, p. 206, fig. 299; Collins 1918, p. 65; Tiffany 1926, p. 99, Pl. VII, fig. 77. Monoecious; oogonium 1 (rarely 2), ellipsoid-globose or occasionally obovoid, pore nearly superior; oospore usually globose, not filling oogonium, spore wall smooth; antheridium 1-4; sperms 2, division horizontal; basal cell elongate; terminal cell apically obtuse; vegetative cell 15-24 & 45—-120u; oogonium 45-53 & 57—70u; oospore 40-48 XK 40-48y; antheridium 12-21 9-11y. United States: Massachusetts, Iowa; Austria. Distinguished by its more nearly ellipsoid oogonia and globose oospores. Separated from Oe. varians (No. 10) by its larger dimensions and from Oe. cardiacum var. carbonicum (No. 15c) by its monoecious habit. 15. Oc. cardiacum (Hassall) Wittrock. (Pl. XIII, figs. 124 and 125.) Vesiculifera cardiaca Hass. 1845, p. 203, Pl. 51, fig. 4; Oe. cardiacum Wittr. 1870, p. 135; Oe. lautumniarum Wittr. in Hirn 1896, p. 3; (2) Pringsheimia inaequalis Wood 1872, p. 195, Pl. 18, fig. 1; Hirn 1900, p. 85, Pl. III, fig. 19; Collins 1909, p. 231; Heering 1914, p. 194, fig. 273; Tiffany 1926, p. 89. Dioecious, macrandrous; oogonium usually 1, subglobose to sub- cordiform-globose, with a supramedian pore; oospore globose, not filling the oogonium, spore wall smooth; antheridium 1-10; sperms 2, division horizontal; basal cell elongate; terminal cell apically obtuse; female vegetative cell 18-3060-200u, male 15-25%45-170u; oogonium 48-70 X 58-78; oospore 42-60 X 42-60u; antheridium 15-21 10-14u. United States: Iowa, Illinois, Pennsylvania, Oregon, Ohio, Connecticut; Africa; Paraguay; Ontario; Australia; England, Denmark, Finland, France, Germany, Switzerland, Sweden. OED O'EO NIU M 71 15a. Form interjectum Hirn. (Pl. XIII, fig. 127.) 1900, p. 86, Pl. III, fig. 21. Pore of oogonium more nearly superior than in the type; vegetative cell 19-29 xX 60-190u; oogonium 45-60 X 63-81; oospore 44-58 & 43-58 u. England, Sweden. 15b. Form pulchellum (Hassall) Hirn. (Pl. XIII, fig. 126.) 1900, p. 86, Pl. III, fig. 20; Vesiculifera pulchella Hass. 1845, p. 199, Pl. 50, HISer oe Vegetative cell 25-37 X40-125u; oogonium 57-73 X68-78y; oospore 56-66 X 56-66. England, France. 15c. Var. carbonicum Wittrock. (Pl. XIII, fig. 128-) In Wittr. and Nordst. Exs. 1883; Oe. carbonicum Wittr. 1874, p. 33; Hirn 1900, p. 87, Pl. IV, fig. 22; Tiffany 1926, p. 90, Pl. I, fig. 5; P. B. A. No. 1781. Oogonium 1-2, obovoid to globose-ovoid, pore nearly superior; oospore obovoid-ellipsoid to globose-ellipsoid; female vegetative cell 14-30 X40-200u, male 14-25x40-150u; oogonium 42-56 50-80y; oospore 40-52 X 46-65; antheridium 13-20 X 12-15n. United States: Iowa, Illinois, Ohio; Austria, England, Denmark, Germany, Sweden. 15d. Var. minus Lemmermann. (Pl. XIII, fig. 129.) 1909, p. 191, as v. minor; Heering 1914, p. 194; Tiffany 1926, p. 90, Pl. I, fig. 8. Oogonium and oospore smaller; female vegetative cell 16-28 25-754, male 14-23X25-75u4; oogonitum 30-45X35-50u; oospore 28-42 X 28—40u; antheridium 12- 15 5" —6u. United States: Iowa, Kentucky; Germany. The ‘‘cardiacum’”’ group is rather variable, and the varieties are not always clearly separated. The differentiating characters used in the key are those including shape and size of oospore and relative lengths of vegetative cells. Upon these bases the divisions above seem tenable. See also Oe. glabrum (No. 17). 16. Oe. franklinianum Wittrock. (Pl. XIII, fig. 131.) In Wittr. and Nordst. Alg. Exs. No. 309, 1880; Wolle 1887, p. 89, figs. 7-9 Hirn 1900, p. 88, Pl. II, fig. 18; Collins 1909, p. 231; ae 1914, p. 194; Tiffany 1926, p. 89, Pl. IV, figs. 43-44. Dioecious, macrandrous; oogonium 1, subglobose, with a supra- median pore; oospore globose, almost filling oogonium, spore wall 42 T EO EDO:E ON DAGIE AGE smooth; antheridium 1—4; sperms 2, division horizontal; female vege- tative cell 9-12 X 30—95u, male 8-10 X 25—90u; oogonium 26-31 & 29-41; oospore 24-30 X 24-80u; antheridium 8-9 X 5-7. United States: Iowa, Illinois, New Jersey, Pennsylvania; Brazil; Australia. This species also resembles Oe. cardiacum (No. 15) but is distinguished by its smaller dimensions throughout. 17. Oe. glabrum Hallas. (Pl. XIII, fig. 130.) 1905, p. 408, fig. 18; Hirn 1906, p. 14, Pl. I, fig. 2. Dioecious, macrandrous; oogonium 1 (rarely 2), obovoid, pore superior; oospore globose or subglobose, not filling oogonium, spore wall smooth; antheridium 5-8; sperms 2, division vertical; terminal cell (sometimes the oogonium) broadly apiculate; female vegetative cell 16-26 X 120—240yu, male 21-25 60-150u; oogonium 56-58 X 63-86y; oospore 42-49 X 44-63; antheridium 20-22 7—-9u. Denmark. This species in general appearance is near the ‘‘cardiacum’ group. Its vertical division of the two sperms, the small size of its oospore in comparison to the oogonium, and the uniformly superior pore are characters that identify it and make it tenable as a species. ’ 18. Oc. lautumniarum Wittrock. (Pl. XIV, figs. 132 and 133.) In Wittr. and Nordst. Alg. Exs. No. 7, 1877; Hirn 1900, p. 92, Pl. V, fig. 27. Dioecious, macrandrous; oogonium 1, rarely 2, subobovoid-globose,. pore a little above median (rarely nearly superior); oospore subglobose, or sometimes subangular, filling oogonium, wall smooth, rarely thick- ened; antheridium 1-4; female vegetative cell 16—2240-110u, male 15-20 X 45-1004; oogonium 40-49X45-5lu; oospore 36-46 35-47y; antheridium 14—17 7-10u. British Columbia; Finland, Germany, Sweden, Latvia. This species is separable from the ‘‘cardiacum’’ group largely by the varying position of the oogonial pore (from nearly median to nearly superior) and by a combination of cell sizes and shapes not found in any one of this group. 19. Oe. intermedium Wittrock. (Pl. XIV, fig. 134.) In Wittr. and Nordst. Alg. Exs. No. 708, 1886; Oe. fragile Wittr. in zbid. No. 4, 1877; Oe. vaucherii (Le Cl.) Al. Br. in ibid. No. 14, 1877, and in Rabenh. Alg. Eur. No. 2499, 1877; Hirn 1900, p. 94, Pl. V, fig. 31. Monoecious; oogonium 1, obovoid to obovoid-globose, pore superior; oospore globose or obovoid-globose, filling oogonium or nearly so, spore OEDOGONIUM wo wall smooth and thick; antheridium 1-4, subepigynous or hypogynous or rarely scattered, sperms 2, division horizontal; vegetative cell 15-18 x 45-80yu; oogonium 31-37 X 34—45u,; oospore 30-36 X 33-41; antheridium 14-16 X5-10x. United States: Illinois, Ohio, Mississippi; Austria, Finland, Sweden, Latvia, Germany; India; Siberia. 19a. Var. fennicum Tiffany. (Pl. XIV, fig. 135.) 1929, p. 74; Oe. intermedium Wittr. forma valida Hirn 1900, p. 95, Pl. V, fig. 32; Oe. intermedium Wittr. forma West 1909a, p. 239. Oogonium and oospore considerably larger; vegetative cell 17-19 50-120u; oogonium 388-4642-60u; oospore 35-4035-40u; anth- eridium 13-18 X6-8u. United States: Michigan; Finland; Egypt. Oe. intermedium resembles Oe. fragile (No. 24) in general appearance, particularly those specimens that reach the upper limits of dimensions. It is rather intermediate between Oe. fragile and Oe. globosum (No. 21). Its size and location of antheridia are distinctive characters in this monoecious group with regularly supérior pore. The variety fennicum is larger and its oogonium is not filled by the oospore. 20. Oe. hirnii Gutwinsk1. (Pl. XIV, figs. 136 and 137.) 1896, p. 2, Pl. 5, fig. 1; Hirn 1900, p. 93, Pl. V, fig. 29; West and West 1902, p. 12, Pl. I, fig. 1-3. Monoecious; oogonium 1, subglobose or subobovoid, with superior pore; oospore globose, not filling oogonium, spore wall smooth; antheridium 1-2, subepigynous; sperms 2, division horizontal; vegetative cell (sometimes slightly capitellate) 8-13 28-80u; oogonium 32-37 xX 32-39u; oospore 28-31 X 28-31u; antheridium 8-11 *4-9un. Austria, Ireland. 20a. -Var. africanum G. S. West. (Pl. XIV, fig. 138.) 1907, p. 98; Tiffany 1926, p. 100, Pl. ITI, fig. 24. Oogonium globose to subglobose; antheridium 1-3; vegetative cell, broadly capitellate, 13-15 33-60u; oogonium 39-40 38-40; oospore 33-36 X 33-36u; antheridium 13-14 5-6u. United States: Iowa; Africa. The species is near Oe. globosum below in description, differing in its smaller size and its commonly subobovoid oogonia. The variety africanum is very distinct and is the only poriferous form in the monoecious group of the genus having broadly capitellate cells. 74 tae Om pio Ccon fA Cr we 21. Oc. globosum Nordstedt. (Pl. XIV, fig. 139.) 1878, p. 20, Pl. 2, fig. 16; Hirn 1900, p. 94, Pl. V, fig. 30. Monoecious; oogonium 1, globose or subglobose, pore superior; oospore globose, quite filling oogonium, spore wall smooth; antheridium 1-7, subepigynous or subhypogynous or scattered; sperms 2, division horizontal; basal cell elongate; terminal cell setiform; vegetative cell 10-14 40-954; oogonium 32-40382-46u; oospore 30-387 X28-37y; antheridium 9-12 4—8u. United States: Illinois, Massachusetts; Australia; Greece, Serbia. The relation of this species to Oe. hirnit (No. 20) and to Oe. intermedium (No. 19) is discussed under these latter forms. 22. O68. zigzag Cleve. (Pl. XV, figs. 143 and 144.) In Wittr. 1870, p. 120; Hirn 1900, p. 101, Pl. VII, fig. 42. Monoecious; oogonium 1, globose or obovoid-globose, pore superior; oospore of same form as oogonium and quite filling it, spore wall smooth, thick; antheridium 1, subepigynous or subhypogynous, alternating with oogonium and vegetative cell; sperms 2, division horizontal; basal cell elongate; terminal cell apically obtuse; vegetative cell 15-20 30-80p; oogonium 45-63 52-63 (—67)u; oospore 43-60 (44—) 48-58 (-63)y; antheridium 15-19 8—15uy. Sweden. The short, few-celled filaments of Oe. zigzag are quite unmistakable. It bears some resemblance to the dioecious Oe: alternans (No. 139) and is perhaps closely related to Oe. curtum (No. 23). From the latter it is distinguished by its shorter filaments, by its single oogonium, and by its single antheridium alternating with a vegetative cell. 23. Oe. curtum Wittrock and Lundell. (Pl. XV, fig. 149.) In Wittr. 1870, p. 121; Oe. curvum Pringsh. in Roumeguere Alg. Exs. No. 793; Hirn 1900, p. 102, Pl. VI, fig. 41; Skuja 1927, p. 98, Pl. II, fig. 11. Monoecious; oogonium 1-4, obovoid-globose or subglobose, pore superior; oospore of same form as oogonium, which it nearly fills, spore wall smooth, often thick; suffultory cell occasionally larger than vegetative cell; antheridium 1-4, subepigynous, sometimes terminal; sperms 2, division horizontal; basal cell elongate; vegetative cell 12-22 25-110; oogonium 38-55 X 37-54; oospore 36-52 X 35-51; antheridium 10-17 X8-l3p. Finland, Germany, Sweden, Latvia. Similar to Oe. zigzag (No. 22). Skuja (1927) reports Oe. curtum with 10-12 cells (and often 20) in a filament. Oe. OEDO GON LUM ax On zigzag rarely has more than 6-8 cells in the filament. Skuja (1927) also records the membrane of the vegetative cell as being spirally punctate. 24. Oc. fragile Wittrock. (Pl. XV, fig. 145.) 1870, p. 120; 1872a, p. 24; Wolle 1887, p. 71, Pl. 74, figs. 4-6; Oe. Candollei (Le Cl.) Breb. in Roumeguere Alg. Exs. No. 347; Hirn 1900, p. 96, Pl. V, figs. 33 and 34; Collins 1909, p. 232, fig. 81; Heering 1914, Pl. IV, fig. 36; P. B. A. No. 1477. Monoecious; oogonium 1, globose or subobovoid-globose, with superior pore; oospore globose, filling oogonium, spore wall smooth; antheridium 1-8; sperms 2, division horizontal; basal cell elongate; vegetative cell 12-17X50-120u; oogonium 42-5044-55yu; oospore 39-46 X 39—-46u; antheridium 12-15 10—-12u. United States: Iowa, Illinois, Mississippi, Massachusetts, Pennsylvania, Michigan; British Columbia; Patagonia; South Africa; Australia; France, Finland, Sweden, Latvia. 24a. Var. abyssinicum Hirn. (Pl. XV, fig. 147.) 1900, p. 97, Pl. VI, fig. 35. Oogonium smaller than the type; antheridium to 6-seriate; veg- etative cell 12-17 X 25-100; oogonium 38-45 X 40—50y; oospore 36-43 X 36-44; antheridium 11-15x6-14uy. Africa. 24b. Var. robustum (West and West) Tiffany nov. comb. (Pl. XV, fig. 146.) Oe. zigzag Cleve var. robustum West and West 1903, p. 36; zbid. in West 1904, p. 60, fig. 12B; cbid. in Hirn 1906, p. 24, Pl. I, fig. 3. Oogonium usually globose; antheridium 2; vegetative cell 19-23 40—90u; oogonium 53-58 X50- 60u; oospore 51— 56X47- ues antheridium 19 5-7. England. Oe. fragile is characterized by its usually globose spores completely filling the oogonia, its size, and monoecious habit. Cf. Oe. globosum (No. 21) and Oe. intermedium (No. 19). The variety abyssinicum is more slender and has a larger number of seriate antheridia than the species. Variety robustum 1s considerably larger than either. The latter was. originally described by W. and G. S.- West as a variety of Oe. zigzag (No. 22). Its pluricellular habit and number of antheridia place it outside the few-celled zzgzag. Its globose oospore completely filling the oogonium and its subepigynous and subhypogynous antheridia are characters that seem nearest to Oe. fragile. 76 THE (OF Diode ON Ge Ace 25. Oe. vaucherii (Le Clerc) Al. Braun; Wittrock. (Pl. XV, figs. 150 and 151.) (2?) Prolifera vaucherii Le Cl. 1817, p. 474, Pl. 23, fig. 4; (?) Oe. vaucheriti Braun 1855, p. 40, Pl. 2, fig. 13; Wittr. 1870, p. 121; (2?) Oe. diandronites Carter 1858, p. 31, Pl. 3, figs. 8, 9-11; (?) Oe. monandronites Carter 1858, p. 38; Hirn 1900, p. 97, Pl. VI, fig. 36; Oe. vauchertt (Le Cl.) Al. Br.; Wittr. f. msulare Hirn 1900, p. 99, Pl. VI, fig. 37; Collins 1909, p. 232; Heering 1914, p. 207, fig. 308; Tiffany 1926, p. 100, Pi IVG ietoorr eb aeAcwNO@ssliZiaG: Monoecious; oogonium 1, obovoid to subovoid-globose, pore superior; oospore globose to subglobose, not filling oogonium, spore wall smooth and sometimes thick; antheridium 1-4; sperms 2, division horizontal; basal cell elongate; vegetative cell 20-30 X 32-118; oogonium 40-58 X 45-65; Oospore 35-54 35—-55u; antheridium 17-380 6-L5uy. United States: Massachusetts, Michigan, Iowa, Illinois, Ohio, Mississippi; India; Denmark, France, Germany, Switzer- land, Italy, Sweden, Latvia. Oe. vaucherii resembles Oe. intermedium (No. 19) and Oe. fragile (No. 24). Hirn’s f. insulare is not distinct and is included with the species. The dimensions given above include the variations observed for the American material. 26. Oe. richterianum Lemmermann. (Pl. XVI, fig. 156.) 1895, p. 26, figs. 1-3; Oe. paludosum (Hass.) Kuetz. in Hirn 1895, p. 14; Hirn 1900; p. 117, Pl. XII, fig. 63. Monoecious; oogonium 1-2, obovoid or subellipsoid, pore superior; oospore subobovoid or subellipsoid (rarely globose-ellipsoid), filling oogonium or not, spore wall smooth; antheridium 1-6, subhypogynous or subepigynous or scattered; sperms 2, division horizontal; basal cell elongate; vegetative cell 12-21 36-1264; oogonium 36-48 X48-74u; _ oospore 35-43 X438-59u; antheridium 12-15 6-10x. United States: Massachusetts; British Columbia; Germany, Finland: Distinguished by its combination of dimensions and by the horizontal division of the antheridium. Cf. Oe. upsaliense (No. 29). 27. Oe. pseudoboscii Hirn. (Pl. XX, fig. 186.) 1900, p. 291, Pl. XIII, fig. 67; Oe. neglectum Hirn 1895, p. 21, Pl. 1, fig. 1; Silf- venius 1903, p. 15, fig.; Iwanoff 1901, p. 48; Hirn 1906, p. 48, Pl. II, fig. 6. Monoecious; oogonium 1, subobovoid, pore superior; oospore ellipsoid-ovoid or ellipsoid, inflating lower part of oogonium, otherwise not filling it, spore wall smooth; antheridium 1-2, subepigynous; sperms 2, division horizontal; vegetative cell 8-14 x 64-275; oogonium 41-50 X 75-105u; oospore 38-45 48-60u; antheridium 11-12 10-L1uy. United States: Illinois, Alabama, Massachusetts; Finland, Russia. OEDOGONIUM 77 Iwanoff and Silfvenius (/oc. cit.) both found material of this species which proved it to be monoecious and not dioecious (Hirn 1900, 1906). It is characterized by the relatively short oospore within a much longer oogonium. The diameter of the oospore is such that the lower part of the oogonium is really inflated. It bears some resemblance to Oe. paludosum (No. 53) and Oe. boscit (No. 55). From both it is distinguished by its smooth oospores. It is unlike Oe. bosci in its monoecious habit. 28. Oe. sodiroanum Lagerheim. (Pl. XVI, figs. 153 and 154.) 1890, p. 81; Hirn 1900, p. 118. Monoecious; oogonium 1, ellipsoid-obovoid, pore superior; oospore ellipsoid, not filling oogonium at upper end, spore wall smooth; antheridium subhypogynous or subepigynous or scattered, 1-9; sperms 2, division vertical; vegetative cell 20-2444-84y; oogonium 40-45 70-90u; oospore 38-42 x 56-64; antheridium 20-22 6-8u. United States: Michigan; Ecuador. This species originally described incompletely from Ecuador by Lagerheim was collected nearly forty years later in Michigan by Miss Alma B. Ackley. The above description is based on the Michigan material. There can be no question of the validity of the species. It resembles in general appearance Oe. oviforme (No. 30), Oe. upsaliense (No. 29), and Oe. richtertianum (No. 26). It is readily distinguished from these (Cf. No. 29) in dimensions and habit. The antheridia occur in series and when present at the end of the filament give the plant a curved appearance, not unlike that of the androsporangial filaments of Oe. spectabile (No. 186). 29. Oe. upsaliense Wittrock. (Pl. XVI, fig. 157.) 1870, p. 125; 1872a, p. 22; 1874, p. 14, Pl. I, fig. 4; Oe. tumidulum (Roth) in Areschoug Alg. Exs. No. 236, 1864; Hirn 1900, p. 115, Pl. XII, fig. 60; Wittr. and Nordst. Alg. Exsicc. No. 18; P. B. A. No. 1576: Monoecious; oogonium 1, obovoid or suboblong-ellipsoid, pore superior; oospore same form as oogonium (which it fills), spore wall smooth; antheridium 1-3, subhypogynous; antheridium, oogonium, and vegetative cell alternating; sperms 2, division vertical; vegetative cell varying much in same filament; suffultory cell up to 27u in diameter; basal cell elongate; terminal cell obtuse; vegetative cell 13-20 * 55-160y; oogonium 45-50 x 66—-100u; oospore 42-47 x 60-75u; antheridium 15-18 x 7-10n. United States: Michigan, New Hampshire, Ohio, Illinois; Greenland; France, Germany, Sweden, Latvia. TA Ee OF DOiGONDAC EAE “I 0.6) 29a. Var. fennicum Hirn. (Pl. XVI, fig. 158.) 1895, p. 14; 1900, p. 116, Pl. XII, fig. 61. Oogonium and oospore larger, ellipsoid; vegetative cell 13-20 55-175u; suffultory cell 25-33x40-66u; oogonium 63-68 X75-85y; oospore 61-64 X 70-78y; antheridium 15-20 8-13yu Finland. This smooth-spored species is one of a few in the genus combining the monoecious habit with the tendency toward ellipsoid oogonia. It is distinguished from Oe. oviforme (No. 30) by its slightly smaller size, its varying diameter of vegetative cell, and by the rather characteristic alternation of antheridium, oogonium, and vegetative cell in the filament. Oe. sodiroanum (No. 28) is smaller and has shorter vegetative cells. Oe. upsaliense bears some resemblance to Oe. richterianum (No. 26) but in the latter the sperms result from a horizontal division of the antheridium, not a vertical division. The variety fennicum has much larger oogonia and antheridia. The smaller suffultory cell is usually characteristic of both the species and the variety. 30. Oe. oviforme (Lewin) Hirn. (Pl. XVI, fig. 152.) 1900, p. 116, Pl. XII, fig. 62; Oe. urbicum Wittr. var. oviforme Lewin 1888, p. 17, Pl. 2, fig. 48; Heering 1914, p. 210, fig. 308; Tiffany 1926, p. 100, Pl. VIII, figs. 78 and 79. Monoecious; oogonium 1, obovoid to ellipsoid-obovoid, pore superior; oospore obovoid to ovoid (rarely almost globose), filling or not filling the _ oogonium, spore wall smooth, thick; antheridium 1-4, epigynous, hypogynous, or scattered; sperms 2, division vertical; basal cell elongated; vegetative cell 15-23X40-135u4; oogonium 48-55 xX (56-) 65-80u; oospore 46-53 X 50-63u; antheridium 16-19 X 7-12uy. United States: Iowa; Spain. The material distributed from Spain shows a more uniformly obovoid oogonium than is common in the Iowa samples: the latter approach the ellipsoid-obovoid variation. Cf. Oe. upsal- zense (No. 29). 31. Oc. geniculatum Hirn. (Pl. XVI, fig. 155.) 1900, p. 106, Pl. VIII, fig. 48; P. B. A. No. 411. Monoecious; oogonium 1, obovoid or obovoid-globose, pore superior; oospore globose or subdepressed-globose, not filling oogonium, spore wall smooth and thick; antheridium 1—5, subepigynous or subhypogy- nous or scattered, sometimes alternating with vegetative cells; sperms (?) 2, division (?) horizontal; vegetative cell 37-48 X 60-135; oogonium 56-63 X 56-684; oospore 48-59 X48—59u; antheridium 37-44 X5—-Qup. OEDOGONIUM 79 United States: California. This species is near Oe. capilliforme (No. 387) and Oe. anomalum (No. 40). It is larger than either and has somewhat larger oogonia 1n proportion to the size of the vegetative cells than is the case in Oe. anomalum. The peculiar curvature (from which the specific name is derived) of the filaments, due to the opening of the antheridia, is usually characteristic of. the species. 32. Oe. suboctangulare West and West. (Pl. XVII, fig. 160.) 1902; ps 129) Pl. 17, figs. land 2; Hirn 1906; p. 23, Pl. I, fig. 4: Monoecious; oogonium 1, longitudinally rectangular in optical section, broadly inflated, membrane 3.4-3.8u4 thick, yellow, pore superior; oospore subrectangular-ellipsoid, filling oogonium except at the corners; antheridium 2, scattered; vegetative cell 50-54 & 175-240y; oogonium 53-67 X 82-92u; oospore 50-60 X 73-85y; antheridium 41-48 x 25-27 u. Ceylon. The rectangularly appearing oogonium slightly exceeding the vegetative cells in diameter is a distinctive characteristic. 33. Oe. martinicense Hirn. (Pl. XVII, fig. 159.) 1900, p. 134, Pl. XVI, fig. 92; Oe. crassum (Hass.) Wittr. in Wolle 1887, p. 74, Pl. 76, figs. 2 and 3; Collins 1909, p. 240. Monoecious; oogonium 1, obovoid or subobovoid, pore superior; oospore obovoid or obovoid-ellipsoid, quite filling oogonium, spore wall smooth, often thick; antheridium 1—5, hypogynous; sperms 2, division vertical; vegetative cell 33-37115-240u; oogonium (63—)68-74 x 96-125; oospore 66-72 X 81—-96y; antheridium 33-35 X 5-7u. United States: Iowa, Kansas; Island of Martinique. In appearance this species resembles Oe. landsboroughi (No. 48) or Oe. crassum (No. 49), both of which, however, are dioecious. 34. Oc. kurzii Zeller. (Pl. XVII, fig. 163.) 1873, p. 189; 1873a, p. 189;'Hirn 1900, p. 1385, Pl. XVI, fig. 93. Monoecious; oogonium 1, rarely in series, obovoid or subellipsoid, pore superior; oospore subglobose or ellipsoid, not filling oogonium, spore wall smooth; antheridium hypogynous or scattered, to 15-seriate; sperms 2, division vertical; terminal cell apically obtuse; vegetative cell 44-5290-250u; oogonium 70-95X111-130u; oospore 67-86 80-93; antheridium 44-52 X 6-16y. United States: Pennsylvania, Arkansas, Mississippi; India. SO THE ORDO GCONTNCEE This species is quite easily recognized by its monoecious habit, large size, and subglobose to ellipsoid oospores not filling the oogonia. 35. Oe. capillare (Linnaeus) Kuetzing. (Pl. XVIII, figs. 164 and 165.) Conferva capillare L. 1753, 1166; Oe. capillare Kuetz. 1843, p. 255, Pl. 12, fig. II, 1-10; Kuetz. 1853; p. 18, PDL. 40, fig. 3; Oe. capillare Kuetz. var. flavescens in Rabenh. Alg. Europe 1861; Oe. stagnale Kuetz. in Rabenh. ibid. 1883; Hirn 1900, p: 112)-Pl Oct fie. 58: Heering 1914, p. 197, fig. 278; Tiffany 1926, p. ‘Ol, PSE figs. 39 and 40. Dioecious, macrandrous; oogonium 1, not or scarcely exceeding the vegetative cell in diameter, ‘cylindrical to subcylindrical, pore superior; oospore globose to cylindric-globose to ovoid, not or completely filling oogonium, spore wall smooth; antheridium 1-4, often alternating with vegetative cell; sperms 2, division horizontal; basal cell elongate, terminal cell broadly apiculate to obtuse; female vegetative cell 35-56 x 36-120u, male 35-50*35-90u; oogonium 40-6045-75u; oospore 30-52 X 35-65u; antheridium 30-48 X 5-10z. United States: Iowa; Austria, Denmark, Finland, France, Germany, Spain, Italy, Russia, Sweden, Latvia; Africa (Vic- toria). 35a. Form stagnale (Kuetzing; Wittrock) Hirn. (Pl. XVIII, fig. 166.) 1900, p. 113, Pl. X, fig. 57; Oe. stagnale Kuetz. 1849, p. 368, and 1853. p. 13, Pl. 41, fig. 2; Wittrock 1874, p. 31. Oospore subcylindrical or cylindrical-globose, sometimes con- stricted at the middle, not filling oogonium; female vegetative cell 38-50 40-100u, male 35-45x36-90u; oogonium 40-60X55-75y; oospore 36-57 X40-60u; antheridium 33-42 K 5—-9un. Germany, Latvia, Spain. This species and its variety are rather readily distinguished from others by having oogonia which scarcely exceed the vegetative cells in diameter. They are to be compared with Oe. suboctangulare (No. 32) and Oe. geniculatum (No. 31), both of which are monoecious. The variety stagnale 1s separable from the type on dimensions and shape of oogonium. 36. Oc. plagiostomum Wittrock. (Pl. XIV, fig. 140.) Oe. sp. Wittr. 1872a, p. 24, Pl. 1, fig. 11; Wittr. 1874, p. 41; Hirn 1900, p. 100, Pl. VI, fig. 39; Collins 1918, p. 62; Heering 1914, p. 196, fig. 276; Tiffany 1926, p. 92. Dioecious, macrandrous; oogonium 1, obovoid-globose, with superior pore; oospore globose to subglobose, usually filling oogonium, spore wall smooth and thickened; antheridium 1-6, often alternating with vegetative cell; basal cell elongate; vegetative cell 22-27 65-120y; oogonium 42-49 x 50-60u; oospore 41-47 KX 42-49; antheridium 20-24 8—10u. OEDOGONIUM S1 United States: Illinois, Massachusetts, Iowa, Ohio, Missis- sippi; Denmark, Sweden; India; South Africa. 36a. Var. gracilius Wittrock. . (Pl. XIV, figs. 141 and 142.) 1878, p. 142; Hirn 1900, p. 101, Pl. VI, fig. 40; Collins 1909, p. 233; Tiffany 1926, Pl. IV, figs. 37 and 38. : Smaller than the type, with vegetative cell usually shorter; vegetative cell 20-25%X40-100u; oogonium 36-4246-57u; oospore 34-39 36—-44y; antheridium 19-22 7-10uz. United States: Iowa, New York, Illinois, Ohio, Mississippi; Germany; Mexico; South Africa. The species and variety are separated mainly on the basis of size. The rather regularly globose oospores, with heavy walls, within obovoid-globose oogonia are characteristic. 37. Oc. capilliforme Kuetzing; Wittrock. (Pl. XIX, figs. 172 and 173.) ; Kuetz. 1853, p. 12. Pl. 37, fig. 3; Wittrock 1872a, p. 21; 1874, p. 31; Oe. dioicum Petrovsky 1861, p. 611, Pl. 13, fig. 6-10; Hirn 1900, p. 107, Pl. VIII, fig. 49; Collins 1909, p. 234; Heering 1914, p. 196, fig. 282; Tiffany 1926, p. 92, Pl. III, figs. 22 and 23. Dioecious, macrandrous; oogonium 1, obovoid to subovoid, with superior pore; oospore variable, ovoid-globose, cylindric-globose, sub- globose, or globose, not filling oogonium, spore wall smooth; antheridium 2-8, often alternating with the vegetative cell; sperms 2, division horizontal; basal cell elongate, terminal cell apically obtusé or apiculate; female vegetative cell 28-38 X 42-120, male 25-30 x 40-100y; oogonium 42—50 X 51—62yu; oospore 37-45 X 40—50y; antheridium 20-25 x 8-10u. United States: Missouri, Iowa, Ohio, Mississippi, Illinois; France, Russia, Sweden; Patagonia; 8. Africa. 37a. Form debaryanum (Chmielevsky) Hirn. (Pl. XIX, fig. 174.) 1900, p. 108, Pl. VIII, fig. 50; Oe. De Baryanum Chmiel. 1889, p. 1, Pl. 1, figs. 1 and 2; Tiffany 1926, p. 92, Pl. III, figs. 20 and 21. Oospore globose or subglobose; female vegetative cell 25-37 38-130u, male 22-27X35-100u; oogonium 46-56 52-66yu; oospore 38-50 X40-53u; antheridium 18-24 5-10u. United States: Iowa; Greenland; Russia. 37b. Form lorentzii (Magnus and Wille) Hirn. (Pl. XIX, fig. 175.) 1900, p. 109, Pl. IX, fig. 51; Oe. lorentzii Magnus and Wille in Wille 1884, p. 51, Pl. 3, figs. 99-101. Oogonium obovoid to obovoid-globose; oospore usually globose” or subglobose, sometimes cylindric-globose; female vegetative cell, 26-34 x 82 TE AOE DOG ON TAGS Aue 25-100u, male 24-3025-90u; oogonium 40-53X40-65u; oospore 37-47 X 38-54; antheridium 22-30 5-10y. Uruguay. 37c. Var. australe Wittrock. (Pl. XIX, figs. 176 and 177.) In Wittr. and Nordst. Exs. 1886; Oe. princeps (Hass.) Wittr. in Tilden Amer. Alg. 1894; Hirn 1900, p. 109, Pl. IX, fig. 52; Oe. capilliforme Kuetz.; Wittr. var. australe Wittr. f. uberosporum Hirn 1900, p. 110, Pl. 1X, fig. 538; Tiffany 1926, p. 92. Oogonium obovoid-globose to subglobose; female vegetative cell 24-36 X 26-100u, male 22-33x40-100u; oogonium 37-53 X43-60y; oospore 35-50 X 36—55yu; antheridium 21-26 X4-9u. United States: Minnesota, Iowa, New York, South Dakota, Nebraska, California; Africa; Uruguay, Argentine, Brazil; Mexico; Vancouver. 37d. Var. diversum (Hirn) Tiffany. (Pl. XIX, fig. 178.) 1929, p. 75; Oe. capilliforme Kuetz.; Wittr. var. australe Wittr. f. diversum Hirn 1900, p. 110, Pl. IX, fig. 54; Oe. stagnale Kuetz. in Tilden Amer. Alg. 1896. Dimensions larger throughout; female vegetative cell 34-46 45-130u, male 33-4050-120u; oogonium 46-56X46-70u; oospore 43-52 x 40-58; antheridium 30-37 X 6-I1y. United States: Iowa, Colorado, Montana, Minnesota. The “‘capilliforme’’ group is readily recognized by the smaller male vegetative filaments and shape of oogonia. The group is variable within itself, however, and the above varieties are recognized on the basis of differences in shape of oogonia and in dimensions. 38. Oe. princeps (Hassall) Wittrock. (Pl. XVIII, figs. 167-169.) Vesiculifera princeps Hass. 1842, p. 388; V. cupillaris Hass. 1845, p. 195, Pl. 50, figs. 1 and 2; Oe. princeps Wittr. 1874, p. 42; Hirn 1900; p. 289, Pl. X, fig. 56. Dioecious, macrandrous; oogonium 1, little tumid, subobovoid, pore superior; oospore globose or subglobose, not filling oogonium, spore wall smooth; terminal cell apiculate; antheridium 1-7; vegetative cell 33-42 X 40-1334; oogonium 54-63X67-80u; oospore 48-58 x 50-60y; antheridium 32-38 8—20u. United States: Minnesota, Mississippi; England. I have seen specimens of this alga from both Minnesota and Mississippi with immature antheridia which appear to belong with the oogonial filaments. I have therefore placed the species in the dioecious group. The cells of the antheridial filaments are somewhat longer than those of the male plants. It should be compared with the monoecius Oe. geniculatum (No. 31) and the dioecious Oe. capilliforme (No. 37). It is more robust than the latter. OEDOGONIUM 83 39. Oc. biforme Nordstedt. (Pl. XVI, figs. 161 and 162.) In Wittrock and Nordstedt Exs. 1880; Hirn 1900, p. 147, Pl. XXII, fig. 112. Dioecious, macrandrous; oogonium 1 (rarely 2), pore superior, cylindric-obovoid; oospore oblong-ellipsoid to subglobose or nearly globose, generally not filling oogonium, spore wall smooth; antheridium to 21-seriate; sperms 2, division vertical; female vegetative cell 22-32 55-140u; male 18-28X45-140u; oogonium 37—-5248-90u; oospore 36-48 X 40-70u; antheridium 18-28 x 6-15uy. Brazil, Paraguay, Ecuador. Near Oe. oboviforme (No. 46) and Oe. grande (No. 45); distinguished chiefly by its cylindric-obovoid oogonium. 40. Oe. anomalum Hirn. (Pl. XVIII, figs. 170 and 171.) 1900, p. 112, Pl. X, fig. 55; Oe. stagnale Kuetz. var. variabilis Lewin 1888, p. 17, Me ees: 44-48; Heering 1914, p. 197, fig. 277; Tiffany 1926, p. 91, Pl. I, figs. an C Dioecious, macrandrous; oogonium 1, subovoid or cylindric-ovoid, pore superior; oospore globose or subglobose, not filling oogonium, spore wall smooth; antheridium 4-13, sperms 2, division vertical; terminal cell apically obtuse; female vegetative cell 40-50 80-3800uz, male 33-42x80-240u; oogonium 54-6468—-75u; oospore 48-60 52-61u; antheridium 30-40 6-18u. United States: Iowa; Spain. This species has some of the appearances of Oe. capillare (No. 35), particularly in the relatively small difference between the diameter of the vegetative cells and that of the oogonia. 41. Oe. fabulosum Hirn. (Pl. XXV, figs. 215 and 216.) 900s pe 114s Pl xl fies 595° = Dioecious, macrandrous; oogonium 1, little tumid, cylindrical, pore superior; oospore globose or ellipsoid, not filling oogonium in length, spore wall smooth; antheridium seriate; sperms 2, division vertical; vegetative cell 74-85 115-210u; oogonium 81-96 X 104-133; oospore 75-89 X 78-104; antheridium 68-80 X 7—22z. Brazil. 41a. Var. maximum (West) Hirn. (Pl. XXV, figs. 217 and 218.) 1906, p. 13, Pl. II, fig. 5; Oe. maximum West 1901, p. 75, Pl. IV, figs. 39-41. Oogonium wall thick; oospore subglobose to subcylindrical, filling oogonium or nearly so; basal cell elongate; terminal cell obtuse or broadly apiculate; vegetative cell 70-93 X 105-335yu; oogonium 75-107 X 75-136; oospore 70-100 X65-110u; antheridium 65-86 X 7—20u. Siam (Koh-chang). 84 Tr EOE DOE ON PACES 4lb. Var. columbianum G. S. West. (Pl. XXV, fig. 219.) . 1914, p. 1048, text fig. 3D. Vegetative cell more slender; oogonium a little longer and more tumid; oospore more ellipsoid than the type; vegetative cell 56-70 248-425; oogonium 98-100 X 163-1744; oospore 81-84 X 124-128. Columbia. 4ic. Var. punctatum Lemmermann. 1910, p. 313. Oogonium not tumid; oospore globose, not filling oogonium in length, spore wall yellow-brown, densely punctate; vegetative cell 64-75 210—-245u; oogonium 64-75 101-1184; oospore 63-71 X63-71p. Paraguay. Oe. fabulosum with its three varieties represents the largest size attained by any species of the genus so far recorded. The variety punctatum is easily separable by its punctate oospore, although unfortunately Lemmermann left no figure; colum- bianum is the most slender; maximum is slightly larger than the species. 42. Oe. rivulare (Le Clerc) Al. Braun. : (Pl. XXIV, figs. 209 and 210.) é (2?) Prolifera rivularis Le Cl. 1817, p. 472, Pl. 23, fig. 1; Oe. rivulare Al. Br. 1855, p23, Blanes. IO Sica 1900s plo Bileexchi es O0. Dioecious, macrandrous; oogonium 1-7, obovoid, pore superior; oospore obovoid, ellipsoid, or subglobose, not filling oogonium longi- tudinally, spore wall smooth; antheridium to 13-seriate; sperms. 2, division horizontal; basal cell elongate; female vegetative cell 35-45 xX 110-350pu, male 30-36 X 120-280u; oogonium 70-85 X 130-1604; oospore 55-70 X 65-100; antheridium 21-28 X 14—26n. United States: Iowa, Florida, Massachusetts; Denmark, England, Austria, France, Scotland, Germany, Sweden. Very readily recognized by its large size and particularly by its oospore which is much smaller than the oogonium. 43. Oe. pachyandrium Wittrock. (Pl. XX, figs. 179 and 180.) In Wittr. and Nordst. Alg. Exs. No. 5, 1877; Hirn 1900, p. 142, Pl. XX, fig. 104. Dioecious, macrandrous; oogonium 1-3, subobovoid or obovoid- ellipsoid, pore superior; oospore ellipsoid, not filling oogonium (rarely inflating it), spore wall smooth; antheridium 1-4; sperms 2, division vertical; female vegetative cell 30-36 X 80-220u, male 32-45 x 60-160; oogonium 53-57 X 84—-108u; oospore 51-54 69-85y, antheridium 30-43 X 11-20. United States: Pennsylvania, New Jersey, Massachusetts; Sweden. OEDOGONIUM 85 This plant is very near Oe. grande (No. 45), but is dis- tinguished by having male filaments larger than the female. 44, Oe. mexicanum Wittrock. (Pl. XXI, figs. 188 and 189.) 1878, p. 138; Hirn 1900, p. 147, Pl. XXII, fig. 111. Dioecious, macrandrous; oogonium 1, cylindric-obovoid, pore superior; oospore cylindric-obovoid, quite or nearly filling oogonium; spore wall smooth; antheridium to 8-seriate; sperms 2, division vertical; female vegetative cell 34—41 x 60-140, male 30-38 X 60-1144; oogonium 53-63 X 76— 110u; oospore 51-60 X 63-80yu; antheridium 28-35 X 7-17». United States: South Dakota, Massachusetts; Mexico. This species is close to Oe. grande below, being usually distinguished by its larger and considerably shorter vegetative cells and by its more cylindric oogonia. 45. Oe. grande Kuetzing; Wittrock. (Pl. XXII, figs. 195 and 196.) In Wittr. and Nordst. Alg. Exs. No. 502, 1883; Kuetz. 1845, p. 200, 1853, p. 12, Pl. 37, fig. 1; Hirn 1900, p. 148, Pl. X XI, figs. 105-106; Collins 1909, p. 242; Heering 1914, p. 202, fig. 288; Tiffany 1926, p. 98, Pl. II, figs. 14-16; P. B. A. No. 811. Dioecious, macrandrous; oogonium 1—5, subobovoid, pore superior; oospore of the same form as oogonium, which it completely fills or not, spore wall smooth; antheridium 1—10; sperms 2, division vertical; basal cell elongated; female vegetative cell 28-3770-210u, male 28-33 X 70-1754; oogonium 49-60 86-1104; oospore 47-58 x 60—94y; antheridium 25-33 & 11-18u. United States: Iowa, Maine, Massachusetts, Pennsylvania, California, Michigan, Illinois, Ohio, Minnesota, Mississippi, Connecticut; Ontario; Australia; Austria, Sweden, Switzerland. 45a. Form gemelliparum (Pringsheim) Hirn. (Pl. XXII, fig. 200.) 1900, p. 145, Pl. XXI, fig. 107; Oe. gemelliparum Pringsh. 1858, p. 71, Pl. 5, ae At Oe. landsboroughi (Hass.) Wittr. var. gemelliparum (Pringsh.) Wittr. 1874, p. 36. Oogonium ellipsoid-ovoid, antheridium seriate; vegetative cell 20-27 * 60-200u; oogonium 55-57 & 75—-80p; oospore 49-51 X 65-69. Germany. 45b. Var. aequatoriale Wittrock. (Pl. XXII, fig. 201.) In Wittr. and Nordst. Alg. Exs. No. 1016, 1893; Hirn 1900, p. 145, Pl. X XT, fig. 108; Oe. grande Kuetz.; Wittr. var. aequatoriale Wittr. f. hortense Wittr. in Hirn 1900, p. 145, Pl. X XI, fig. 109. Vegetative cell 26-33 < 70-165; oogonium 44-51 X 75-100u; oospore 42-49 X 50-8 1p. Ecuador; Greenland. &6 Hort OEDO'GCONTACE AE 45c. Var. angustum Hirn. (Pl. XXII, figs. 198 and 199.) 1900, p. 146, Pl. X XI, fig. 110; P. B. A. No. 410. Vegetative cell and oogonium elongated; antheridium to 36-seriate; oogonia sometimes 4; vegetative cell, female 19-3070-330u, male 19-25 X 80-225; oogonium 42-5262-110u; oospore 40-50 60-89y; antheridium 18-22 7—-15u. United States: Massachusetts, Mississippi, Michigan, IIli- nois; Brazil. 45d. Var. majus Hansgirg. (Pl. XXII, fig. 197.) 1886, p. 45; Oe. grande forma robusta Hirn 1900, p. 144; Collins 1918, p. 68; Oe. grande Kuetz.; Wittr. var. robustum (Hirn) Tiffany 1924, p. 186, Pl. III, fig. 7, and 1926, p. 94, Pl. I1, fig. 19. Larger than the type; female vegetative cell 36-46 x 80-200, male 32-42 X 80-2004; oogonium 52-68X75-90u; oospore 50-64 68-88u; antheridium 30-36 X 10—16u. United States: Illinois, Iowa, Michigan, Ohio, Massa- chusetts; Austria, Czecko Slovakia, Latvia. Oe. grande is one of our commonest species. The sub- obovoid oogonia often in series, with superior pore, the accom- panying smaller male filaments with vertical division of the antheridium are distinctive characters. The varieties are distinguished on the basis of size and differences in shape of oogonia. The common occurence of the distinct, robust variety of Oe. grande led to the varietal name robustum (Tiffany 1924). Hansgirg’s description of the variety majus is so near that: given above that the prior name must be used, in spite of its relegation by Hirn (1900) to be synonymous with the robust form of the type. Skuja (1927) records a robust form of Oe. grande with slightly smaller dimensions, which I have included under the variety majus. The dimensions of this variety are from the American material. 46. Oc. oboviforme Wittrock. (Pl. XX, figs. 184 and 185.) 1878, p. 140; De Toni 1889, p. 74; Hirn 1900, p. 141, Pl. XX, fig. 103; Collins 1909, p. 241. Dioecious, macrandrous; oogonium 1, obovoid, pore superior; oospore obovoid (rarely ellipsoid-obovoid), about filling oogonium, spore wall smooth; antheridium to 19-seriate, sperms 2, division vertical ; basal cell elongate; female vegetative cell 21-33 X 72-280; male 21-31 X 72-270u; oogonium 55-65 X80-1074; oospore 54-61X70-85y; anth- eridium 21-28 x 5-13u. Brazil; Mexico. OEDOGONIUM S87 Distinguished from Oe. mexicanum (No. 44) by longer vegetative cells. Its obovoid and slightly larger oogonia usually separate it from Oe. grande, above. 47. Oe. subrectum Hirn. (Pl. XX, figs. 181-183.) 1900, p. 141,'Pl. XX, fig. 102. Dioecious, macrandrous; oogonium 1-2, subellipsoid or obovoid- ellipsoid, pore superior; oospore ellipsoid or globose-ellipsoid, filling or nearly filling oogonium, spore wall smooth, often thick; antheridium to 9-seriate, sperms 2, division vertical; basal cell elongate; terminal cell apically obtuse; vegetative cell, female, 27-35 x 160-340yu, male 26-33 X 104-800u; oogonium 70-83 X 83-1034; oospore 65-80 X 75—-93y; antheridium 22-28 x 8-14. Brazil. Characterized among the species with obovoid-ellipsoid oogonia by its size and the relatively long vegetative cells. 48. Oe. landsboroughi (Hassall) Wittrock. (Pl. XXIV, figs. 211 and 212.) Vesiculifera landsborought Hass. 1842, p. 289, and 1845, p. 197, Pl. 51, fig. 2; Oe. landsborought Wittr. 1874, p. 35; Oe. gemelliparum Pringsh. in Rabenh. Alg. Eur. No. 1118, 1861; Oe. gemelliparum v. majus Wittr. 1870, p. 137; Oe. tumidulum Kuetz. in ibid No. 1468, 1863; Hirn 1900, p. 185, Pls. XVI and XVII, figs. 94 and 95; Collins 1909, p. 241; Heering 1914, p. 200, fig. 285; Tiffany 1926, p. 93, Pl. II, figs. 12,and 13; P. B: A. No. 663: Dioecious, macrandrous; oogonium 1-2, (rarely 3), obovoid to ovoid, pore superior; oospore ovoid to ellipsoid, filling or not filling the oogoni- um, spore wall smooth; antheridium up to 30-seriate; sperms two, division vertical; basal cell elongate, terminal cell obtuse; female vegetative cell 31-40 X90-240u, male 30-37 X120-225u; oogonium 63-78 X85-115y; oospore (55—) 59-70X73-102y; antheridium 27-35 X 9-20u. United States: Iowa, Ohio, Connecticut, Michigan, Massa- chusetts, New York, Mississippi; British Columbia; Paraguay, Uruguay; Mexico; Austria, England, Finland, France, Germany, Norway, Russia, Sweden. 48a. Var. norvegicum Wittrock. (Pl. XXIV, figs. 213 and 214.) In Wittr. and Nordst. Alg. Exs. No. 204, 1879; Oe. landsboroughi var. robustum Wittr. in Wittr., Nordst. and Lagerh. Alg. Exs. No. 1215, 1896; Hirn 1900, p. 137, Pl. XVII, figs. 97 and 98; Tiffany 1926, p. 93. Vegetative cells shorter but of larger diameter; female vegetative cell 38-45 K 60-160u, male 36-45 X 55-135; oogonium 64-73 X 70-105; oospore 60-70 67-90y; antheridium 35-45 x 8—-l5uy. United States: Iowa; Norway; Brazil; Mexico. It is rather difficult to indicate the exact differences between the landsboroughi group and the crassum group in the genus, 88 TT wo OsD:0 COW AC Ey AcE although one can scarcely confuse the two after some familiarity with them. The shape of the oogonia is quite similar in each, but the oospore is perhaps the most distinctive characteristic. The oospore of landsboroughit varies from ovoid to ellipsoid while the oospore of crassum varies from ellipsoid to nearly globose. Globose oospores are never present in Oe. lands- borought. The variety norvegicum has stouter and_ shorter vegetative cells. Compare also with Oe. subrectum (No. 47) and Oe. grande (No. 45). 49. Oe. crassum (Hassall) Wittrock. (Pl. XXIII, figs. 202 and 203.) (?) Vesiculifera crassa Hass. 1842, p. 389; Oe. crassum Wittr. 1872a, p. 20, Pl. 1, figs. 4-6; Hirn 1900, p. 139, Pl. XVIII, fig. 99; Heering 1914, p. 200, fig. 286; Tiffany 1926, p. 93, Pl. II, figs. 17 and 18. Dioecious, macrandrous, oogonium 1-2, ovoid to obovoid-ellipsoid, pore superior; oospore ellipsoid to globose, filling or not filling oogonium, spore walls smooth; antheridium 2-25; sperms 2, division vertical; female vegetative cell 36-50 X 72-340y, male 30-36 X 72-260u; oogonium 60-78 X 85-1204; oospore 58-76 X75—-96yu; antheridium 28-32 X 10—-20uz. United States: Iowa, Florida, Ohio, Michigan, Mississippi, Alabama, Indiana; Austria, England, Germany, Sweden; South Africa. 49a. Form amplum (Magnus and Wille) Hirn. (Pl. XXIII, figs. 204 and 205.) 1900, p. 1389, Pls. XVIII and XIX, fig. 100; Oe. amplum Magnus and Wille in Wille 1884, p. 40, Pl. 2, figs. 65 and 66; Oe. crassum (Hass.) Wittr. in Wille 1884, p. 39, Pl. 2, fig. 64; (?) Oe. rivulare (Le Cl.) Al. Br. var. major Wolle 1887, p. 92, . PIiWGete. (and 8. Of larger dimensions; vegetative cell, female 46-54 70-160u, male 42-5065-200u; oogonium 75-90X83-1154; oospore 72-85X 77-100u; antheridium 40—50 X 8—20u. United States: Ohio, Illinois, Mississippi, (?) Florida, Michi- gan; Uruguay, Brazil. 49b. Var. longum Transéau. (Pl. XXIV, fig. 208.) 1918, p. 237. Elongated oogonium and oospore; vegetative cell, female 40-52 < 100-240u, male 36-44100-180u; oogonium 68-84% 120-180; oospore 66-80 X 100-125; antheridium 34-40 8-14u. United States: New York (Short Point Bay, Oneida Lake). 49c. Var. subtumidum Hirn. (Pl. XXIII, figs. 206 and 207.) 1900, p. 140, Pl. XIX, fig. 101. OED OGONILUM 89 Longer vegetative cells; oogonium and oospore larger than in type; vegetative cell, female 42-50X120-250u, male 40-48X120-240,; oogonium 75-85X96-1374; oospore 67-79X84-100u; antheridium 34-45 X 7-1du. Brazil; South Africa. r For a discussion of the chief characteristics of the crassum group, see notes under Oe. landsborought (No. 48). The variety - amplum is larger than the species proper and has shorter vegetative cells than the variety subtumidum. Fritsch’s form of crassum from South Africa is nearest the variety subtumidum. The variety Jongum is readily characterized by its elongated oogonia and oospores. 50. Oe. exocostatum Tiffany. (Pl. XXVII, figs. 235-237.) 1921, p. 272, Pl. I, figs. A-F, 1926, p. 94, Pl. V, figs. 51-54. Dioecious, macrandrous, oogonium 1-2, ellipsoid to ellipsoid- globose, occasionally terminal, pore superior; oospore of the same form as the oogonium, which it very nearly completely fills, spore wall of two layers: the outer marked by 13-15 longitudinal ribs, inner smooth; suffultory cell swollen; male filament a little more slender than the female, antheridium 3-7; sperms 2, division horizontal; basal cell elongate; female vegetative cell (138—) 18-25 x 72-140, male (13—) 16-20 <48-100u; suffultory cell 22-3060-90u; oogonium 40-52 60-96y; oospore 38-41 X 56-68; antheridium 12-16 X7-12uy. United States: Iowa, Ohio. This species is readily distinguished by the presence of longitudinal ribs on the outer layer of the oospore wall. Other- wise it is similar in appearance to Oe. crenulatocostatum (No. 57). 51. Oc. kjellmanii Wittrock; Hirn. (Pl. XXVI, fig. 223.) 1900, p. 127, Pl. XIV, fig. 82; Wittr. 1880, 71 Wittr. and Nordst. Alg. Exs. No. 306. Dioecious, macrandrous; oogonium 1, cbovoid or rarely subellipsoid, pore superior; oospore ellipsoid or subellipsoid, not completely filling oogonium, spore wall of 3 layers: outer layer internally ribbed, middle layer with 35-45 slightly crenulate longitudinal ribs, anastomosate, inner layer smooth; antheridium to 30-seriate; sperms 2, division vertical; female vegetative cell 15-22 45-120u; male 14-18 56-120y; oogonium 41-50 x 60—75y; oospore 39-47 48-57; antheridium 12-15 X 4—12u. Borneo. Characterized by the large number of longitudinal ribs on the middle layer of the oospore. 90 Tre OE DiO'E ONE NOeRAE 52. Oe. paulense Nordstedt and Hirn. (Pl. XXVI, fig. 224.) In Hirn 1900, p. 292, Pl. XIV, fig. 80; Schmidle 1901, p. 344, Pl. XII, fig. 1; Hirn 1906, p. 45, Pl. II, fig. 5. Monoecious; gogonium 1, subellipsoid or ellipsoid-ovoid, pore superior; oospore ellipsoid, not or quite filling oogonium, spore wall of three layers: outer layer smooth, middle layer with 18-22 longitudinal ribs, entire and sometimes anastomosate, inner layer smooth; antheridium 1-2, subepigynous; sperms 2, division horizontal; vege- tative cell 10-15 X50-120u; oogonium 33-88 X 43-68; oospore 30-36 X 38—45u; antheridium 10-146-S8u. Brazil; Australia. Schmidle’s record of this species from South America definitely placed it in the monoecious group. Its small size and fewer ribs on the oospore are characteristic. 53. Oc. paludosum (Hassall) Wittrock. (Pl. XXVI, fig. 231.) Oe. paludosum Wittr. 1870, p. 124; (2?) Vesiculifera paludosa Hass. 1845, p. 199, Pl. 52, fig. 3; Hirn 1900, p. 120, Pl. XIII, fig. 69; Collins 1909, p. 237. Monoecious; oogonium 1, ellipsoid, pore superior; oospore ellipsoid, filling oogonium, spore wall in three layers: outer and middle layers with 27-35 longitudinal ribs, continuous, rarely anastomosate; antheridium 1-8, scattered, often in the upper part of the filament; sperms 2, division vertical; vegetative cell 15-20 50-140u; oogonium 39-48 X 66-84; oospore 36-45 X 54-63u; antheridium 14-16 6-13u. United States: Illinois, Pennsylvania; British Columbia, Norway, England, Sweden. 53a. Var. americanum Nordstedt. (Pl. XXVII, fig. 233.) In Hirn 1900, p. 121, Pl. XIII, fig. 72; Collins 1909, p. 237. Oogonium larger; vegetative cell 14-23 x 45-156; oogonium 54-63 X 75-90u; oospore 49-57 X 69—75u; antheridium 12-18 X 7—-12u. United States: South Carolina. 53b. Var. parvisporum Hirn. (Pl. XXVI, fig. 232.) 1900, p. 120, Pl. XIII, fig. 70; (2?) Oe. pringsheimiana Archer 1868, p. 295; (?) Oe. archerianum Cooke 1884, p. 157; Borge 1913, p. 63, fig. 1. Oogonium subellipsoid or suboblong-ellipsoid; oospore not filling oogonium; antheridium subepigynous or subhypogynous or scattered; vegetative cell 15-2045-120u; oogonium 38-44X70-86y; oospore 35-41 X 54-60u; antheridium 15-17 X7-12uy. . United States: Illinois, Michigan, Ohio; Spain, Sweden. OEDOGONIUM QO] Oe. paludosum is to be compared with Oe. boscii (No. 55) from which it differs in being monoecious. The two varieties are distinguished chiefly by relative sizes and by differently shaped and incompletely filled oogonia. 54. Oc. leiopleurum Nordstedt and Hirn. (Pl. XXVI, figs. 221 and 222.) Rat Hirn 1900, p. 126, Pl. XIV, fig. 79; Oe. kjellmaniw Wittr. in Nordst. 1888a, p. 196. Dioecious, macrandrous; oogonium 1-4, obovoid (or ellipsoid- obovoid) or subellipsoid, pore superior; oospore obovoid-ellipsoid or subellipsoid, usually filling oogonium, spore wall in three layers: outer and middle layers with 26-80 longitudinal ribs, entire, sometimes anastomosate, inner layer smooth; antheridium to 24-seriate, sperms 2, division horizontal; basal cell elongate; terminal cell apically obtuse; female vegetative cell 15-2545-170u, male 15-17 X45-85y; oogonium 40-51 X 65-83; oospore 39-49 X50-68u; antheridium 15-17 X7-15u. Africa. To be compared with Oe. boscii below. Its large number of seriate antheridia and usually completely filled oogonia are characteristic. 55. Oe. boscii (Le Clerc) Wittrock. (Pl. XXVI, figs. 225 and 226.) 1874, p. 34; (2?) Prolifera Boscii Le Clerc 1817, p. 474, Pl. 23, fig. 5; Conferva vesicata Ag. in Desmaz. Exs. 1845; Hirn 1900, p. 122, Pl. XIII, fig. 73; Wittr., Nordst. and Lagerh. Alg. Ex. No. 1218. Dioecious, macrandrous; oogonium 1 (rarely 2), oblong-ellipsoid, pore superior; oospore ellipsoid, not nearly filling oogonium longi- tudinally, spore wall of three layers: outer and middle layers with 27-35 continuous, rarely anastomosate, longitudinal ribs; antheridium 1-8, scattered, often in upper part of filament; sperms 2, division vertical; vegetative cell, female 14-23 X 45-135, male 13-18 X 52-108; oogonium 39-51 75—-110u; oospore 36-43 X 56—70y; antheridium 13-14 X 6-16y. United States: Connecticut, Massachusetts, Iowa, Cali- fornia, Illinois, Ohio, Mississippi; Austria, England, Finland, France, Germany, Switzerland, Norway, Latvia, Sweden; Brazil; Greenland; British Columbia. 55a. Form dispar Hirn. (Pl. XXVI, fig. 230.) 1900, p. 124, Pl. XIV, fig. 76; P. B. A. No. 1226. Oospore smaller, ellipsoid-globose or subglobose; vegetative cell 14-21 X 60-170u; oogonium 38-45 X 70-92u; oospore 34-43 & 44-55n. United States: Massachusetts, Pennsylvania, California. CO bo THE OEDOGONIACEAE 55b. Var. notabile Lemmermann. (Pl. XXVI, fig. 229.) 1898, p. 511, Pl. 5, figs. 21-23; Hirn 1900, p. 125, Pl. XIV, fig. 78. Oogonium suboblong-obovoid; oospore obovoid or.ellipsoid-obovoid; vegetative cell 15-20X60-150u; oogonium 45-50X90-105u; oospore 4449 X 75-85y. Germany. 55c. Var. occidentale Hirn. (Pl. XXVI, figs. 227 and 228.) 1900, p. 125, Pl. XIV, fig. 77, P. B. A. No. 1671. Smaller; vegetative cell 8-15 X50-165n; oogonium 33-388 X 75-100; oospore 32-37 X45-50u; antheridium 12-13 X 10-16u..- United States: Maine. To be compared with Oe. paludosum (No. 53) and Oe. letopleurum (No. 54). 56. Oc. margaritiferum Nordstedt and Hirn. (Pl. XXVIH, fig. 234.) In Hirn 1900, p. 128, Pl. XV, fig. 83. Dioecious, macrandrous; oogonium 1, suboblong-ellipsoid or sub- obovoid-ellipsoid or subellipsoid, pore superior; oospore ellipsoid or globose-ellipsoid, usually not filling oogonium longitudinally (rarely quite filling it), spore wall of three layers: outer and middle layer with 30-35 granulate, anastomosate, longitudinal ribs, inner layer smooth; antheridium to 10-seriate; sperms 2, division vertical; female vegetative cell 23-28 X82-190u, male 17-23 X70—160y; oogonium 50-63 X 82-100y; oospore 48-61 X 55-75; antheridium 18—20X7-138z. Brazil. The granulate ribs of the oospore are distinctive. Compare with Oe. kjellmanti (No. 51). 57. Oe. crenulatocostatum Wittrock. (Pl. XXVIII, figs. 240 and 241.) Ss . 84; Collins 1909, p. 239; Heering 1914, p. 198, fig. 280; Tiffany 1926, p. 94, Pl. V, s. 48-50. Dioecious, macrandrous; oogonium 1-6, obovoid to subellipsoid, often terminal, pore superior; oospore of the same form as the oogonium, which it nearly or quite fills, outer spore wall smooth, median wall with 14-20 longitudinal ribs, crenulate and sometimes anastomosing, inner wall smooth; antheridium 2-6, often alternating with vegetative cell; sperms 2, division horizontal; terminal cell obtuse to broadly apiculate; female vegetative cell 10-18 X25=125u, male 9-13 X32-80y; oogonium 30-36 X 40-65; oospores 28-34 X 37—55y; antheridium 9-12 x 9—l4u. United States: Pennsylvania, Iowa, New York, Massa- chusetts, Ohio, Illinois, Connecticut, New Hampshire, Michigan. = OEDOGONIUM 93 57a. Form cylindricum Hirn. (Pl. XXVIII, fig. 244.) 1900, p. 129, Pl. XV, fig. 85; Oe. boscu (Le Cl.) Wittr. in P. B. A. No. 118, 1895. Oogonium and oospore cylindric-oblong or more rarely ellipsoid or obovoid-ellipsoid; ribs of vospore scarcely crenulate; vegetative cell 11-16 X44-150y; oogonium 30-36 X42-81lyu; oospore 27-34 K 4065p. United States: Massachusetts, Connecticut, Missouri, Illi- nois, New Hampshire. 57b. Var. aureum Tilden. (Pl. XXVIII, fig. 245.) In Amer. Algae, Nos. 123 and 186, 1896; 1898, p. 90, PI. 8, figs. 1-3; Hirn 1900, Pl. XV, p. 130, fig. 87. Oospore obovoid to globose-ellipsoid, not completely filling oogonium, middle spore wall with dentate ribs (sometimes nearly areolate); vegetative cell 10—-13X35-110y; oogonium 30-35X38-50u; oospore 29-33 X 35-43yu; antheridium 10 10x. United States: Colorado. 57c. Var. longiarticulatum Hansgirg. (Pl. XXVIII, figs. 242 and 243.) 1888, p. 46; Oe. calosporum Hirn 1895, p. 20, Pl. 1, fig. 3; Hirn 1900, p. 130, Pl. XV, fig. 86. Oogonium single; oospore obovoid to nearly ellipsoid, not filling oogonium, ribs of median layer of spore wall distinctly crenate; veg- etative cell 12-15 60—-90y; oogonium 27-30 58—0u; oospore 24-27 X 44-52y. United States: Michigan, Massachusetts; Austria, Finland; Brazil. There exists considerable variation in the members of the crenulatocostatum group. ‘The crenate or crenulate ribs (some- times nearly smooth), the usually seriate oogonia, and small size are characteristic. Cf. Oe. exocostatum (No. 50). The variety aureum has dentate ribs which sometimes appear nearly areolate. It is felt, after examining hundreds of specimens of this group, that the above form and varieties are usually sufficiently distinct to be recognized. Ecological variants are common and to give varietal distinction to each of these is merely to make a difficult situation worse. Plants of longzarit- culatum from Brazil are slightly smaller in all dimensions than those given above (Borge). Q4 cH. (On ©.GON EAC BAw 58. Oe. arcyosporum Nordstedt and Hirn. (Pl. XXVIII, fig. 247.) In Hirn 1900, p. 104, Pl. VII, fig. 44. Monoecious; oogonium 1-5, obovoid to ellipsoid-globose, pore superior; oospore ellipsoid-globose to subglobose, not usually filling oogonium, spore wall of three layers: outer smooth, median areolate, inner smooth; antheridium 1-4, subepigynous to subhypogynous; vegetative cell 138-2050-200u; oogonium 41—-55x43-68u; oospore 38-50 X 40-55u; antheridium 11-15 X8-12uy. Brazil. The only monoecious form with an areolate oospore wall. 59. Oe. areolatum Lagerheim. (Pl. XXVIII, figs. 248-250.) 1890, p. 80 and 89; Hirn 1900, p. 105, Pl. VII, fig. 45; Tiffany 1926, p. 91. Dioecious, macrandrous; oogonium 1-4, obovoid or obovoid-globose, with superior pore; oospore subellipsoid or ellipsoid-globose, filling or not filling oogonium, middle layer of spore wall areolate; antheridium 3-12, sperms 2; basal cell elongate; terminal cell apically obtuse; female vegetative cell 16-21X65-165u, male 15-19X60-140u; oogonium 48-60 X 60-75; oospore 45-57 X 48-60yu; antheridium 14-17 X8-10u. United States: Iowa, Ohio; Ecuador, Brazil. ae This species is to be compared with Oe. hoehnez (No. 202). It is one of the few dioecious macrandrous forms with areolate oospores. 60. Oc. dictyosporum Wittrock. (Pl. XXVIII, fig. 246.) 1874, p. 13; Hirn 1900, p. 103, Pl. VII, fig. 43; Tiffany 1926, p. 99. Monoecious; oogonium 1-2, obovoid-globose, with superior pore;> oospore globose to ellipsoid-globose, usually not filling oogonium, outer layer of spore wall reticulate, inner smooth; antheridium 1-8, sub- epigynous; sperms 2; vegetative cell 11-16 25—-95yu; oogonium 33-40 38-46u; oospore 28-38 x 30—-40u; antheridium 8-13 X5-10n. United States: Iowa; Brazil; Africa. 60a. Form westii Tiffany. 1929, p. 74; Oe. dictyosporum Wittr. forma West 1907, p. 98. Oogonium and oospore ovoid-ellipsoid; a little larger; vegetative cell 14-16 X50-80u; oogonium 42% 52u; oospore 40 50u; antheridium 13 X8—9un. Africa. The only monoecious representatives of the genus with reticulate oospores are Oe. dictyosporum and its f. westiz. The latter is a little larger than the type and is better recognized as a form until we have more data on its distinctive character- istics. OEDOGONIUM 05 61. Oc. foveolatum Wittrock. (Pl. XXIX, fig. 252.) 1878, p. 1383; Hirn 1900, p. 106, Pl. VII, fig. 46. Monoecious; oogonium 1-2, obovoid to subellipsoid-globose, with superior pore; oospore globose to subellipsoid-globose, filling or not filling oogonium, outer spore wall scrobiculate; antheridium 1-7; sperms two, division horizontal; basal cell elongate, terminal cell apically obtuse; vegetative cell 14-23X35-115yu; oogonium 37-49X38-57un; oospore 33-46 X 34-48u; antheridium 15-19 & 8-12u. Brazil: ot. Phomas island: The only monoecious representative of the genus with scrobiculate oospores. 62. Oe. scrobiculatum Wittrock. (Pl. XXIX, figs. 258 and 259.) as Wittr. and Nordst. Alg. Exs. No. 1018, 1898; Hirn 1900, p. 1838, Pl. XV, fig. 90. Dioecious, macrandrous; oogonium 1-3, obovoid or subellipsoid, pore superior; oospore of same form as oogonium and nearly filling it, outer spore wall scrobiculate, inner smooth; antheridium 1—?, sperms 2, division horizontal; female vegetative cell 16-2450-144u, male 15-19 X45-110u; suffultory cell 21-3034-90yu; oogonium 40-48 60-S88u; oospore 39-45 X48—57u; antheridium 13-15 8-12u. Ecuador. ° Cf. Oe. verrucosum (No. 63) ea Oe. tiffanit (No. 64). 63. Oc. verrucosum Hallas. (Pl. XXXI, figs. 272-274.) 1905, p. 408, fig. 17; Hirn 1906, p. 24, Pl. II, fig. 8. Dioecious, macrandrous; oogonium 1—2, broadly ellipsoid or obovoid- globose, pore superior; oospore globose or ellipsoid-globose, not filling oogonium, middle layer of spore wall scrobiculate; suffultory cell tumid; antheridium 4—?; sperms 2, division horizontal; basal cell elongate; terminal cell, frequently an oogonium, obtuse; vegetative cell, female 11-26 X45-200u; oogonium 56-68 56-944; oospore 52-64 44-68u; antheridium 16 X 16u; suffultory cell 19-49 x 30—145y; basal cell 30-35 x 45-160p. United States: Michigan; Denmark. Cf. Oe. scrobiculatum above and Oe. tiffanit below. The antheridial filaments of Oe. verrucosum are very short, usually consisting only of a holdfast cell and a few antheridial cells. 64. Oe. tiffanii Ackley. (Pl. XXX, figs. 261-263.) 1929, p. 304, Pl. XXXVI, figs. 15 and 16. Dioecious, macrandrous; oogonium 1-2, subdepressed-globose or broadly pyriform-globose, pore superior; oospore globose, nearly filling 3° 4, Lad “~, ae As J», 96 THE OED OGONT AG Eve oogonium, median layer of spore wall scrobiculate; suffultory cell enlarged; antheridium 1-7, division horizontal, sperms 2; basal cell ellipsoid-elongate; vegetative cell 21-22100—-240u; suffultory cell 25-32 X 100-2304; oogonium 64-76X65-69u; oospore 54-65 55-66yu; antheridium 19-21 X 14—20u. United States: Michigan (Muskegon Lake). Oe. tiffanii is to be compared with Oe. scrobiculatum (No. 62) and Oe. verrucosum above. These three normally have smaller suffultory cells and are thus separated from Nos. 65-69. 65. Oe. punctatum Wittrock. (Pl. XXIX, figs. 255 and 256.) 1878, p. 142; De Toni 1889, p. 84; Hirn 1900, p. 132, Pl. XV, fig. 89. Dioecious, macrandrous; oogonium 1-4, obovoid (rarely globose- obovoid), pore superior; oospore obovoid, nearly filling oogonium (rarely subglobose and not filling oogonium), outer spore wall scrobicu- late; antheridium 1—5, often alternating with vegetative cell; sperms 2, division horizontal; basal cell elongate terminal cell (often .ocogonium) apically obtuse; vegetative cell 15-2242-128u; oogonitum 38-45 x 52-65u; oospore 37-43 X 43-55y; antheridium 15-17 X6-10u. Mexico. Oe. punctatum, Oe. argenteum (No. 66), Oe. wyliez (No. 67), and Oe. americanum (No. 68) should be compared in identify- ing forms with scrobiculate oospores and non-tumid suffultory cells. They are easily separable on the basis of size. 66. Oc. argenteum Hirn. (Pl. XXIX, figs. 253 and 254.) Hirn 1900, p. 289, Pl. VII, fig. 47; Ackley 1929, p. 302. Dioecious, macrandrous; oogonium 1, obovoid-globose to globose, pore superior (rarely supramedian); oospore ovoid to globose, outer - layer of spore wall scrobiculate; antheridia 3-4, sperms 2, division horizontal; basal cell elongate; female vegetative cell (14—) 20-28 80-160u, male 20-2270-160u; oogonium 44-52X48-62u; oospore 43-48 x 44—50u; antheridium 22 8u. United States: Michigan; Brazil. The figure of Oe. argenteum in Pl. XXIX 1s that of Hirn and represents also one of the variations occurring in the Michigan material. The outer oospore wall of the alga seen by Hirn (1900) is undoubtedly scrobiculate. _Ornamentations on ocspore walls are quite regularly constant for a given species, appearing definitely on one layer or another. The Michigan specimens (Ackley 1929) contained oospores whose middle wall layer was scrobiculate with an apparently smooth and very thin outer layer. It is perhaps best to include, for the present at least, OEDOGONIUM 97 only those specimens that conform to the above description. If it develops that these forms with a middle scrobiculate wall may also have the outer wall scrobiculate, the description will have to be emended accordingly. The former had best be considered a form: 66a. Form michiganese Tiffany nov. f. Oe. argenteum Hirn (in part) in Ackley 1929, p. 302, Pl. XX XV, fig. 3-6. Middle wall of oospore scrobiculate; pore of oogonium supramedian; otherwise as in the type. United States: Michigan. 67. Oc. wyliei Tiffany. (Pl. XXX, figs. 264-267.) 1926, p. 90, Pl. I, figs. 1-4. Dioecious, macrandrous; oogonium 1-4, globose to ovoid, pore superior; oospore globose to ovoid, filling or not filling oogonium, outer spore wall irregularly scrobiculate; antheridium 1-4; sperms 2, division horizontal; basal cell elongate; terminal cell, often an oogonium, apically obtuse or broadly apiculate; vegetative cell 16-2480-170u; oogonium 52-64 68-112u; oospore 48-60 X 52-64; antheridium 16-19 xX 8-18. United States: Iowa, Michigan. See Oe. punctatum (No. 65). 68. Oe. americanum Transeau. (Pl. XXXI, figs. 275 and 276.) 1917, p. 231. Dioecious, macrandrous; oogonium 1, globose to depressed-globose, pore superior; oospore globose, ellipsoid. globose, or depressed- slobose, filling oogonium or not, spore wall of three | layers: median layer scrobicu- late; antheridium. 1-5, frequently alternating with vegetative cell; sperms 2, division horizontal: basal cell elongate; terminal cell obtuse: female vegetative cell 28-48 x 40- 100u, male vegetative cell 24— 30% 40-100y; oogonium 40-76 X 48-70; oospore 38— 74X46- —o6u; antheridium 20-28 X4-12y. United States: Michigan, Illinois. See Oe. punctatum (No. 65). 69. Oc. taphrosporum Nordstedt and Hirn. (Pl. XXXI, figs. 270 and 271.) In Hirn 1900, p. 133, Pl. XVI, fig. 91; Collins 1909, p. 239; P. B. A. No. 813. Dioecious, macrandrous; oogonium 1-6, obovoid or obovoid- ellipsoid, pore superior; oospore globose or ellipsoid globose, not filling oogonium, outer layer of spore wall scrobiculate, inner layer smooth; antheridium -2-?; terminal cell, sometimes an oogonium, obtuse; basal cell elongate; 98 THe Of pOGONnas On Awe vegetative cell 25-38 xX 100-375u; oogonium 70-83 X81-113yu; oospore 58-65 X 62-70u; antheridium 24-32 < 8-12u. United States: Massachusetts, Michigan, Illinois; Brazil; India; Columbia. This species is readily recognized by its large size and its scrobiculate oospore, the latter not filling the oogonium. West (1914) recorded the alga from Columbia with vegetative cells 19-22u in diameter, and with oogonia and oospores slightly smaller than the dimensions given above. 70. Oe. pseudacrosporum Wittrock. (Pl. XXX, figs. 268 and 269.) In Hirn 1900, p. 193, Pl. XXXII, fig. 196. Monoecious; oogonium 1, ellipsoid, operculate, division supreme, lid very small and often deciduous; oospore ellipsoid, completely filling oogonium, spore wall coalescing with that of oogonium, longitudinally ribbed, ribs evidently crenulate; antheridium 1-4, hypogynous or sub- epigynous; sperms 2, division horizontal; basal cell elongate; terminal cell long, setiform; vegetative cell 9-1332-110u4; oogonium ‘(27-) 32-37 X (40—) 45-56u; antheridium 8-10 6-10uy. United States: Iowa, Florida; Sweden. Its monoecious habit, supreme operculum, and ribbed oospore are characteristic. It should be compared with the nannandrous Oe. acrosporum (No. 195). 71. Oe. paucocostatum Transeau. (Pl. XXXII, fig. 277.) 1914, p. 300, Pl. XXVIII, fig. 5; Collins 1918, p. 66; Tiffany 1926, Pl. V, figs. 55 and 56. 2 Dioecious, macrandrous; oogonium 1, ellipsoid, operculate, division superior; oospore ellipsoid, nearly filling the oogonium, outer wall smooth, median wall longitudinally ribbed, ribs 15-19 in number, inner wall smooth; antheridium 2-8, sperms 2, division horizontal; terminal cell obtuse, basal cell usually elongate; vegetative cell, female (15—) 19-25 70-1604; oogonium 54-60 X 70-104u; oospore 50-56 X 66—-90u; anther- idium 18-23 x 8-12u. United States: Illinois, Iowa, Ohio. 7la. Var. gracilis Tiffany. (Pl. XXXI, fig. 278.) 1921, p. 273; 1926, p. 99. Somewhat smaller than the species, oospore ellipsoid or occasionally globose-ellipsoid, completely filling the oogonium or not filling the oogonium; otherwise similar to the type; vegetative cell 15-20 x 66-120; oogonium 48-52 x 70-88; oospore 44-48 X 60-704; antheridium 17-20 X 8-12u. United States: Ohio, Iowa. OEDOGONIUM 99 Oe. paucocostatum is characterized among the species with ellipsoid oogonia and longitudinally ribbed oospores by the ~ small number of ribs and by its relatively smaller dimensions. Its nearest relative is the larger Oe. australianum (No. 72). 72. Oe. australianum Hirn. (Pl. XXXII, figs. 283 and 284.) 1900, p. 192, Pl. XX XI, fig. 192. Dioecious, macrandrous; oogonium 1-2, ellipsoid, operculate, division superior; oospore ellipsoid or globose-ellipsoid, practically filling oogonium, median layer of spore wall longitudinally ribbed, ribs 17-23, sometimes anastomosing; antheridium to 6-seriate; vegetative cell 17-22 X 70-170; oogonium 59-74 X 74—96u; oospore 56-70 X 59-74y; antheridium 14-16 10-15u. Australia. Cf. Oe. paucocostatum, above. 73. Oc. tumidulum (Kuetzing) Wittrock. (Pl. XXXII, figs. 281 and 282.) 1874, p. 35; Conferva tumidula English Botany No. 1670 in Kuetz. Dec. Alg. No. 60, 1833: Hirn 1900, p. 191, Pl. XX XI, fig. 191. Dioecious, macrandrous; oogonium 1, subellipsoid, operculate, division superior; oospore ellipsoid or globose-ellipsoid, quite filling oogonium, outer layer of spore wall with 40—50 longitudinal ribs granu- late and sometimes anastomosate, inner layer smooth; antheridiurn to 45-seriate; sperms 2, division horizontal; vegetative cell, female 18-25 65-125u, male 15-20X60-120u; oogonium 52-63X78-90u; oospore 49-58 X61—75u; antheridium 15-20 9-15un. Germany. Oe. tumidulum is the only dioecious, macrandrous member of the genus having the combination of subellipsoid oogonia with superior pore and more than 40 longitudinal ribs on the oospore. Cf. the monoecious Oe. insigne (No. 75). 74. Oc. nobile Wittrock. (Pl. XXXII, fig. 279.) 1874, p. 14; Hirn 1900, p. 189, Pl. XXX, fig. 188. Monoecious; oogonium 1 (very rarely 2); ellipsoid or subobovoid- ellipsoid, operculate,. division superior; oospore ellipsoid-globose or globose, not filling oogonium, spore wall of three layers: outer layer ‘smooth, middle layer with 30-35 continuous longitudinal ribs, rarely anastomosate, inner layer smooth; antheridium 1-3, hypogynous; sperms 2, division horizontal; vegetative cell 16-20 x 80—180u; oogonium 57-65 X 67-90u; oospore 48-55 50—-58u; antheridium 15-19X9-13uy. Norway. 100 THe O28 DOGON ACE AE 74a. Var. minus Hirn. (Pl. XXXII, fig. 280.) 1900, p. 190, Pl. XXX, fig. 189; Oe. insignis Hirn var. minus Hirn 1895, p. 15. Larger oospore, ellipsoid, filling oogonium; vegetative cell 13-20 80-240u; oogonium 60-63 85-1004; oospore 56-59X68-80u; anth- eridium 16-19 X12-17p. United States: Massachusetts; Finland. Oe. nobile ts near the larger Oe. insigne (No. 75) and differs from Oe. tumidulum (No. 73) in being monoecious. The variety minus sometimes has smaller vegetative cells and always a larger oospore than the type. 75. Oe. insigne Hirn. (Pl. XXXIII, fig. 285.) 1895, p. 14, Pl. 1, fig. 2; 1900, p. 191, Pl. XXX and XXXI, fig. 190. Monoecious; oogonium 1, ellipsoid-obovoid, operculate, division superior; oospore ellipsoid, quite filling oogonium, spore wall of three layers: outer smooth, inner longitudinally ribbed, the ribs quite entire, anastomosate, 40-45 in number, inner smooth; antheridium 1-7, subepigynous, rarely scattered; sperms 2, division horizontal; vegetative cell (18—) 25-88 X 75-210u; oogonium 70-78 X 100—120u; oospore 65-75 X88-104y; antheridium 23-27 X 15-23y. Finland. Cf. Oe. tumidulum (No. 73) and Oe. nobile (No. 74). 76. Oe. excisum Wittrock and Lundell. (Pl. XXXIV, fig. 317.) In Wittr. 1872; p. 3, Pl. 1, figs. 1-4; Hirn 1900, p. 153, Pl. XXIV, fig. 126. Monoecious; oogonium 1, subconically oblong, medianly plicate with about 9 longitudinal undulations, operculate, division median and broad; oospore ellipsoid with a median constriction, not filling oogonium, spore wall smooth; antheridium 1-2, subepigynous or hypogynous, often terminal; sperm (?) 1; basal cell subhemispherical; terminal cell apically obtuse; vegetative cell 83-6 X 14-44y; oogonium 13-15 X 18-26; oospore 9-12 15-18u; antheridium 3-4 6-7; basal cell 8-9 4—5y. Finland, Sweden, Latvia. Oe. excisum is one of the very few species of the genus having an oospore with a median constriction. It is near Oe. pusillum (No. 221), from which it differs in having undulate folds in the oogonium. 77. Oe. inversum Wittrock. (Pl. XXXIII, figs. 295-297. ) 1876, p. 47, Pl. 13, figs. 22-24; (?) Oe. monticchu Fiorini-Mazzanti 1860, p. 259, Pl. 1, figs. 3, 4, 4a, 4b; Hirn 1900, p. 179, Pl. XXVIII, fig. 171; Oe. tnversum Wittr. var. subclusum Wittr. in Wittr. and Nordst. Alg. Exs. No. 26, 1877; Oe. inversum Wittr. f. subclusum (Wittr.) Hirn 1900, p. 180, Pl. XXVIII, fig. 172; Heering 1914, p. 208, fig. 290; Tiffany 1926, p. 95, Pl. VI, figs. 59-62. OEDOGONIUM 101 Dioecious, macrandrous; oogonium 1, globose, operculate, division . inferior; oospore globose, quite filling the oogonium, spore wall smooth; antheridium 1-8; sperm-1; vegetative cell capitellate; basal cell sub- hemispherical, not elongate; filament not infrequently incrusted with lime; female vegetative cell 12-14X25-100u, male 9—-11X20-80y; oogonium (28-) 32-35X30-34u; oospores (27—-) 30-382X27-30u; antheridium 10-12 9-12u; basal cell 13-20 7-14u. United States: Iowa; Australia; Austria, France, Germany, Sweden, Switzerland; Africa. Easily distinguished among the macrandrous species by the inferior position of the operculum. It is in some respects similar to Oe. infimum below. The f. subclusum, according to the Iowa material (Tiffany 1926), is merely an ecological variant and is not tenable. The variations of the species proper include the form. 78. Oc. infimum Tiffany. (Pl. XXXIII, figs. 289-292.) 1924, p. 183, Pl. II, figs. 6-9; 1926, p. 95, Pl. VI, figs. 59-62. Dioecious, macrandrous; oogonium 1, globose or subglobose (or the basal part extended, appearing subpyriform-globose), operculate, division at the lowest extremity of the oogonium; oospores globose or subglobose, membrane smooth; male plants a little larger than the female; antheridium 1-10; sperms 2; vegetative cells distinctly capitel- late; basal cell of filament subhemispherical, not elongated; filaments not infrequently incrusted with lime; female vegetative cells 12-18 60-140u, male 16—-2060-140u; oogonium 40-48X41-50u; oospore 40-44 X 38-42u; antheridium 14-208-12u; basal cell 30-42 16-24. United States: Iowa. Oe. infimum is the only known member of the genus with the operculum located at the lowest extremity of the oogonium. It is further characterized by its evidently capitellate vegetative cells. 79. Oe. howardii West. (Pl. XXXIII, fig. 293.) 1904a, p. 281, Pl. 464, figs. 1-5; Hirn 1906, p. 16, Pl. III, fig. 9. Dioecious, macrandrous; oogonium 1-2, globose (or subglobose), operculate, division median, distinct; oospore globose (or subdepressed- globose) filling oogonium; antheridium to 16-seriate, sperm (?) 1; vege- tative cell broadly capitellate; basal cell subhemispherical, scarcely elongate; vegetative cell, female 9-1220-44u; male 7-9X16-35y; oogonium 29-33 X29-33u; oospore 25-29 X25-29u; antheridium 7-9 X 8—14u; basal cell 14-16 10-11. West Indies: Barbados. 102 THE OF DOCON TNE BOE 79a. Var. minus Tiffany. (Pl. XXXIII, fig. 294.) 1927, p. 204, Pl. IX, figs. 6 and 7 (as v. minor). Smaller than the type; vegetative cell 7-9 x 27-48yu; oogonium 26-29 X28-36u; oospore 24—-26X24—-26u; antheridium 7-8X10—-12u; basal cell 12-14 X 10-12. United States: Illinois. Oe. howardi has broadly capitellate vegetative cells as in Oe. infimum (No. 78) and Oe. inversum (No. 77), but differs from both in the median position of its operculum. It is perhaps nearest Oe. latiusculum (No. 81), the latter being larger and possessing a very wide division of the oogonium. The variety minus is characterized chiefly by its smaller size and subspherical basal cell. 80. Oe. pratense Transeau. (Pl. XXXIV, figs. 298 and 299.) 1914, p. 297, Pl. XXIX, figs. 9-12; Collins 1918, p. 66; Tiffany 1926, p. 96, Pivstisss l0vand tal: Dioecious, macrandrous; oogonium 1 (rarely 2), subdepressed- globose or broadly pyriform-globose, operculate, division median, narrow but distinct; oospore depressed-globose or subglobose, filling or nearly filling oogonium, spore wall smooth; antheridium 1-2, usually alternating with vegetative cell; sperm 1; basal cell elongate; vegetative cell, female 10—-17X35—-95y, male 8-15X32-82u; oogonium 33-40 35-50; oospore 32-88 X 28-35u; antheridium 10-14 13-18u. United States: Illinois, Iowa, Ohio, Alabama, Mississippi, Michigan. Oe. pratense is distinguished from Oe. latiusculum below by the narrow opening of the operculum and by its cylindrical vegetative cells. The latter character together with its larger size separates it from Oe. howardit (No. 79). The basal cell of Oe. pratense is uniformly elongate. Among the monoecious forms it bears some resemblance to Oe. acmandrium (No. 82) and Oe. psaegmatosporum (No. 83). Sl. Oe. latiusculum Tiffany. (Pl. XXXIII, figs. 287 and 288.) 1924, p. 182, Pl. III, figs. 4-6; 1926, p. 96, Pl. VI, figs. 72-74. Dioecious, macrandrous; oogonium 1-2, globose to ellipsoid-globose; oogonium operculate, division median, very wide; oospore of the same form as the oogonium which it very nearly or completely fills, wall smooth; male plant somewhat larger than the female; antheridium 1, usually alternating with a single vegetative cell, sperm 1; vegetative cell distinctly capitellate; basal cell of filament subhemispherical, not elongated; filament not infrequently incrusted with lime; female veg- OEDOGONIUM 103 etative cell 10-18X16—-40u, male 14-20*16—-40u; oogonium 382-36 32—40u; oospore 28-32 X 28-34; antheridium 14-18 X 12—20u; basal cell 16-24 X 12-16. United States: Iowa, Mississippi, Alabama, Kentucky. The wide operculum, the capitellate vegetative cells, the single antheridium alternating with a vegetative cell, and the subhemispherical basal cell are characteristic of the species. 82. Oe. acmandrium Elfving. (Pl. XXXIV, fig. 300.) In Hirn 1895, p. 13; Hirn 1900, p. 150, Pl. XXIII, fig. 120. Monoecious; oogonium 1-2, depressed-globose or subglobose, operculate, division median and narrow; oospore depressed-globose or subglobose, filling oogonium, wall smooth; antheridium 1-3, sub- epigynous, ‘epigynous, or hypogynous, often terminal; sperm single; basal cell elongate; vegetative cell 7-10X30-80u; oogonium 30-35 x 28-38; oospore 28-33 & 25-29; antheridium 8-10 10-15y. United States: Illinois; Finland, Sweden; India. Cf. Oe. pratense (No. 80) and Oe. psaegmatosporum below. 83. Oc. psaegmatosporum Nordstedt. (Pl. XXXIV, fig. 301.) 1877, p. 24, Pl. 3, fig. 1-3; Hirn 1900, p. 150, Pl. XXIII, fig. 121. Monoccious; oogonium 1-5, broadly pyriform-globose, operculate, division median, narrow but distinct; oospore depressed-globose to globose, inflating the middle part of oogonium, spore wall (?) smooth; antheridium to 15-seriate, hypogynous, cell a little tumid; sperm single; vegetative cell 9-10X56-80u; oogonitum 28-33X33-40u; oospore 27-31 X 24-27; antheridium 9-12 6-10up. - Denmark, Sweden. ; Near Oe. acmandrium above, differing in its . pyriform- globose and medianly inflated oogonia and many-seriate antheridia. ; 84. Oe. minus Wittrock. (Pl. XXXIV, fig. 302.) 1874, p. 9; Oe. punctato-striatum var. minor Wittr. 1870, p. 123; Oe. spirogranu- latum Schmidle 1894, p. 43, Pl. 7, fig. 1; Hirn 1900, p. 151, Pl. XXIII, fig. 122. Monoecious; oogonium 1, pyriform-globose or depressed-globose, operculate, division median, wide; oospore depressed-globose, not filling oogonium, spore wall smooth; antheridium to 10-seriate, subepigynous or subhypognous or rarely scattered, cells a little tumid; sperm 1; vegetative cell somewhat capitellate; wall of vegetative cell and of oogonium spirally punctate; basal cell depressed-globose or sub- hemispherical, wall vertically plicate; vegetative cell 9-13 30-78u; oogonium 34-46 xk 28—42u; oospore 30-42 < 26-36u; antheridium 9-13 x 3—Om. 104 THE OEDOGONTIACEAE United States: Massachusetts, Michigan; Finland, Ger- many, Spain, Norway, Sweden, Latvia, Russia. Oe. minus is one of the few species of the genus with spirally punctate vegetative cell and oogonial walls. It is easily separable from the nannandrous elegans (No. 155) and the macrandrous punctatostriatum (No. 85) not only by its mono- ecious habit but also by its size. 85. Oe. punctatostriatum De Bary. (Pl. XXXIV, figs. 303 and 304.) 1854, p. 47, Pl. 2, figs. 15 and 16; Hirn 1900, p. 152, Pl. XXIII, fig. 128. Dioecious, macrandrous; oogonium 1, depressed-globose, operculate, division median, rather wide and distinct; oospore depressed globose, not filling oogonium, spore wall smooth; antheridium to 10-seriate; sperm 1; wall of vegetative cell and oogonium spirally punctate; basal cell depressed-globose or subhemispherical, wall vertically plicate; female vegetative cell 18-22 38-128y, male 16-19 X 33-108; oogonium 48-55 X38-48u; oospore 40-51 *35—-42u; antheridium 16-19 X6—12y; basal cell 28-31 x 21-25. United States: Iowa, Illinois, Florida, Michigan; England, Finland, France, Ireland, Germany, Norway, Russia, Latvia, Sweden; Brazil; Greenland; Australia; British Columbia. Cf. Oe. minus above. 86. Oe. capitellatum Wittrock. (Pl. XXXIV, fig. 315.) 1874, p. 7; oe eka Wittr. 1870, p. 122, and 1872, p. 23; Hirn 1900, p. 149, Pl. XXIIL, fiz. 1 ee. oogonium 1, subdepressed or depressed globose, operculate, division median, narrow but distinct; oospore depressed globose, completing (or nearly so) oogonium, spore wall smooth; antheridium 1-2, subepigynous or hypogynous or rarely scattered: sperm (?) 1; vegetative cell capitellate; basal cell subhemispherical : terminal cell piliform: vegetative cell 6-9 X20-60yu; oogonium 20-25 x 17-234; oospore 18-23X15-19u4; antheridium 6-7X8-9yu; basal cell 16-18 X6-8y. United States: Ohio, Illinois, Mississippi, Alabama; British Columbia; Denmark, Finland, Sweden; Turkestan; Caucasus; Burma. Among the species with capitellate vegetative cells it is characterized by its monoecious habit and small size. It differs from Oe. quadratum below in the absence of angular- globose oogonia. OEDOGONIUM 105 87. Oe. quadratum Hallas. (Pl. XXXIV, figs. 306-308. ) 1905, p. 405, fig. 12; Hirn 1906, p. 19, Pl. III, fig. 10. Monoecious; oogonium 1-4, angular-globose, operculate, division median; oospore angular-globose, filling oogonium, spore wall smooth; antheridium 1, alternating with vegetative cell; vegetative cell capitel- late; basal cell subhemispherical; vegetative cell 5-12 25-140y; oogonium 22-28 X 28-33"; oospore 20-26X26u; antheridium 10-12 12—14u; basal cell 7-12 X 6-9un. Denmark. - Cf. Oe. capitellatum above. 88. Oe. bohemicum Hirn. (Pl. XXXVI, fig. 344.) 1900, p. 169, Pl. XXVII, fig. 154; Heering 1914, p. 216, fig. 327; Tiffany 1926, pelOle Plz PTI. fig. 30. Monoecious; oogonium 1, globose, operculate, division superior; oospore globose, filling oogonium, spore walls smooth; antheridium 1-4, subepigynous; sperms 2, division horizontal; vegetative cell cap- itellate, 10-16X21-66u; oogonium 42-4546-49u; oospore 40-43 x 40-43; antheridium 9-10 5-7. United States: Iowa; Austria. This is the largest of the monoecious species combining the median location of the operculum and the capitellate vegetative cell. The dimensions above, from the Iowan material, also include those of the Austrian specimens. 89. Oe. mitratum Hirn. (Pl. XXXVI, figs. 334 and 335.) 1895, p: 22, Pl. 1, fig. 7; 1900; p. 302, Pl. XXIV, fie. 132. Dioecious, macrandrous; oogonium 1-4, globose or subglobose, operculate, division supramedian or superior, narrow but distinct; oospore globose (rarely subglobose), filling oogonium, spore wall smooth; antheridium 1—5, subepigynous, sperms 2, division horizontal; vegetative cell often broadly capitellate; vegetative cell 5-10 18-80u; oogonium 18—24 X 20—-28u; oospore 17—23 X 17—22u; antheridium 6-9 X6-8uy. United States: Illinois; Austria, Finland, Sweden. Hirn (1900) records this species as doubtfully monoecious, but material from Illinois (Transeau) shows it to be definitely dioecious, macrandrous. The emended description was sup- plied from the Illinois material. Cf. Oe. petri below. 90. Oc. petri Wittrock. (Pl. XXXVI, fig. 332.) 1874, p. 6; Hirn 1900, p. 154, Pl. XXIV, fig. 127. Monoecious; oogonium 1 (rarely 2), pyriform or pyriform-globose, operculate, division a little above median; oospore subdepressed or 106 THE -O EBD OGOMIACEAE depressed-globose, filling oogonium, spore wall smooth; antheridium 1-2, hypogynous or epigynous or subepigynous; sperm 1; basal cell elongate; terminal cell apically obtuse; vegetative cell 6-7 32—48u; oogonium 21-24 22-29y; oospore 20-23 X 16-19u; antheridium 5-7 X 9-11. Germany, Spain, Sweden; Ceylon. 91. Oe. trioicum Woronichin. 1923, p. 99. Dioecious macrandrous, or monoecious; oogonium 1-3, sometimes terminal, ellipsoid, operculate, division superior; oospore ellipsoid or subovoid, spore wall smooth, faintly violet; antheridium 1-6, hypogy- nous in monoecious filament, scattered or terminal in male filament; terminal cell obtusely rounded; basal cell attenuate; male plants 130-330 long; vegetative cell 4—5 x 12-22u; oogonium 25-27 x 138-16y; oospore 20-21 X 14y; antheridium 4X 3uy. Near Baku, in Azerbaijan (west coast of the Caspian). This plant according to Woronichin is both dioecious, macrandrous and monoecious, in this respect similar to Oe. varians (No. 10). It should be compared with the macrandrous pringsheimit (No. 95) and the monoecious gracillimum (No. 114). Unfortunately no figure is available. 92. Oc. welwitschii West and West. (PI. XXXVI, figs. 351 and 352.) 1897, p. 5; Hirn 1900, p. 174, Pl. XXVIII, fig. 162; Tiffany 1926, p. 97, Pl. IV, figs. 41 and 42. Dioecious, macrandrous; oogonium 1-38, subovoid-globose, opercu- late, division superior; oospore globose, filling or not filling oogonium, . spore wall smooth; antheridium 2; female vegetative cell 20-28 X 25-84, male 17-20 X 35-80y; oogonium 43-50 X 43-52y; oospore 35-43 X 35—-42y; antheridium 16-18 X 7—9u. United States: Iowa, Illinois, Alabama; Africa. This species is near Oe. iowense below, but differs in having at once both larger vegetative cells and smaller oogonia. It may be near the imperfectly known dioicum (No. 94) and is larger than Oe. pringsheimii (No. 95). 93. Oc. iowense Tiffany. (Pl. XXXVII, figs. 353-355. ) 1924, p. 181, Pl. III, figs. 1-3; 1926, p. 97, Pl. VI, figs. 69-71. Dioecious, macrandrous; oogonium 1-2, globose, or ellipsoid-globose, operculate, division superior; oospore of the same form as the oogonium, which it completely fills or not, spore wall smooth; antheridium 1-25, sperms 2, division horizontal; basal cell of filament commonly elongated; vegetative cell 10-16X44-100u; oogonium 52-60X60-80u; oospore 45-56 X 50-644; antheridium 10-12 10-20y; basal cell 16-24 60-80y. OEDOGONIUM 107 United States: Iowa, Ohio, Kentucky. This species is easily recognized by the considerable difference between the diameter of the vegetative cells and that of the relatively much larger oogonia. Its oogonia are larger than those of Oe. welwitschit above. 94. O6ce. dioicum Carter. (Pl. XXXVII, figs. 356 and 357.) 1858, p. 30, Pl. 3, figs. 1-2, 5-8, 18-16; Hirn 1900, p. 175, Pl. XXVIII, fig. 163. Dioecious, macrandrous; oogonium 1, obovoid-globose, operculate, division superior; oospore globose, not filling oogonium, spore wall smooth; male plants a little smaller than female; antheridium 10-20, sperms (?) 2, division vertical; female vegetative cell about 32 80—-110x, male about 28 70—-95u; oogonium about 82 92u. India. No data beyond those of Carter are available, and Oe. dioicum is retained here largely because it cannot be definitely discarded upon our present knowledge of the species. 95. Oe. pringsheimii Cramer; Wittrock. (Pl. XXXV, figs. 325 and 326.) Cramer 1859, p. 17, Pl. 1, fig. C 1-4; Wittr. 1870, p. 185; Wittr. 1874, p. 33, Pl. 1, figs. 16 and 17; Hirn 1900, p. 170, Pl. XX VII, fig. 155; Oe. pachydermatos porum Nordst. 1878, p. 21, Pl. 2, fig. 18-15; Oe. pringsheimi Cram.; Wittr. var. Nordstedtiu Wittr. f. pachydermatosporum (Nordst.) Hirn 1900, p. 173, Pl. X XVII, fig. 160; Collins 1909, p. 246; Heering 1914, p. 202, fig. 284; Tiffany 1926, p. 98, Pl. V, figs. 45 and 46. Dioecious, macrandrous; oogonium 1—6, subovoid-globose, opercu- late, division superior; oospore globose, nearly filling oogonium, spore wall smooth, often thickened; antheridium to 10-seriate, often alter- nating with vegetative cell; sperms 2, division horizontal; basal cell elongate, terminal cell broadly apiculate or obtuse; female vegetative cell 14-20 X 28-100u, male 12-16 24—-64y; oogonium 35-43 x 36—-46y; oospore 30-37 X 30-87; antheridium 10-15 6-9u. United States: Iowa, New York, Pennsylvania, Florida, Ohio, Utah; Africa, Afghanistan; Australia; Austria, Denmark, England, Finland, Italy, Norway, Latvia, Sweden, Switzerland. 95a. Var. abbreviatum Hirn. (Pl. XXXV, fig. 331.) 1900, p..173, Pl. XX VII, fig. 161. Smaller; vegetative cell broader; oogonium 1, obovoid-globose, nearly filled by oospore; vegetative cell 10-1315-39u; oogonium 28-32 X 30-35; oospore 27-30 X 27-30y. Brazil. 108 THE OEDOGONIACEAE 95b. Var. nordstedtii Wittrock, (Pl. XXXV, figs. 327-330. ) In Wittr. and Nordst. Alg. Exs. No. 8, 1877; Oe. ciliare De Notaris 1868, p. 120; Oe. franklinianum Wittr. in Tilden Amer. Alg. No. 2, 1894; Oe. nordstedtii Wittr. 1872, p. 6, Pl. 1, figs. 7 and 8; Oe. pringsheimii var. varians Nordst. 1888, p. 11, Pl. 1, fig. 9; Oe. pachydermatosporum Nordst. in Lewin 1888, p. 18, Pl. 3, fig. 56; Hirn 1900, p. 171, Pl. XXVII, figs. 156-158; Oe. pringsheimit Cram.; Wittr. var. nord- stedtur Wittr. f. euganeorum (Wittr.) Hirn 1900, p. 172, Pl. X XVII, fig. 159; Oe. euganeorum Wittr. 1874, p. 39; Tiffany 1926, p. 98, Pl. V, fig. 47. Smaller than the type, oogonium 1-2; oospore not filling oogonium; female vegetative cell 10-1620-76yu, male 9-15X18-68y; oogonium 28-39 X 36—45u; oospore 26-34 x 27-34u; antheridium 9-12 8-9u. United States: Minnesota, California, Iowa, Illinois, Ohio, Michigan; Austria, England, Finland, Latvia, Germany, Italy, Switzerland, Spain; India; Patagonia; Greenland; Samoa. Oe. pringsheimit is characterized by its subovoid-globose oogonia and superior position of the operculum, among the dioecious species. Its oogonia are smaller than either Oe. towense (No. 93) or Oe. welwitschit (No. 92). The variety abbreviatum has shorter vegetative cells and var. nordstedti is more slender than the type. 96. Oe. nodulosum Wittrock. (Pl. XXXIX, figs. 374 and 375.) 1872a, p. 22, Pl. 1, figs. 8-10; 1874, p. 13, Pl. 1, figs. 2 and 3; Borge 1899, p. 6, Pl. 1, fig. 3; Hirn 1900, p. 187, Pl. X XIX, fig. 184. Monoecious; oogonium 1-2, obovoid-globose or more rarely obovoid- ellipsoid, operculate, division superior; oospore globose or subglobose or more rarely globose-ellipsoid, nearly filling oogonium, spore wall smooth, often thick; antheridium 1-3, subepigynous or hypogynous; sperms 2, ~ division horizontal; basal cell elongate, not constricted; terminal cell obtuse or apiculate; vegetative cell, with two undulate constrictions, 20-29 < 30-140u; oogonium 48-57 X56-73u; oospore 46-53 49-56u; antheridium 18-25 7-9u. Australia; China; Patagonia; England, Sweden. 96a. Var. commune Hirn. (Pl. XXXIX, fig. 376.) 1900, p. 187, Pl. XXX, fig. 185; Oe. nodulosum Wittr. in P. B. A. No. 74, 1895, and im Hirn 1895, p. 138; Collins 1909, p. 248. Oogonium subobovoid-ellipsoid to ellipsoid or more rarely globose- ellipsoid; vegetative cell 22-2935-140u; oogonium 64-74 70-90y; oospore 56-70 X67-80u; antheridium 18-26 X7-10uy. United States: Massachusetts; Finland, Sweden. The nodulose character of the vegetative cells is very distinctive. Oc. sphaerandrium (No. 105) sometimes has nodu- lose cells, but it is much smaller. Var. commune has larger OEDOGONIUM 109 oogonia and oospores. Oe. undulatum (No. 119), anannandrous species, has vegetative cells four times undulate-constricted while Oe. nodulosum has two undulate constrictions. 97. Oe. porrectum Nordstedt and Hirn. (Pl. XXXVIII, figs. 361 and 362.) In Hirn 1900, p. 186, Pl. X XIX, fig. 183. Dioecious, macrandrous; oogonium 1, oblong, operculate, division superior; oospore ellipsoid or globose-ellipsoid, not filling oogonium longitudinally, spore wall smooth; antheridium to 4-seriate; sperms 2, division horizontal; female vegetative cell 7-1025-55y, male 6-9 25-62u; oogonium 24-27 X 44-53; oospore 23-24 X 25-28u; antheridium 6-7 X6-8u. Brazil. 98. Oe. nanum Wittrock; Tiffany. (Pl. XXXVI, figs. 342 and 343.) 7 poe 1874, p. 37; Hirn 1900, p. 305, Pl. X XIX, fig. 174; Tiffany 1926, Pl. VI, gs. —Do. Dioecious, macrandrous; oogonium 1-8, ovoid to broadly ellipsoid, operculate, division superior; oospore ovoid to globose-ellipsoid, usually filling the oogonium, spore wall smooth; antheridium 1-3, sperm 1; basal cell subhemispherical; terminal cell, often an oogonium, apically obtuse; vegetative cell, often irregularly swollen, 6-1015—-33u; oogonium 24-28 x 30-364; oospore 21-27 X 23-380y; antheridium 7—-10X 8-llyu; basal cell 14-17 X 12-16u. United States: Iowa; India. Originally found in India, this species was only completely described from the Iowan material. It bears some resemblance to Oe. pisanum below. It is found almost entirely epiphytic on submerged leaves, on Pithophora, on Cladophora, and on other species of Oedogonium. 99. Oe. pisanum Wittrock. (Pl. XXXVIII, figs. 363 and 364.) 1876, p. 50, Pl. 13, fig. 28; Oe. subpisanum Lewin 1888, p. 17, Pl. 3, figs. 49-52; ae 1900, p. 181, Pl. XXIX, fig. 175; Heering 1914, p. 203, fig. 291; Tiffany 1926, p. 97. Dioecious, macrandrous; oogonium 1 (rarely 2-3), ellipsoid-ovoid to ovoid, operculate, division superior; oospore ovoid to ellipsoid, nearly filling oogonium, spore wall smooth; antheridium 1-4; sperms 2, division horizontal; basal cell elongate; terminal cell piliferous; vegetative cell 5-12 12-72; oogonium 23-29 (-32) «34-43 (-45)u; oospore 21-25 X 27-37; antheridium 4-9 X 5-9u. United States: Iowa, Illinois, Ohio, Mississippi; Austria, Italy, Spain; Africa. 110 Lie © PDOGORerA CELE 99a. Var. gracilis Transeau and Tiffany. (Pl. XXXVIII, figs. 365 and 366.) 1919, p. 241; Tiffany 1926, p. 98, Pl. III, figs. 31-34. Oogonium and oospore ellipsoid to ellipsoid-ovoid; vegetative cell, female 6-9X18-48u, male 5-8X16-45yu; oogonium 16-20 20-30u; oospore 15-18 X 18-28u; antheridium 5-7 X5-10y. United States: Iowa, Illinois, Mississippi. The combination of small size, elongate basal cell, and piliferous terminal cell is sufficient to characterize the species. The presence of subhemispherical basal cells in Oe. nanum (No. 98) easily separates it from Oe. pisanum. The variety gracilis is smaller. Often epiphytic on other species of algae. 100. Oc. pyriforme Wittrock. (Pl. XXXVI, fig. 348.) 1874, p. 39; Hirn 1900, p. 303, Pl. XXV, fig. 137. Monoecious; oogonium 1, pyriform, operculate, division superior; oospore pyriform, filling or not filling oogonium, spore wall smooth; antheridium 1-3, subepigynous, epigynous, hypogynous, or scattered; sperms 2, division horizontal; vegetative cell 13-16 X48—90u; oogonium 40-46 X (44-)48-60u; oospore 36-4236-44y; antheridium 10-12 8-12u. Tasmania; British Columbia. The pyriform oogonium is characteristic. The dimensions of Oe. pyriforme separate it from Oe. simplex (No. 102) and Oe. pyrulum (No. 103). Originally found in Tasmania, the above complete description 1s furnished from material collected in British Columbia by Mr. G. H. Wailes. 101. Oe. gunnii Wittrock. (Pl. XXXIV, fig. 318.) 1874, p. 37; Hirn 1900, p. 298, Pl. XXIII, fig. 119. Monoecious; oogonium 1-4, subdepressed- or depressed-globose, operculate, division median, narrow but distinct; oospore same form as oogonium and filling it, spore wall smooth, outer layer thick and hyaline, inner brown; antheridium subepigynous; vegetative cell 6-9 X30-85y; oogonium 23-29 X 19-294; oospore 22-27 X 17—23u; antheridium 6 X 12u. United States: Alabama; Australia. Material collected in Alabama by Professor E. N. Transeau shows Oe. gunnii to be definitely monoecious. Its distinctly narrow median division of the oogonium separates it from the imperfectly known Oe. poecilosporum (No. 224). OEDOGONIUM aaa 102. Oe. simplex Hirn. (PI. XXXVI, fig. 340.) 1900, p. 158, Pl. XXIV, fig. 135. Monoecious; oogonium 1, obovoid-pyriform, operculate, division superior; oospore globose, ellipsoid or obovoid-globose, not filling oogonium, spore wall smooth; antheridium 1—?, subepigynous; sperms 2, division horizontal; vegetative cell 11-13X35-58y; oogonium 26-32 33-40u; oospore (22—) 24-80 23-30u; antheridium 8-10 7-10u. Brazil: Cf. Oe. pyriforme (No. 100). 103. Oc. pyrulum Wittrock. (Pl. XXXVI, fig. 349.) 1872, p. 2; Hirn 1900, p. 158, Pl. XXV, fig. 136. Monoecious; oogonium 1, globose-pyriform, operculate, division superior; oospore subdepressed-globose or subglobose, not filling oogonium, spore wall smooth; antheridium 1, epigynous or hypogynous or rarely subepigynous; basal cell elongate; terminal cell apically broadly acute; vegetative cell 8-11 30-75y; oogonium 30-33 X 31-385y; oospore 26-29 X 24—28y; antheridium 8-9 X 10—11p. Sweden; Ceylon. 108a. Var. amplius W. R. Taylor. (Pl. XXXVII, fig. 350.) 1928, p. 107, Pl. 18, figs. 1-4 (as v. amplior). Larger oogonium; vegetative cell 9-12 40-64; oogonium 34-40 30-44; oospore 26—28 X 26—-28y, not filling oogontum; antheridium sub- epigynous 10X6uz. British Columbia. Oe. pyrulum is separated from the species of the genus having pyriform or subpyriform oogonia largely by dimensions. The variety amplius has larger oogonia than the type and more nearly approaches the size of Oe. pyriforme (No. 100). 104. Oe. loricatum Hirn. (Pl. XXXVI, fig. 339.) 1895, p. 22, Pl. 1, fig. 6; 1900, p. 156, Pl. XXIV, fig. 133. Monoecious; oogonium 1 (rarely 2), subpyriform-globose, sometimes subglobose, operculate, division superior; oospore subglobose or sub- depressed-globose, quite filling oogonium, spore wall smooth; antheridium 1-2, subepigynous; sperms 2, division horizontal; vegetative cell 8-11 30-75u; oogonium 23-28 X23-40u; oospore 22-26 XK 21-24y; antheridium 7-8 X 5-7. Finland. This species is similar to Oe. pithophorae (No. 106) below, but the latter has globose and slightly larger oospores. EO THE OEDOGONIACEAE 105. Oe. sphaerandrium Wittrock and Lundell. (Pl. XXXVI, fig. 337.) In Wittr. 1874, p. 7; Oe. subcapitellatum Hirn 1895, p. 13, Pl. 1, fig. 1; Hirn 1900, p. 155, Pl. XXIV, figs. 129 and 130; Borge 1913, p. 31, fig. 2. Monoecious; oogonium 1-4, subpyriform- to subdepressed-globose, operculate, division a little above median; oospore subdepressed- or depressed-globose, nearly filling oogonium, spore wall smooth, antheridium to 6-seriate, subepigynous or scattered; sperm 1; vegetative cell capitellate, sometimes nodulose; basal cell subhemispherical, terminal cell piliform; vegetative cell 4-10 X6—40u; oogonium 18-23 < 18-23; oospore 16-21 14-19; antheridium 6-8 X 5-6u. Austria, Finland, Germany, Sweden; Siberia. The capitellate (sometimes nodulose) vegetative cells, the small size, and supramedian operculum are characteristic. 106. Oc. pithophorae Wittrock. (Pl. XXXVI, fig. 338.) 1878, p. 141; Hirn 1900, p. 157, Pl. XXIV, fig. 134. Monoecious; oogonium 1, pyriform-globose, operculate, division superior; oospore globose, almost filling oogonium, spore wall smooth, often thickened; antheridium 1—?, subepigynous; basal cell elongate; vegetative cell 9-11X24-48y; oogonium 26-30X27-35yu; oospore 25-29 X 24-29u; antheridium 8—10X7—9u. St. Thomas, West Indies. Epiphytic on Pithophora cleveana Wittrock. Cf. Oe. porrectum (No. 97). 107. Oe. autumnale Wittrock. (Pl. XXXVI, fig. 341.) 1874, p. 11; Hirn 1900, p. 167, Pl. XXVI, fig. 151. Monoecious; oogonium 1, obovoid-globose, operculate, division superior; oospore globose or subglobose, completing oogonium (or nearly so), spore wall smooth; antheridium 1-2, subepigynous, hypogynous, or scattered; sperms 2, division horizontal; basal cell elongate; terminal cell broadly apically acute; vegetative cell 16-2025—-50u; oogonium 39-45 X45—-51u; oospore 37-42 X 37-44; antheridium 15-18 X9-10y. United States: Pennsylvania; Finland, Italy, Sweden, Latvia. Cf. Oe. crisbum (No. 109). 108. Oe. obesum (Wittrock) Hirn. (Pl. XXXVII, fig. 347.) 1900, p. 166, Pl. XXVI, fig. 148; Oe. pyrulum Wittr. var. obesum Wittr. 1876, p. 44, Pl. 18, fig. 20. Monoecious; oogonium 1, obovoid-globose, operculate, division superior; oospore globose, not quite filling oogonium, spore wall smooth, often thickened; antheridium 1-2, subepigynous or more rarely sub- OEDOGONIUM yas hypogynous; sperms 2, division horizontal; vegetative cell 12-15x 35-75u; oogonium 40-43 X 38-44; oospore 33-35 X 33-85y; antheridium 11-14X 10-15z. United States: Massachusetts; Austria, Bulgaria, Finland, France; Ceylon; Brazil. Cf. Oe. crispum (No. 109). 109. Oe. crispum (Hassall) Wittrock. (Pl. XXXV, fig. 319.) Vesiculifera crispa Hass. 1845, p. 203, Pl. 52, fig. 8; Oe. crispum Wittr. 1874, p. 10; 1876, p. 45; Oe. rostellatum Pringsh. 1858, p. 69, Pl. 5, fig. 1; (?) Vestculifera vernalis Hass. 1848, p. 434; (?) V. candollei Hass. 1845, p. 208, Pl. 52, fig. 9; Oe. vernale Wittr. 1874, p. 10; Oe. crispum (Hass.) Wittr. var. elongatum Wittr. 1876, p. 45; Oe. hispanicum Lewin 1888, p. 16, Pl. 2, figs. 40-42; Hirn 1900, p. 159, Pl. XXV, figs. 188 and 139; Oe. crispum (Hass.) Wittr. f. vernale (Hass.; Wittr.) Hirn 1900, p. 161, Pl. XXV, fig. 141; Heering 1914, p. 214, fig. 334; Tiffany 1926, p. 101, Pl. III, fig. 29. Monoecious; oogonium usually 1, obovoid-globose, operculate, division superior; oospore globose or subglobose, quite filling the oogonium, spore wall smooth; antheridium 1—5, subepigynous or hypogy- nous; sperms 2, division horizontal; basal cell elongate, terminal cell apically obtuse; vegetative cell (10—) 12-16 X35-80u; oogonium 37-45 x 41—53u; oospore 35-43 X37-43y; antheridium 8-14 7-12u. United States: Colorado, Pennsylvania, California, Michi- gan, Mississippi, [linois, Ohio, Iowa, Alaska; Austria, England, Denmark, Finland, France, Germany, Italy, Spain, Sweden; Africa; Asia; Australia; Bolivia; Patagonia; Greenland; Van- couver, British Columbia. 109a. Form granulosum (Nordstedt) Hirn. (Pl. XXXV, fig. 322.) 1900, p. 162, Pl. XXV, fig. 142; Oe. crispum (Hass.) Wittr. var. granulosum Nordst. 1877, p. 24; De Toni 1889, p. 37. Oogonium subglobose, filled by oospore; antheridium subepigynous; spore wall of oospore punctate-granulate; vegetative cell 14-17 35-63y; oogonium 40-43 x 42—45u; oospore 37-40 X 37—40u; antheridium 11-13 8-11. Sweden. 109b. Form inflatum Hirn. (Pl. XXXV, fig. 323.) 1900, p. 161, Pl. XXV, fig. 140; Oe. vesicatum Link var. flavescens Kuetz. in Rabenh. Alg. Sachs. No. 271, 1853; Oe. rostellatwm Pringsh. in ibid. No. 2275, 1872. Oogonium obovoid-globose; vegetative cell 12-16 X35—-95y; oogonium 40-50 X 45-53; oospore 37-45 X 38—-45u; antheridium 8-12 *9-12u. United States: Michigan, Florida, Mississippi; Switzerland, Sweden, Germany; South Africa. 114 THE. OEDOGONTACEAE 109c. Var. gracilescens Wittrock. | (Pl. XXXV, fig. 321.) In Wittr. and Nordst. Alg. Exs. No. 509, 1883; Oe. Lagerheimii Wittr. in ibid. No. 1018, 1893; Hirn 1900, p. 162, Pl. XXV, fig. 148; P. B. A. No. 518. More slender than the type; oogonium varying from obovoid- globose to subellipsoid; oospore globose to ovoid; vegetative cell 10-14 30-70u; oogonium 33-39 < 33-51u; oospore 32-37 X 33-42u; antheridium 9-10 X 7-9. United States: Massachusetts, Iowa, Missouri, Ohio, Illinois, Mississippi, Louisiana, Minnesota; Austria; Brazil; Morocco, Angola. 109d. Var. hawaiense Nordstedt. (Pl. XXXV, fig. 320.) 1878, p. 20, Pl. 2, figs. 9 and 10; Hirn 1900, p. 165, Pl. XXVI, fig. 147. Oogonium subobovoid-globose to pyriform-globose, not filled by oospore; terminal cell mucronate or shortly setigerous; vegetative cell 10-16 X 20-64; oogonium 30-388X31-88u; oospore 27-32 27-33y; antheridium 8-11 6-8u. Hawail. 109e. Var. uruguayense Magnus and Wille. (Pl. XXXV, fig. 324.) In Wille 1884, p. 39, Pl. 2, fig. 63; Oe. crispum (Hass.) Wittr. f. gracilis in Wittr. and Nordst. Alg. Exs. No. 704, 1886; Hirn 1900, p. 164, Pl. XXVI, fig. 145; Oe. crispum (Hass.) Wittr. var. uruguayense M. & W. f. proprium Hirn 1900, p. 164, Pl. XXVI, fig. 146. Oogonium subobovoid-globose, usually filled by oospore; antheridium subepigynous or hypogynous or scattered; vegetative cell 10-14 16-5lu; oogonium 30-88 X 30-45y; oospore 27-35 X 27-374; antheridium ~ 8-13 X 6-12p. United States: Pennsylvania; Argentina, Brazil. Oe. crispum is perhaps the commonest monoecious member of the genus among the operculate forms. Its vegetative cells are more slender than those of Oe. autumnale (No. 107) and there is less variation in the relative size of its oogonium and oospore than in Oe. obesum (No. 108). The forms and varieties of the species are separable from one another and the type largely on the basis of relative shapes and sizes of vegetative and reproductive cells. (See key). 110. Oe. rupestre Hirn. (Pl. XXXVI, fig. 345.) 1900; pz 168) sR. XexaVay fie. 1522 Monoecious; oogonium 1, suboboviform-globose, operculate, division superior; oospore globose, not filling oogonium, spore wall smooth; antheridium 1-3, subepigynous or hypogynous; sperms 2, division OEDOGONIUM, 115 horizontal; vegetative cell 20-27 26-674; oogonium 48-58 x48-60y; oospore 43-50 (-54) 43-50 (—54)u; antheridium 18-22 9-11. Austria, France, Ireland, Latvia. 110a. Form pseudautumnale Hirn. (Pl. XXXVI, fig. 346.) 1900, p. 169, Pl. X XVII, fig. 153. A little smaller; vegetative cell 20-25 30-65u; oogonium 44-49 45-55u; oospore 43-47 X48-47u; antheridium 19-22 10-14u. United States: Mississippi; France, Germany. Oe. rupestre has larger vegetative cells than any of the other monoecius operculate species with obovoid-globose to subglobose oogonia. It is to be compared with Oe. crisbum (No. 109). F. pseudautumnale has smaller fruiting cells than” the type. 111. Oe. ahlstrandii Wittrock. (Pl. XXXVIII, fig. 358.) In Wittr. and Nordst. Exs. No. 401, 1882; Hirn 1900, p. 183, Pl. XXIX, fig. 179; Collins 1909, p. 247. Monoecious; oogonium 1, ellipsoid, operculate, division superior; oospore ellipsoid, filling oogonium, wall smooth; antheridium 1-2, hypogynous; sperms 2, division horizontal; terminal cell apically obtuse; vegetative cell 10-18X30-180u; oogonium 35-42 57-69u;. oospore 34-41 X53-62u; antheridium 13-17 X9-12u. United States: New York; Sweden, England. The large oogonium of this species separates it from all other ellipsoid, operculate, monoecious forms, except the still larger Oe. pachydermum, below. 112. Oe. pachydermum Wittrock and Lundell. (Pl. XXXIX, figs. 377 and 378.) In Wittr. 1870, p. 125; Hirn 1900, p. 188, Pl. XXX, fig. 187. Monoecious; oogonium 1 (rarely 2), ellipsoid, operculate, division superior, wall frequently thickened; oospore ellipsoid, not filling oogonium, spore wall smooth; antheridium 1-3, hypogynous or sub- epigynous, often terminal; sperms 2, division horizontal; basal cell elongate; terminal cell apiculate; vegetative cell 21-2734-120y; oogonium 50-70 75-100u; oospore 40-60 * 50-80u; antheridium 18-21 X 10-12u. Finland, Sweden. Cf. Oe. ahlstrandiut (No. 111). 116 ia) OE DOIG ON EAC EAE 113. Oe. kirchneri Wittrock. (Pl. XXXVIII, fig. 371.) F ae p. 104; Oe. alternans Kirch. 1878, p. 53; Hirn 1900, p. 183, Pl. XXIX, Ze i Monoecious; oogonium 1, ellipsoid or obovoid-ellipsoid, operculate, division superior; oospore of same form as oogonium, nearly filling oogonium, spore wall smooth; antheridium 1-2, hypogynous and alternating with oogonium; sperms 2, division horizontal; terminal cell obtuse; vegetative cell 8-15x16-60u; oogonitum 20-2434 -48y; oospore 19-23 X 32-41; antheridium 9-13 X4—7u. Germany. Chiefly characterized among those with ellipsoid, operculate oogonia by the alternation of oogonium and antheridium. 114. Oe. gracillimum Wittrock and Lundell. (Pl. XXXVIII, fig. 373.) In Wittr. 1874, p. 15; Wolle 1887, p. 74, Pl. 75, fig. 2; Hirn 1900, p. 184, Pl. XXIX, fig. 180; Collins 1909, p. 247; Heering 1914, p. 218, fig. 318; Tiffany 1926, p.100; Piva eg. 9. Monoecious; oogonium 1, oblong, operculate, division superior; oospore oblong-ellipsoid, not filling oogontum, spore wall smooth; antheridium 1; sperms 2, division horizontal; basal cell elongate; vegetative cell 4-7 x 16-42y; oogonium 14-19 X 34—40y; oospore 13-17 X ' 24-32u; antheridium 3-5 X4-7n. United States: Iowa, Pennsylvania, Michigan, Illinois, Ohio, Mississippi, Kentucky; Sweden; Angola. 114a. Form majus West and West. 1897, p. 4; Hirn 1900, p. 184. Vegetative cell 6-7X20-40u; oogonium 20-2332-35u; oospore 17 X24u. Africa. Oe. gracillimum almost invariably has some oogonia with imperfectly developed oospores. 115. Oe. oblongellum Kirchner. (Pl. XXXVIII, fig. 372.) In Hirn 1900, p. 182, Pl. X XIX, fig. 177. Monoecious; oogonium 1, ellipsoid-obovoid, operculate, division superior; oospore ellipsoid, nearly filling oogonium, spore wall smooth; antheridium 1-2, hypogynous or scattered; sperms 2, division hori- zontal; terminal cell obtuse; vegetative cell 7-9X 14—-35yu; oogonium 20-24 & 25-33u; oospore 18-22 X 24-30yu; antheridium 6-8 X4—12u. United States: Illinois, Mississippi; Germany; Burma. Oe. oblongellum is near Oe. oblongum, below, but the latter almost invariably has oogonia not filled lengthwise by oospores; the former has oogonia nearly completely filled.: OEDOGONIUM tity 116. Oe. oblongum Wittrock. (Pl. XXXVIII, fig. 367.) 1872, p. 2; 1874, p. 15; Hirn 1900, p. 185, Pl. X XIX, fig. 181; Heering 1914, p. 218, fig. 319: Collins 1918, p. 66; Tiffany 1926, Oe INO, JEN, INU sakeg, AAS Monoecious; oogonium 1, oblong, operculate, division superior; oospore ellipsoid to ovoid, not filling oogonium longitudinally, spore wall smooth; antheridium 1-3, sperms 2, division horizontal; basal cell elongate; vegetative cell 6-11X20-86u; oogonium 20-2641-60y; oospore 19-23 X 30-36u; antheridium 6—9 X 7-9u. United States: Iowa, Illinois, Mississippi; Siberia; New Caledonia; India; Austria, Denmark, Finland, Germany, Russia, Norway, Latvia, Sweden. 116a. Form majus (Nordstedt) Hirn. (Pl. XXXVIII, fig. 370.) 1900, 185, Pl. XXIX, fig. 182; Oe. oblongum Wittr. var. majus Nordst. in Wittr. 1876, Ds 45, JPAL, 1B}, anise, 2all Vegetative cell 8-11X35-75u; oogonium 26-28 42-50u; oospore 22-26 X 31-34; antheridium 8-9 X9-10u. United States: Michigan; Finland, Italy, Sweden; Morocco. 116b. Form sphaericum (Hallas) Hirn. (Pl. XXXVIII, figs. 368 and 369.) 1906, p. 18, Pl. III, fig. 12; Oe. sphaericum Hallas 1905, p. 406, fig. 13. Oospore globose; vegetative cell 6-11 20-85u; oogonium 21-28 30-52u; oospore 16-26 X 16-26; antheridium 8X6; basal cell 9X 72u. Denmark. Cf. Oe. oblongellum (No. 115). The f. sphaericum is easily separated from the species by its globose oospore; f. majus has slightly larger oogonia. 117. Oe¢e. itzigsohnii De Bary. (Pl. XXXIX, figs. 379 and 380.) 1854, p. 56, Pl. 3, figs. 29-32; Wittr. 1870, p. 123; Oe. platygynum Wittr. in Eichler 1893, p. 2, Pl. 9, fig. 2; Hirn 1900, p. 177, Pl. XXVIII, fig. 167. Monoecious; oogonium 1, ellipsoid, with median, conically obtuse projections, appearing stellate in vertical view, with 7—10 radiations, operculate, division inframedian; oospore globose, not completing oogonium, spore wall smooth; antheridium 1-2; terminal cell apically obtuse or apiculate; vegetative cell 8-10 25-60u; oogonium 34-40 32—40u; oospore 20-23 & 20-23u; antheridium 8-9 X 8-15u. United States: Massachusetts; Germany, Poland, Sweden, Austria, England, Bulgaria, Denmark, Latvia, Russia, France. 118 THE OEDOGONIACEAE 117a. Form heteromorphum Hirn. (PI. XXXIX, fig. 381.) 1900, p. 178, Pl. XXVIII, fig. 168. Processes on oogonium intermediate between conically obtuse projections and mammiform protuberances; vegetative cell 6-9X 30-110u; oogonium 33-40 35-40y; oospore 20-25 x 20-25n. Germany, Sweden. = 117b. Var. minus West. (Pl. XXXIX, fig. 382.) 1893, p. 97; 1897, p. 4; Hirn 1900, p. 178, Pl. XXVIII, fig. 169. Smaller; processes of oogonium acutely rounded; vegetative cell 5-7 X 25-70u; oogonium 28-30 X 28-30u; oospore 16-20 X 16—20y. England. Oe. itzigsohnii is near Oe. mammiferum below, but differs in having conically obtuse projections, instead of mammiform projections, on the oogonia. Var. minus is slightly smaller than the type and f. heteromorphum has oogonial projections somewhat intermediate between the species proper and Oe. mammiferum. 118. Oe. mammiferum Wittrock; Nordstedt. (Pl. XXXIX, figs. 383-385. ) - Wittr. 1874, p. 16; Nordst. 1877, p. 25, Pl. 3, figs. 4-6; Oe. huillense Wesi 1897, p. 5, Pl. 365, figs. 7 and 8; Hirn 1900, p. 175, Pl. XXVIII, figs. 165 and 166. Monoecious; oogonium 1 (rarely 2-3), ellipsoid, with mammiform projections appearing as 7-9 radiations seen vertically, operculate, division inframedian, very narrow; oospore globose or subdepressed- . globose (rarely depressed-globose), not filling oogonium, spore wall smooth; antheridium 1, subepigynous; basal cell elongate; vegetative cell 5-8 X20-56u; oogonium 20-28 X20-30u; oospore 12-17 (-20) Xx 12—16u; antheridium 6X 7u. United States: Massachusetts; Norway, Sweden; India; Africa. : Cf. Oe. ttzigsohni above. 119. Oe. undulatum (Brebisson) Al. Braun; Wittrock. (Pl. XLII, fig. 407. ) Conferva undulata Breb.; Oe. undulatum Al. Braun in De Bary 1854, p. 94; Wittr. 1870, p. 130; Cymatonema confervaceum Kuetz. 1849, p. 375 and 1853, p. 15, Pl. 47, fig. 1; Borge 1899, p. 4, Pl. 1, fig. 2; Oe. undulatum A. Br. var. interrupte- incisum Schroeder 1897, p. 10, Pl. 2, fig. 1; Oe. sp. Moebius 1894, p. 320, Pl. 1, fig. 21; Oe. undulatum A. Br. var. Moebiusii Schmidle 1896, p. 297, Pl. 9, fig. 1; Oe. undulatum (Breb.) Al. Br. var. Moebiusii Schmidle in Borge 1896, p. 5; Hirn 1900, - p. 257, PI. XLV, figs. 272-275. : Dioecious, nannandrous, gynandrosporous or idioandrosporous; oogonium 1-2, subglobose or ellipsoid-globose, operculate, division inferior, wide; oospore globose or subglobose, quite filling oogonium, OEDOGONIUM 119 spore wall smooth, sometimes thick; androsporangium to 7-seriate; vegetative cell undulate (4 undulate constrictions); basal cell elongate, not undulate; terminal cell (sometimes oogonium) apically obtuse; dwarf male elongate-obconic, usually on suffultory cell, rarely on other vegetative cell near oogonium, antheridium interior; vegetative cell 15-22 45-1104; oogonium 48-56X50-75u; oospore 42-50 42-52 (-60)u; androsporangium 15-21X7-14y; dwarf male 8-10X48-65 (—70) u. United States: Michigan, Florida, Indiana; Uruguay; Aus- tralia; Manchuria, China; Austria, England, Finland, -France, Germany, Norway, Poland, Sweden, Russia, Latvia; Columbia; Africa (Victoria). 119a. Var. americanum Transeau. (Pl. XLII, fig. 408.) 1917, p. 232. Vegetative cell as in type; oogonium much larger; vegetative cell 15-22 X 45-110u; oogonium 58-68 x 60-80; oospore 48-60 X 48-56y. United States: Michigan. 119b. Form senegalense (Nordstedt) Hirn. (Pl: XLII, fig. 409.) 1900, p. 261, Pl. XLV, figs. 276 and 277; Oe. undulatum (Breb.) A. Br. var. senegalense Nordst. 1880, p. 138; P. B. A. No ees Oogonium and oospore smaller than the type; dwarf male shorter; oogonium to 5-seriate; vegetative cell with three median swellings repand, the terminal swelling entire, 15-22 45-110u; oogonium 42-52 x 44-63; oospore 37-44 K 36-44; androsporangium 15-19X9-18u; dwarf male 6-8 X 37-44u. United States: Massachusetts; Africa: Senegal. The undulate vegetative cells are characteristic. It bears some relation in the vegetative state to Oe. nodulosum (No. 96). The var. americanum has considerably larger oogonia than the .type and f. senegalense has slightly smaller fruiting cells. A number of variations of this species are on record in algological literature, but the two above seem the only really tenable ones outside the species proper. 120. Oe. nebraskense Ohashi. (Pl. XLII, figs. 410-413. ) Oe. nebraskensis Ohashi 1926, p. 213, figs. 1-20. Dioecious, nannandrous, gynandrosporous; oogonium 1-4, flask- shaped or obovoid, pore supramedian; oospore subspherical or ovoid, not quite filling oogonium, outer layer of spore wall smooth, middle layer punctate, inner layer smooth; androsporangium 1-4, basal cell elongate; terminal cell attenuate-obtuse; dwarf male curved, on suffultory cell, 120 LHE OE DOIGONTACEAE antheridium exterior, 1-4; vegetative cell slightly capitellate; filament 20-41 (-50) celled; vegetative cell, terminal 9-12170-805yu, median 20-27 X 57—160u, basal 22-35 X 79-230; suffultory cell 41-58 X 93-130,; oogonium 60-67X70-79u; oospore 53-64 60-76u; androsporangium 20-25 X 2240u; dwarf male stipe 12-1947-68u; antheridium 9-13 17-20u. United States: Nebraska (near Lincoln). The only nannandrous species combining the characters of supramedian pore and punctate oospore. 121. Oe. aster Wittrock. (Pl. XLII, fig. 416.) 1872, p. 4; 1874, p. 29; De Toni 1889, p. 62; Hirn 1900, p. 198, Pl. XXXII, fig. 202; Fremy and Meslin 1926, p. 124, fig. 9. Dioecious, nannandrous; oogonium 1, subdepressed-globose, pore median; oospore subdepressed-globose or subglobose, not completely filling oogonium; outer layer of spore wall echinate; suffultory cell sometimes a little swollen; terminal cell obtuse; dwarf male a little curved, on suffultory cell, stipe sometimes 2-celled, antheridium exterior, 1-2; vegetative cell 7-13 X50-110y; oogonium 33-35 X 34-39; oospore (with spines) 31-32 X 25-30; dwarf male stipe 6—7 X 20-25; antheridium 5-6 X 7-8y. United States: Illinois; Sweden,-Germany, Latvia, France; Ceylon. Oe. aster is near Oe. pugens (No. 125) but the latter is larger in all dimensions. 122. Oe. hystricinum Transeau and Tiffany. , (Pl. XLII, fig. 414.) 1919, p. 240, Pl. XIV, figs. f-i; Tiffany 1926, p. 102, Pl. VIII, figs. 85 and 86. Dioecious, nannandrous, idioandrosporous; oogonium 1, globose or somewhat obovoid, pore median; oospore globose to subglobose, nearly filling the oogonium, outer spore wall densely covered with spines; suffultory cells swollen; androsporangium 3-6; terminal cell obtuse; basal cell elongated; dwarf male nearly straight, resting on the suffultory cell, antheridium exterior, 1; female vegetative cell 8-15 x 42-100y, male 6-9 X 50-67; suffultory cell 16-19 42-70u; oogonium 30-40 X 36-53. ; oospore (including spines) 23-38 X28-43u; androsporangium 6-8 X 8—15u; dwarf male stipe 6-10 X 20-32u; antheridium 5-6 X 6—10y. United States: Illinois, Iowa. This species is near Oe. hystrix, below, but differs in its smaller size and in its swollen suffultory cells. 123. Oe. hystrix Wittrock. (Pl. XLII, fig. 417.) 1870, p. 133; Wolle 1887, p. 87, P1. 84, fig. 8; Hirn 1900, p. 213, Pl. XXV, fig. 218. Dioecious, nannandrous, gynandrosporous (or possibly idioan- drosporous); oogonium 1, ellipsoid, pore median; oospore ellipsoid, OED OGONTUM LT nearly filling oogonium, outer spore wall echinate; androsporangium _ 1-3; terminal cell obtuse; dwarf male slightly curved, on suffultory cell; antheridium exterior, 1; vegetative cell 17-2830-120u; oogonium 38-48 X 45-654; oospore 37-46 43-554; androsporangium 17-18 13-18; dwarf male stipe 10-11 X 22—25n; antheridium 6-8 X9-14y. United States: Pennsylvania; Finland, Germany, Sweden. 123a. Var. canadense Tiffany. (Pl. XLII, fig. 418.) 1929, p. 74; Oe. hystrix Wittr. in Skuja 1927, p. 99, Pl. II, fig. 13. Pore inframedian; suffultory cell enlarged; vegetative cell 14-25 80-125u; suffultory cell 24-3064-72u; oogonium 40-53 52-64y; oospore 38-48 X 40-60u; androsporangium 16-20 15-30y; antheridium 7-8 X 8-14u; dwarf male stipe 9-12 28-40u. British Columbia ; Latvia. 123b. Var. subglobosum Wittrock. (Pl. XLII, fig. 419.) 1872a, p. 22, Pl. 1, fig. 7; Hirn 1900, p. 214, Pl. XX XV, fig. 219. Smaller; oogonium and oospore subglobose; vegetative cell 17-21 35-93u; oogonium 36-3841-43u; oospore 34-3639-40u; andro- sporangium 16-18X9-14y; dwarf male stipe 1023u; antheridium tex Ups: Sweden. The species is to be compared with Oe. hystricinum (No. 122). The variety canadense differs from the type in its inframedian pore and slightly swollen suffultory cell; var. subglobosum is smaller with subglobose oogonium. 124. Oe. echinospermum Al]. Braun. (Pl. XLIII, figs. 420 and 421.) In Kuetzing 1849, p. 366; Kuetzing 1853, p. 12, Pl. 36, fig. 2; Wittr. 1870, p. 129; Hirn 1900, p. 199, Pl. XX XIII, fig. 204; P. B. A. No. 1673. Dioecious, nannandrous, gynandrosporous or idioandrosporous; oogonium 1, ellipsoid-globose or subglobose, pore median; oospore globose, quite filling oogonium, outer layer of spore wall echinate; androsporangium 1—5; dwarf male a little curved, on suffultory cell, antheridium exterior, 1-2; vegetative cell 18-3045-130u; oogonium 39-50 X 41-57; oospore (with spines) 38-47 X 38—-49u; androsporangium 21-25 X9-15u; dwarf male stipe 10-15 26-—35y; antheridium 6-12 6-L5y. United States: Illinois, Ohio, Alabama, Mississippi, Massa- chusetts, New York, New Jersey, Pennsylvania, Michigan; Austria, Scotland, England, Germany, Latvia, Finland, France, Sweden; Australia; British Columbia. E22 THE OEDOGONIACEAE 124a. Var. horridum Hirn. (Pl. XLII, fig. 422.) 1900, p. 201, Pl. XX XIII, fig. 205; Oe. echinospermum A. Br. var. Wolle 1887, p. 86, Pl. 85, figs. 6-S. Larger with longer and more dense spines; antheridium pluri- cellular. United States: Florida. The species is one of the most easily recognized among the nannandrous forms by its echinate oospore, median pore, and large dimensions (as compared with Oe. hystrix, Oe. aster, and Oe. pungens). The variety horridum has no record other than that of Wolle, and its retention in the genus is open to con- siderable question. 125. Oe. pungens Hirn. (Pl. XLIV, figs. 423 and 424.) 1900, p. 199, Pl. XXXII, fig. 203. j R Dioecious, nannandrous, gynandrosporous; oogonium 1, _ sub- depressed-globose (or nearly subglobose), pore median or a little above median; oospore subglobose, almost filling oogonium, outer spore wall echinate; androsporangium |—?, hypogynous; dwarf male a little curved, on suffultory cell, antheridium exterior, 1-2; vegetative cell 12-16 50-94u; oogonium 40-48 & 40—50u; oospore (with spines) 37-44 X 35—48y; androsporangium 14-1610-15u; dwarf male stipe 9-12 20-80n; antheridium 6-7 X 8—12u. United States: South Carolina, Illinois. Cf. Oe. aster (No. 121). 126. Oe. exospirale Tiffany. (Pl. XLIV, figs. 425 and 426.) 1924, p. 184, Pl. II, figs. 1-8; 1926, p. 102, Pl. IX, figs. 100-102. Dioecious, nannandrous, idioandrosporous; oogonium 1 (rarely 2), subglobose or obovoid-globose (rarely subhexagonal), pore median; oospore globose or subglobose, nearly filling the oogonium, spore wall of two layers: outer layer marked by 5-8 spiral ribs uniting at the poles, the polar axis always placed in a transverse position, never parallel with the filament, the inner layer smooth; suffultory cell swollen; androsporangium 1-6; basal cell elongate; dwarf male a little curved, situated on the suffultory cell, with exterior antheridium 1—3; vegetative cell 8-1260-88u; suffultory cell 16-2860-88u; oogonium 40-44 44-484; oospore 32-38X38-40u; androsporangium 12-16 14-20p; dwarf male stipe 14-16 X30-40y; antheridium 8-12 X 14-16n. United States: Iowa, Ohio, Mississippi. ° This species should be compared with Oe. spirale (No. 128) and Oe. illinoisense (No. 127). It differs from the former in having smaller oogonia and oospores and in its tumid suffultory OEDOGONIUM £23 cells; it is separated from the latter on the basis of smaller dimensions. 127. Oc. illinoisense Transeau. (Pl. XLIV, figs. 431-433. ) - 1914, p. 299, Pl. XXIX, figs. 6-8. Dioecious, nannandrous, gynandrosporous; oogonium 1, sub- . globose to obovoid-globose, pore median; oospore globose or subglobose, nearly filling oogonium, outer spore wall with 4-7 spiral ribs, uniting at poles, polar axis always transverse to axis of filament; suffultory ‘cell enlarged; androsporangium 1-5; basal cell elongate; dwarf male slightly curved, on suffultory cell; antheridium exterior, 1-4; vegetative cell 13-18 X80-140u; suffultory cell 32-40 50-80u; oogonium 51-60 60-70u; oospore 45-56X48-664; androsporangium 13-17 17—-22u; dwarf male stipe 14-17 37—57y; antheridium 9-12 15—-238u. United States: Illinois, Mississippi, Kentucky. Cf. Oe. exospirale, above. 128. Oe. spirale Hirn. (Pl. XLIV, figs. 427 and 428.) 1900, p. 201, Pl. XX XIII, fig. 206. Dioecious, nannandrous, idioandrosporous; oogonium 1, subglobose or obovoid-globose, pore median; oospore globose or subglobose, not filling oogonium, spore wall double: outer layer with 4-7 spiral ribs, anastomosate, united at the poles, inner layer smooth; androsporangium 1-3; basal cell elongate; dwarf male a little curved, near oogonium, antheridium exterior, 1; vegetative cell 20-33 40-130u; oogonium 52-60 X52-60u; oospore 46-5646-56u4; androsporangium 17-22 11-14y; dwarf male stipe 11-16 41-59; antheridium 10-11 18—20z. Asia (Java). 128a. Var. acutum West and West. (PI. XLIV, fig. 430.) 1902, p. 128, Pl. 17, figs. 3-5; Hirn 1906, p. 22, Pl. III, fig. 14. Spiral ribs larger, irregularly and acutely dentate; vegetative cell 20-26 X70-106u; oogonium 46-56 54-60; oospore 37-45% 3745p; dwarf male stipe 9-12 34-44; antheridium 8-9 x 14—-18u. United States: Mississippi; Ceylon, India. 128b. Var. latviense Tiffany. Pl. XLIV, fig. 429.) 1929, p. 75; Oe. spirale Hirn f. in Skuja 1927, p. 102, Pl. II, fig. 14 a-b. Pore supramedian or superior; vegetative cell 16-2065—-120y; oogonium 49-6065u; oospore (without ribs) 35-45x35—-45y, not filling oogonium, outer wall with 5-6 spirally arranged ribs; dwart male 12 50u. 432 Latvia. 124 ree Ol DICK ON TEANGA AGE: The species should be compared with Oe. exospirale (No. 126). The variety acutum has smaller oospores and larger ribs; var. latviense has a distinctly above-median pore which is sometimes nearly superior. 129. Oc. depressum Pringsheim. (Pl. XLVI, fig. 446.) 1858, p. 69, Pl. 5, fig. 5; Hirn 1900, p. 249, Pl. XLII, fig. 261. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), depressed globose, pore median; oospore depressed globose, not filling oogonium; androsporangium 2-celled; dwarf male oblong-obovoid, on oogonium, antheridium interior; vegetative cell 8-9 x 25-54; oogonium 28 X 26u; oospore 23 X 17-18u; dwarf male 4—5 x 14-16u. Germany; Greenland. Cf. Oe. semiapertum, below. 130. Oe. semiapertum Nordstedt and Hirn. (Pl. XLVI, fig. 445.) In Hirn 1900, p. 250, Pl. XLIT, fig. 262. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), subhexagonal-globose to subpyriform-globose, pore median, rimiform, extending nearly half way round the oogonium; oospore globose or sub- globose, not filling oogonium, spore wall smooth; androsporangium 1-3, hypogynous or subepigynous; terminal cell apically obtuse; dwarf male subobovoid, on oogonium, antheridium interior; vegetative cell 9-12 X38-105yu; oogonium 32-35 X 33-40u; oospore 25-29 x 25-30; androsporangium 9-10 10-14y; dwarf male 8-9 Xx 14—15n. French Guiana. This species and Oe. depressum, above, are the smallest of nannandrous, medianly poriferous members of the genus having smooth and nearly globose oospores. Oe. depressum is separated by its smaller size and non-rimiform pore. 131. Oc. gallicum Hirn. (Pl. XLVII, fig. 453.) NI ay p. 197, Pl. XXXII, fig. 201; Oe. flavescens Hass. in Roumeguere Alg. Exs. IN'O:: fo. Dioecious, nannandrous, (?) idioandrosporous; oogonium 1-2, subhexagonally globose, pore a little above median; oospore of same form as oogonium and quite filling it, spore wall smooth; dwarf male suberect, on suffultory cell (rarely oogonium), antheridium exterior, 1-2; vegetative cell 17-22 51-120u; oogonium 43-48 x 44-54; oospore 41-46 X39-44y; dwarf male stipe 11-16 26-80yu; antheridium 8-9X (1 1p. France. Cf. Oe. braunii, below. OEDOGONIUM 125 132. Oe. braunii Kuetzing; Pringsheim. ae XLVI, fig. 458.) Kuetzing 1849, p. 366; 1853, 12, Pl. 36, fig. 3; Pringsheim 1858, p. 70, Pl. 5, fig. 6; Wolle 1887, ie ce), Jell 79, Gee. 6 and 7; Oe. calcareum Cleve var. gaditanum Lewin 1888, iy dks JE, Si, sales, Gas Hirn 1900, p. 194, Pl. XXXII, fig. 197; Collins 1909, p. 249: Heering 1914, De 172; Tiffany 1926, p. 102. Dioecious, nannandrous, gynandrosporous; oogonium 1, ovoid to subglobose, pore median; oospore globose, not filling oogonium, spore wall smooth; androsporangium 1-2; basal cell elongate; terminal cell apically obtuse; dwarf male usually on suffultory cell, stipe somewhat curved; antheridium exterior, 1; vegetative cells 13-15 25-60y; suffultory cell 16-20X28-50u; oogonium 380-37 33-43"; oospore 27-33 X 27-334; androsporangium 13-15X11-12u; dwarf male stipe 7-12 X 20-28; antheridium 5-8 9-10u. United States: Iowa, Illinois, New Jersey, Pennsylvania, Michigan; Austria, England, Denmark, Finland, France, Ger- many, Spain, Ireland, Latvia, Norway, Sweden; Africa; British Columbia. 132a. Var. hafniense (Hallas) Hirn. (Pl. XLVII, figs. 460-462.) 1906, p. 10, Pl. III, fig. 13; Oe. hafniense Hallas 1905, p. 398, fig. 1. A little smaller; idioandrosporous; oospore globose or angular- globose; vegetative cell 12-15X25-60y; oogonium 23-30 28-35y; oospore 21—28 X 21-284; dwarf male stipe 6-812-21u; antheridium Cope: Denmark. 132b. Var. zehneri Tiffany. (Pl. XLVII, fig. 459.) 1927, 95 204, Pil EX fig. 2. Somewhat larger in all dimensions; oospore ovoid; vegetative cell 12-24 34-72u; suffultory cell 21-32X48-52u; oogonium 40-50 48-60; oospore 3444%X36-50u; dwarf male stipe 8-10 16-24u; antheridium 7-8 X 8-12u. United States: Indiana. The species is near, but smaller than, Oe. gallicum (No. 131) and Oe. flavescens, below. Var. hafniense is smaller than the type and is idioandrosporous; var. zehnerit is somewhat larger than the species and has ovoid oospores. 133. Oc. flavescens (Hassall) Wittrock). (Pl. XLIX, fig. 471.) (?) Vesiculifera flavescens Hass. 1845, p. 206, Pl. 53, fig. 9; Oe. flavescens Wittr. 1870, p. 127; Oe. flavescens (Hass.) Wittr. var. gynandrosporum Hirn 1895, p. 16; Hirn 1900, p. 196, Pl. XXXII, figs. 199 and 200; Collins 1909, p. 249; Heering 1914, p. 174, fig. 232; Tiffany 1926, p. 103, Pl. IX, fig. 95. Dioecious, nannandrous, idioandrosporous or gynandrosporous; oogonium 1, ellipsoid-globose to subglobose, pore median; oospore 126 THE QEDOGONIACEAE globose, not quite filling oogonium, spore wall smooth; androsporangium 1-9; dwarf male somewhat curved, on the suffultory cell; antheridium 1-2; vegetative cell 18-23 X72-140y; oogonium 49-52 X 51-60; oospore 45-49 X45-49u; androsporangium 17-208-18u; dwarf male stipe 11-12 36—45y; antheridium 9-10 X 15-20u. United States: Ohio, Mississippi, Alabama, Massachusetts, Minnesota, Iowa; England, Sweden, Finland. Cf. Oe. braunit (No. 1382). 134. Oe. manschuricum Skvortzow. (Pl. XLVI, fig. 442.) 1926, p. 434, fig. &. Dioecious, nannandrous; oogonium 1, globose, pore supramedian; oospore globose or nearly so, not quite filling oogontum, outer spore wall echinate; dwarf male broadly egg-shaped, unicellular, on oogonium; vegetative cell 14-17X56-85u; oogonium 30-31X37-38y; oospore 26-28 X 26-30u; dwarf male 13-24 X 20-87u. North Manchuria. Characterized by its echinate oospores and supramedian pores. To be compared with Oe. hystricinum (No. 122) and Oe. echinospermum (No. 124). 135. Oe. sexangulare Cleve. (Pl. XLVII, fig. 454.) In Wittr. 1870, p. 131; Wolle 1887, p. 82, Pl. 79, figs. 8 and 9; Oe. hexagonum Kuetz. i1 Roumeguere Alg. Exs. No. 294 and Oe. vestcatum Link f. fuscescens Dupray in loc. cit. No. 687; Hirn 1900, p. 211, Pl. XX XV, fig. 216; P. B. A. No. 1679. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), ~ sexangular-ellipsoid, pore a little above median; oospore same form as oogonium and nearly filling it, spore wall smooth; suffultory cell some- times slightly tumid; androsporangium 1-3; dwarf male on suffultory cell, a little curved, stipe of 2-3 cells, antheridium exterior, 1; vegetative cell 9-16 X30-110u; oogonium 29-33 X 33-394; oospore 27-31 X31-36y; androsporangium 13-14X10-14u; dwarf male stipe 7-9X21-30,; ' antheridium 6-7 X 9-12uy. United States: Indiana, Mississippi, New York, Louisiana, Pennsylvania, Kentucky, Michigan; Austria, France, Norway, Sweden. 135a. Var. angulosum (Hallas) Hirn. (Pl. XLVU, figs. 455 and 456.) 1906, p. 21, Pl. III, fig. 17; Oe. angulosum Hallas 1905, p. 402, fig. 7. Smaller, oospore not filling oogonium; vegetative cell 10-14 15-54y; oogonium 19-30 30-42u; oospore 17—28X21-30u; dwarf male stipe 6-7 X 18-21u; antheridium 6X 7u. Denmark. OEDOGONIUM 1 135b. Var. majus Wille. (Pl. XLVI, fig. 457.) 1880, p. 68; Hirn 1900, p. 212, Pl. XXV, fig. 217. Larger, pore median; vegetative cell 15-2330-68u; oogonium 36-42 (-48) x (36-) 41-45; oospore 34-40 X39-43yu; androsporangium 14-18 X8-10yu; dwarf male stipe 7-9 X 18-30u; antheridium 6-8 X6-10y. United States: Mississippi, Massachusetts; Austria, Finland, - Germany, Norway, Sweden. The species is readily identified among the nannandrous forms by its sexangular-ellipsoid oogonia and oospores. Var. angulosum is smaller and var. majus is larger than the species. 136. Oc. stellatum Wittrock. ' (Pl. XLV, fig. 441.) 1870, p. 129; 1874, p. 27, Pl. 1, fig. 15; (2) Oe. spinos permum Reinsch 1875, p. 81, Pi 15; fig: 1- Hirn 1900, p. 205, Pl: XOGXTV,, fig. 210: Dioecious, nannandrous, gynandrosporous; oogonium 1-3, obovoid- globose, pore superior; oospore globose, quite filling oogonium, outer spore wall with 4—7 somewhat spirally arranged ribs, appearing definitely ‘dentate on the margin, sometimes anastomosate; androsporangium 1-3, usually subepigynous; basal cell elongate; terminal cell slender, sub- hyaline, apically obtuse; dwarf male suberect, on suffultory cell, antheridiumi 1—2; vegetative cell 15-35 40-225u; oogonium 51-64 56-70u; oospore (with ribs) 50-58 X50-58y; androsporangium 14-19 13—20u; dwarf male stipe 11-13 X 45-52y; antheridium 6-9 X 8-13u. United States: Alabama, Florida; Africa; Brazil; Australia; | Finland, Germany, Italy, Sweden; Ceylon. This alga is often placed with the species having spirally arranged ribs on the oospore. The ribs are really irregular rows of dentate spines, and I have thus separated it in the key. 137. Oc. silvaticum Hallas. (Pl. XLIX, fig. 472.) 1905, p. 404; fig. 9; Hirn 1906, p. 21, Pl. III, fig..16. Dioecious, nannandrous, gynandrosporous; oogonium 1, ellipsoid- globose, pore superior; oospore globose, not filling oogonium; suffultory cell subtumid; dwarf male suberect, on suffultory cell, antheridium exterior; vegetative cell 12-15%65-120u; suffultory cell 2060,; oogonium 3750p; oospore 28X28u; androsporangium 7X 17u; dwarf male stipe 1139u; antheridium 7 X7u. Denmark. In general appearance this species resembles Oe. flavescens (No. 133), but differs in its smaller size and superior pore. The suffultory cells are not nearly so much enlarged relatively as in Oe. borisianum, below. 128 THE OE DOGONTAGE AE 138. Oc. borisianum (Le Clerc) Wittrock. (Pl. XLVIII, fig. 469.) 1874, p. 25: Prolifera borisiana Le Clerc 1817, p. 475, Pl. 23, fig. 6; Oc. borisianum Wittr. 1870, p. 182; Vesiculifera aurea Hassall 1842, p. 392; V. borisstz Hassall 1845, p- 201, Pl. 52, fig. 7; Oe. apophysatum Al. Braun in Kuetzing 1849, p. 366, and 1853, p. 12, Pl. 35, fig. 5; Oe. setigerum Vaupell 1859, p. 17, Pl. 1. (2) Androgynia mirabilis Wood 1872, p. 196, Pl. 18, fig. 2; Oe. birmanicum Wittrock 1874, p. 24; Hirn 1900, p. 217, Pl. XXXVI, fig. 223; Collins 1909, p. 255; Heering 1914, p. 178, fig. 243; Tiffany 1926, p. 103, Pl. VIII, fig. 87; P. B: A. No. 517. Dioecious, nannandrous, gynandrosporous or idioandrosporous; oogonium 1—5, obovoid or quadrangular-ellipsoid, pore superior; oospore ovoid to obovoid (often quadrangular-ovoid), not filling oogonium, spore wall smooth; androsporangium 1-7, usually in the upper part of the filament; basal cell elongate; terminal cell, often an oogonium, broadly apiculate, obtuse, or sometimes setiferous; dwarf male, some- what curved, on suffultory cell; antheridium 2; vegetative cell 15-23 x 45-140u; suffultory cell 31-88 x 50-92y; oogonium (33-) 40-50 55—90u; oospore 35-46 X48-60u; androsporangium 16-19 X 15-234; dwarf male stipe 12-18 X 35-47; antheriditum 7-10 X 11-16n. United States: Iowa, Massachusetts, Utah, Michigan, Cali- fornia, Illinois, Ohio, Pennsylvania; British Columbia; Austria, England, Denmark, Finland, France, Germany, Spain, Sweden, Latvia; Brazil, Columbia, Paraguay; Australia; India; South Africa. 138a. Var. westii Tiffany and Brown. (Pl. XLVIII, fig. 470.) In Tiffany, 1929, p. 74; Oe. borisianum (Le Cl.) Wittr. in West 1903, p. 36. Larger dimensions throughout; vegetative cell 17-19 X 130-180y; suffultory cell 31-42 105-168u;. oogonium 53-60X67-88u; oospore. 49-58 X49-58u; antheridium 17X12-13p. United States: Michigan, Mississippi; England. Oe. borisianum is one of the commonest nannandrous species. It is easily identified by the striking difference in size between the cells above the oogonia and the suffultory cells. F. westiz is larger than the type. 139. Oe. alternans Wittrock and Lundell. (Pl. XLVITII, fig. 463.) In Wittr. 1874, pp. 20; Hirn 1900, p. 251, Pl. XLIT, fig. 263. Dioecious, nannandrous, gynandrosporous; oogonium 1, subglobose, often alternating with vegetative cell, pore superior; oospore globose, filling oogonium, wall smooth, often thick; suffultory cell often sub- tumid; androsporangium 1-2, subepigynous or epigynous; basal cell elongate; terminal cell obtuse; dwarf male oblong, with an inferior constriction, on suffultory cell; vegetative cell 21-35 45-160u; sufful- tory cell 26-40 52-160yu; oogonium 65-80X65—-86u,; oospore 59-75 X 59-75; androsporangium 18-25X16-25y; dwarf male 12-17 X38—46u. OEDOGONIUM 129 Sweden. Readily characterized by its short barrel-shaped vegetative cells, often alternating with oogonia. 140. Oc. kitute G.S. West. 1907, p. 98. Dioecious, nannandrous; oogonium 1-2, subglobose or obovate- globose, pore superior; oospore globose, not filling oogonium, spore wall smooth; terminal cell obtuse; dwarf male elongate, slightly curved, smaller below, situated on oogonium or suffultory cell; antheridium interior (?); vegetative cell 26 130-180u; oogonium 76-78 x 75-80y; oospore 72X72u; suffultory cell 44 132u; dwarf male 12-13 x 58-66u. Africa. West has left no figure for this species. It is to be com- pared with Oe. borisianum (No. 138) and Oe. silvaticum (No. ae 141. Oe. victoriense G. S. West. (Pl. XLIX, fig. 473.) In Hardy 1906, p. 22; West 1909, p. 47, Pl. 6C. Dioecious, nannandrous, gynandrosporous; oogonium 1, ellipsoid- globose to ellipsoid-doliiform, pore superior; oospore exactly globose, not filling oogonium, spore wall smooth; androsporangium 5-6 celled; dwarf male on suffultory cell, stipe curved, antheridia 2; suffultory cell broadly dilated; vegetative cell 25-29 x 50-87; oogonium 49 X 57y; oospore 39X39u; androsporangium 25-26 4-8y; antheridium 7-8 4—5uy. ; Africa (Victoria). Resembles Oe. crassiusculum, below, but has single oogonia, nearly exactly globose oospores, and smaller oogonia. 142. Oe. crassiusculum Wittrock. (Pl. XLIX, fig. 474.) 1870, p. 132, 1874, p. 24; Cooke 1884, p. 162, P1. 60, fig. 5; Hirn 1900, p. 215. Dioecious, nannandrous, gynandrosporous; oogonium 1-2, globose- obovoid or subglobose, pore superior; oospore ellipsoid-globose or globose, spore wall smooth and thickened, quite filling oogonium; androsporangium 2-5; dwarf male suberect, on or near suffultory cell, antheridium exterior, 1-?; vegetative cell 27-3095-105y; oogonium 54-60 X60-75u; oospore 51-57X52-63y; androsporangium 26-28 x 10—-18y; dwarf male 13X60y; antheridium 7-9 x 9-16y. United States: Ohio, Mississippi, Connecticut; Australia; England, Sweden. UO TEE OF DIOeO NEN CB AGE: 142a. Var. arechavalete (Wittrock) Hirn. (Pl. L, fig. 478.) 1900, p. 216, Pl. XXXVI, fig. 222; Oe. arechavalete Wittr. in Wittr. and Nordst. Exs. 1886 and in De Toni 1889, p. 55. (?) Idioandrosporous; vegetative cell 21-29382-110u; oogonium 39-54 X42-65u; oospore 37—5240-574; dwarf male 14-16X40-57n; antheridium 9-14 10—16ux. Uruguay. 142b. Var. idioandrosporum Nordstedt and Wittrock. (Pl. XLIX, figs. 475 and 476.) In Wittr. & Nordst. Exs. 1879; Oe. huntit Wood in Tilden Amer. Algae 1894; Oe. crassiusculum Wittr. in P. B. A. 1895; Oe. crasstpellitum West 1899, p. 55, P1. 394, figs. 3-5; Hirn 1900, p. 215, Pi. XX XV, fig. 220; Collins 1909, p. 255; Heering 1914, p. 178, fig. 242; Tiffany 1926, p. 103, Pi. VIII, fig. 89; P. B. A. Nos. 72 and 716. Idioandrosporous; oogonium 1-8, globose-obovoid to globose, pore superior; oospore ellipsoid-globose, ovoid, angular-globose (rarely globose), nearly filling the oogonium, spore wall smooth, thick; andro- sporangium 1—4; dwarf male straight or slightly curved, on or near the suffultory cell; antheridium exterior, 1-2; vegetative cell 25-36 X 65—200y; oogonium 48-59X57—-90u; oospore 42-57 50-664; androsporangium 30-34 X 12-214; dwarf male stipe 14-16X60-70u; antheridium 8-10 X 10-18. United States: Massachusetts, Maine, Michigan, Penn- sylvania, New Jersey, Minnesota, Connecticut, South Dakota, Iowa, Ohio, New York, Illinois, Mississippi; England, Denmark, France, Germany, Sweden. This variety is one of the commonest of the nannandrous species of the genus. In fact, in comparison to it, the type seems rare. Characterized by the thick-walled oospore, globose- obovoid oogonia, and relatively long and straight vegetative cells. It differs from the species largely in its idioandrosporous habit. 142c. Var. cataractum (Wolle) Tiffany nov. comb. (Pl. XLIX, fig. 477.) Oe. cataractum Wolle 1887, p. 77, Pl. 85, figs. 10-12; zbid., Hirn 1900, p. 308, Pil. XLII, fig. 264; zhid., Collins 1909, p. 266. Oogonium 1-2, often terminal, obovoid-globose or subglobose or broadly ovate, pore superior; oospore globose or obovoid-globose, nearly filling oogonium; androsporangium 2-6; dwarf male curved, on suffultory cell or below; vegetative cell 28-38 X42-112u; oogonium 55-60 X60-75u; oospore 50-5550-60u; androsporangium 26-30X 10-15; dwarf male 10 65uy. United States: Pennsylvania, Ohio. From Wolle’s description this plant is certainly very close to Oe. crassiusculum, as suggested by Hirn (1900). Wolle’s ‘ OEDOGONIUM 131 figure does not help much and his confusing statements regard- ing an interior and a unicellular antheridium probably mean that he did not attach much significance to this character. The Ohio material with short vegetative cells seemed close to Oe. crassiusculum in other characteristics. I have therefore placed Wolle’s species as a variety of crassiusculum, with an emended description based on the Ohio specimens. 143. Oe. multisporum Wood. (Pl. XLVI, figs. 450 and 451.) 1869, p. 141; Androgynia multispora Wood 1872, p. 196, Pl. 17, fig. 3; Hirn 1900, p. 232, Pl. XXXIX, fig. 239; Collins 1909, p. 257; Fritsch and Rich 1913, p. 76, Age oA PB. A. No, 1784. Dioecious, nannandrous; oogonium 1-3, subovoid or subglobose, pore superior; oospore globose, nearly filling oogonium, spore wall smooth; dwarf male a little curved or nearly erect, near or on oogonium, antheridium exterior, 1-4; vegetative cell 10-15 10-30u; oogonium 24-35 X 27-334; oospore 27-380 24-30u; dwarf male stipe 10-11 26-30u; antheridium 7-9 X 7-9u. United States: Pennsylvania, Illinois; England. 148a. Var. magnum Ackley. (Pl. XLVI, fig. 452.) 1929, p. 305, Pl. XXXVI, figs. 20-22. Larger than the species; idioandrosporous; oogonium 1, subglobose, pore supramedian (rarely median); androsporangium 1-2; dwarf male on or near oogonium or scattered; vegetative cell 14-18 30—-90n; suffultory cell 17-21X28-90u; oogonium 40-43X33-38u; oospore 38-41 32-36; androsporangium 17-18 X16—22u; dwarf male stipe 12-14 (—20) X 24-26 (—29)u; antheridium 8-10 (—12) X8-10u. United States: Michigan (Muskegon Lake). It is sometimes difficult to decipher the pore in the species proper. The plant is usually irregularly formed with numerous and often scattered dwarf males and frequently gives the appearance of not being mature. The variety is larger. 144. Oc. irregulare Wittrock. (Pl. XLVI, fig. 447.) 1870, p. 128; 1874, p. 22; Hirn 1900, p. 202, Pl. XX XIII, fig. 207. Dioecious, nannandrous; oogonium 1, globose or rarely subdepressed- globose, pore superior; oospore globose, completing oogonium, spore wall smooth; dwarf male erect, on or near oogonium, antheridium exterior, 1-4; vegetative cell 15-20 40-80u; oogonium 37-45 X 3647p; oospore 36-42 3441y; dwarf male stipe 12-15 X 20-24y; antheridium 10-12 X6-8uy. United States: Illinois, Ohio, Florida, Michigan; British Columbia; Denmark, Sweden. 132 THE OFDOGCONTACEAE 144a. Var. condensatum (Hallas) Hirn. (Pl. XLVI, figs. 448 and 449.) 1906, p. 17, Pl. III, fig. 15; Oe. condensatum Hallas 1905, p. 400, fig. 4. Idioandrosporous; oogonium rarely in two’s; oospore depressed- globose; androsporangium 1-13; vegetative cell 14-18X20-80,; oogonium 35-46 28-38; oospore 32-44 25-36u; androsporangium 12-14X7-21yu; dwarf male stipe 11-13X21-24y; antheridium 9-10 7-12u. United States: Michigan; Denmark. The species is characterized by erect dwarf males, globose oospores, and smooth spore walls. It is larger than Oe. multi- sporum (No. 143) and there is little tendency toward a cluster of dwarf males. The var. condensatum has depressed-globose oospores and the dwarf males sometimes appear more or less in clusters. In superficial appearance there is considerable resemblance between Oe. multisporum var. magnum (No. 148a) and Oe. irregulare var. condensatum. 145. Oe. donneilii Wolle; Hirn. (Pl. XLV, fig. 437.) Wolle 1880, p. 48; Wolle 1887, p. 85, Pl. 84, figs. 3-6; Hirn 1900, p. 206, Pl. NOOO He aul Dioecious, nannandrous, idioandrosporous; oogonium 1 (rarely 2), obovoid-globose, pore superior; oospore globose, not filling oogonium, outer layer of spore wall echinate, spirals 5-7, anastomosate; andro- sporangium 4-10; dwarf male a little curved, on suffultory cell or rarely on oogonium, antheridium exterior, 1-2—?; vegetative cell 41-59x 54-175; oogonium 63-78 X 70-93; oospore (with spines) 60-70 X 60-70y; androsporangium 40-45 10-124; dwarf male stipe 16-21X63-74u; antheridium 14-15 x 8-22u. United States: Florida. 145a. Var. wittrockianum Hirn. (Pl. XLV, figs. 438 and 439.) 1909, p. 207, Pl. XXXIV, fig. 212; Oe. wittrockianum Hirn 1896 in Wittr., Nordst, and Lagerh. Alg. Exs. No. 1251. Smaller; spines a little smaller; vegetative cell (82—)35-45 X 70-135; oogonium 63-73 68-754; oospore (with spines) 55-6656-68y; androsporangium 30-38X 11-264; dwarf male stipe 11-15 50-65; antheridium 9-10 20-23. Brazil, Paraguay. The species is characterized by the echinate oospore wall, the spines being arranged spirally. The variety wittrockianum is very similar to the type, having slightly more slender fila- ments and smaller spines. OEDOGONIUM 133 146. Oe. armigerum Hirn. (Pl. XLII, fig. 415.) 1900, p. 203, Pl. XX XIII, fig. 208; (?) Oe. echinatum Wood tn Wolle 1887, p. 86, Pl. 85, figs. 13-16. Dioecious, nannandrous; oogonium 1, subglobose, pore superior; oospore globose, nearly filling oogonium, outer layer of spore wall echinate; dwarf male curved, on suffultory cell, stipe sometimes 2—4 celled; antheridium exterior, 1—?; vegetative cell 9-11 36—100n; oogonium 29-33 X32-35u; oospore 26-29 x 26-29; dwarf male, lower cell 7-8 X 20-24, upper cell 4-6 X 21-30y; antheridium 5-6 X7-8un. Brazil. Characterized by its echinate oospore wall with the spines not spirally arranged. It is smaller than either Oe. echinatum (No. 147) or Oe. lindmanianum (No. 148). 147. Oe. echinatum (Wood) Wittrock. (Pi. XLV, fig. 436.) Androgynia echinata Wood 1872, p. 198, Pl. 18, fig. 3; Oe. echinatum Wittr. 1878, p. 137; Hirn 1900, p. 204. | Dioecious, nannandrous; oogonium (?) 1, globose, usually depressed, pore superior; oospore globose, distending oogonium, outer layer of spore wall echinate; dwarf male suberect, near oogonium, (?) antheridium exterior, 1; vegetative cell 8-13X50-138y; oogonium 35-36 35-36; oospore (without echinations) 25-26 x 25-26u. United States: Pennsylvania. Wood’s figure of the echinate oospore is the only record of this species, other than the description above. 148. Oe. lindmanianum Wittrock. (PL. XLV, figs. 434 and 435.) In Wittr., Nordst., and Lagerh. Alg. Exs. No. 1216, 1896; Hirn 1900, p. 204, Pl. XXXIV, fig. 209. Dioecious, nannandrous, idioandrosporous; oogonium 1, obovoid- globose or subglobose, pore superior; oospore globose or subglobose, quite filling oogonium; outer spore wall echinate; androsporangium to 7-seriate; dwarf male a little curved, on suffultory cell, antheridium exterior, 1; vegetative cell 22-30 40-120u; oogonium 46-57 x 46-57; oospore (with spines) 45-56 X 45-54; androsporangium 22-28 & 17-27; dwarf male stipe 12-15 838—46u; antheridium 6-8 x 11-16n. Paraguay. Cf. Oe. armigerum (No. 146). 149. Oe. cyathigerum Wittrock. (Pl. LI, figs. 484 and 485.) 1870, p. 131, Pl. 1, figs. 6 and 7; Oe. cyathigerum Wittr. var. rumelica Istvanffi 1890, p. 77; Oe. ornatum Hirn 1896, p. 3, fig. (p. 4); Hirn 1900, p. 252, Pl. XLIII, figs. 265 and 266; Heering 1914, p. 184, fig. 256; Tiffany 1926, p. 103, Pl. IX, figs. 104 and 105. Dioecious, nannandrous, idioandrosporous; oogonium 1-3, subovoid or quadrangular-ellipsoid, pore superior; oospore same form as oogonium, 134 THE OE DOEGONLACG EAE filling it, outer layer of spore wall smooth, median layer with 16-25 longitudinal, continuous, rarely anastomosing, often curved, ridges— inner layer smooth; basal cell elongate; terminal cell, often an oogonium, obtuse; dwarf male goblet-shaped, curved, on the suffultory cell or oogonium; antheridium interior; vegetative cell 21-30*40-300y; suffultory cell 42-4875-110u; oogonium 57-66 70-100”; oospore 51-62 60-754; androsporangium 23-80X12-30u4; dwarf male cell 12-15 X 50-58n. United States: Iowa, Illinois, Ohio, Mississippi, Michigan; Denmark, France, Germany, Sweden, Rumania, Switzerland, England. 149a. Form americanum Wolle. 1887, p. 77, Pl. 81, figs. 20-22: Hirn 1900, p. 256. Smaller; dwarf male on oogonium; vegetative cell 17—21 X 22-62y; oogonium 45-50 55-63; oospore 39-40 X 4446y; dwarf male 12-15 50-54 yu. United States: Pennsylvania. 149b. Form ornatum (Wittrock) Hirn. (Pl. LI, figs. 488-490.) 1900, p. 254, Pl. XLIII, fig. 267; Oc. cyathigerum Wittr. var. ornatum Wittr. 1878, p. 134. Idioandrosporous; elongated dwarf males; vegetative cell 21-30 60—270u; suffultory cell 39-48 x60-116u; oogonium 56-65 x 69-102u; oospore 54-60 65-83u; androsporangium 21—27 X 138-27y; dwarf male 12-16 X60-75p. Mexico (Vera Cruz). 149c. Form perfectum Hirn. (Pl. LI, figs. 486 and 487.) 1900, p. 254; Pl. XLIII, fig. 268; Oe. cyathigerum Wittr. in Borge 1896, p. 5. Larger; androsporangium to 238-seriate; vegetative cell 22-35 65-350u; suffultory cell 37-56 56-140u; oogonium 65-81 72-111; oospore 61-78 X65-85y; androsporangium 21-30 15-30u; dwarf male 12-16 X 55-69. United States: Mississippi, Ohio; Brazil; Australia; India. 149d. Var. ellipticum Magnus and Wille. (Pl. LII, fig. 493.) In Wille 1884, p. 40, Pl. 2, fig. 67; Hirn 1900. p. 255, Pl. XLIV, fig. 271; Fritsch and Rich 1924, p. 320, fig. 4 A-C. Oospore frequently not filling oogonium, quadrangular-ellipsoid or nearly ellipsoid or rarely subglobose; vegetative cell 19-80 30—-120y; suffultory cell 26-4340-125u; oogonium 50-63X68—94y; oospore 48-57 X 45-664; dwarf male 15-18 X43-55y. United States: Ohio; Uruguay, Brazil; South Africa. OEDOGONIUM 135 149e. Var. hormosporum (West) Hirn. (Pl. LII, figs. 491 and 492.) 1900, p. 255, Pl. XLIV, figs. 269 and 270; Oe. hormosporum West 1897, p. 5. Oogonium and oospore smaller; oogonia 2-10 (rarely 1), andro- sporangium up to 15-seriate; vegetative cell 22-30 X 76-180y; suffultory cell 835-45 X 52-112y; oogonium 48-57 X 56-95y; oospore 46-55 & 53-65; androsporangium 18-22 12-24yu; dwarf male 9-13 47—54u. Africa. The species is readily identified among the nannandrous group by the irregular longitudinal ridges appearing on the median oospore wall. The suffultory cells are very much enlarged. The varieties and forms are separated largely on the basis of size. It differs from Oe. wolleanum (No. 150) in its smaller number of ribs. Fritsch and Rich (1924) record a form of Oe. cyathigerum with suffultory cell not always swollen and with frequently globose oospores. This is perhaps merely a slight variation of var. ellipticum. 150. Oe. wolleanum Wittrock. te (Pl. L, figs. 479 and 480.) 1878, p. 137; Wolle 1887, p. 82, Pl. 80, figs. 4 and 5; Oc. aphophysatum A. Br. in Rabenh. Alg. Sach. No. 291, 1853; Oe. concatenatum (Hass.) Kuetz. f. Juxurians Breb. in Roumeg. Alg. Exs. Nos. 683 and 1062; Hirn 1900, p. 220, Pl. XX XVII, fig. 226. Dioecious, nannandrous, gynandrosporous or idioandrosporous; oogonium 1-4, subobovoid or quadrangular-ellipsoid, pore superior, wall with raised longitudinal lines on the inner surface; oospore of same form as oogonium, quite filling it, outer layer of spore wall with 25-35 longitudinal ribs, rarely anastomosate, inner layer smooth; androsporangium 1-3, often subepigynous or scattered in the upper part of the filament; basal cell elongate; terminal cell, sometimes oogonium, short-acute or acuminate; dwarf male on suffultory cell, stipe slightly curved; antheridium exterior, 1-3; vegetative cell 21-30 65-235u; suffultory cell 45-5668-110u; oogonium 58-68 X69-89y; oospore 56-66 X65-83u; androsporangium 21-30 18-25u; dwarf male stipe 15-24 54-60u; antheridium 9-14X7-11p. United States: Massachusetts, Connecticut, New Jersey, Iowa, Pennsylvania, Minnesota, Florida, Illinois; Brazil; India; France, Latvia, Germany; Australia; Greenland. 150a. Var. concinnum Hirn. (Pl. L, fig. 481.) 1900, p. 222, Pl. XX XVII, fig. 228. Smaller; oospore not quite filling oogonium; ribs of outer layer of spore wall finely crenulate; vegetative cell 19-27 80—-180u; suffultory cell 41-52 X 72-150; oogonium 54-63 X 63-93u; oospore 52-61 X 62-74; dwarf male stipe 16-20 50—-50u; antheridium 10-13 10-15y. United States: Minnesota. 136 ive MOE DOGONITACEAE 150b. Form insigne (Nordstedt) Hirn. (Pl. L, figs. 482 and 483.) 1900, p. 222, Pl. XX XVII, fig. 227; Oe. wolleanum Wittr. var. insigne Nordst. in Wittr. and Nordst. Alg. Exs. No. 207, 1879. Stouter; ribs on the oogonium and oospore 35-40; oogonium 1-10; androsporangium to 10-seriate; antheridium 1-4; vegetative cell 18-36 x 53-250u; suffultory cell 57-66 100—-150u; oogonium 67-80 78-92; oospore 64-76 X74—90y; androsporangium 19-30 18-304; dwarf male stipe 18-24 54-68yu; antheridium 12-14 10-12uy. United States: New Jersey; Sweden. This species is characterized by regular, longitudinal ribs on the outer layer of the oospore wall. It differs from Oe. cyathigerum (No. 149) in this respect and also in having a larger number of ribs. Var. concinnum has crenulate ribs, and f. imsigne differs in its slightly larger size and in the larger number of ribs on the oospore. 151. Oe. concatenatum (Hassall) Wittrock. (Pl. LU, fig. 494.) Vesiculifera concatenata Hass. 1845, p. 201, Pl. 51,- fig. 3; Oe. cencatenatum Wittr. 1874, p. 25; Oe. apophysatum Al. Br. im Pringsh. 1858, p. 71, Pl. 5, fig. 9; Oe. apophysatum Pringsh. in Wittr. 1872a, p. 22; Oe. concatenatum (Hass.) Wittr. var. lagenarioides Filarszky 1899, p. 65, Pl. 3; Hirn 1900, p. 228, Pl. XX XVIII, fig. 230; Heering 1914, p. 180, fig. 245; Tiffany 1926, p. 104, Pl. VIII, fig. 92. Dioecious, nannandrous, gynandrosporous; oogonium 1-6, subovoid or quadrangular-ellipsoid, pore superior; oospore of same form as oogonium, nearly filling it, outer layer of spore wall smooth, middle layer with pits, more or less distinctly arranged in 30-35 longitudinal series, inner wall smooth; suffultory cell swollen; androsporangium 1-4; basal cell elongate; terminal cell obtuse; dwarf male curved, on’ suffultory cell; antheridium exterior, 1-4; vegetative cell 25-40 X 75-400, ; suffultory cell 50-6288-155u; oogonium 63-83 X76-105u; oospore 60-75 X 67-954; androsporangium 25-28 xX 15-364; dwarf male stipe 17-25 X 50-75u; antheridium 13-15 < 12-25u. United States: Illinois, Iowa, Massachusetts, New Jersey, Pennsylvania, New York, Michigan; Austria, England, Fin- land, Germany, Spain, Hungary, Sweden, Denmark; Alaska; British Columbia. 15la. Form hutchinsiz (Wittrock) Hirn. (Pl. LII, fig. 495.) 1900, p. 225, Pl. XXXVIII, fig. 231; Oe. hutchinsie Wittr. 1874, p. 42; Heering 1914, p. 180; Tiffany 1926, p. 104. Form a little smaller, oospore more nearly globose, the pits of the middle layer of spore wall not arranged in evident longitudinal series; vegetative cells 26-385X75-210u; suffultory cell 37-50X65-200p; oogonium 52-75 X67—-95u; oospore 50-73 X 55-77. United States: Iowa; England, France, Spain. GEDOCONTUM 137 151b. Var. rectangulare Rich. (Pl. LIII, figs. 496 and 497.) 1925, p. 72, fig. I. Oospore quadrangular-ellipsoid, membrane thick, middle layer of spore wall with its pits in transverse and longitudinal rows (about 15 transverse rows); idioandrosporous; vegetative cell 32-36 X75—400,; suffultory cell 5088—-155y; oogonium 5676-1054; oospore 48-56 x 67—95u; androsporangium 27 X 15—36uy. England. Oe. concatenatum is unique among the poriferous, nan- nandrous forms of the genus for its prominently pitted oospore. F. hutchinsie and var. rectangulare are separable largely on the arrangement of the pits on the median layer of the oospore. 152. Oe. huntii Wood. (Pl. XLVIII, figs. 465-468. ) 1869, p. 333; Wittrock 1878, p. 136; Androgynia huniti Wood 1872, p. 197, Pl. 17, fig. 2: Hirn 1900, p. 208, Pl. XXXIV, fig. 213; Collins 1908, p. 57; P. B. A. No. 1471. Dioecious, nannandrous; oogonium usually 1, subglobose or sub- obovoid-globose (rarely subhexagonal), pore inferior; oospore globose, not filling oogonium, outer spore wall with four raised spiral ribs; basal cell elongate; terminal cells tapering, setiferous (consisting of 10 or more superimposed long cylindrical cells, each smaller in diameter than the one below); dwarf male nearly straight, on suffultory cell, antheridium exterior, 1-2 (?); vegetative cell 15-25 xX 36-82u; oogonium 50-60 X52-60u; oospore 38-4238-42u; dwarf male stipe 1152u; antheridium 10 30u. United States: Massachusetts, Pennsylvania. Fruiting material showing the 4 spiral ribs has been seen only by Wood. Collins (1908) records the species showing the peculiar tapering setiferous terminal cells (see description above). This is the only species in the nannandrous group having ribbed oospores and an inferior pore. 153. Oc. hispidum Nordstedt. (PI. XLV, fig. 440.) In Wittr. 1870, p. 128, and 1874, p. 28; Hirn 1900, p. 210, Pi. XX XV, fig. 215. Dioecious, nannandrous, gynandrosporous; oogonium 1, terminal, subellipsoid or ellipsoid-globose, pore inferior; oospore globose to globose-ellipsoid, not filling oogonium or rarely enlarging it, outer spore wall echinate; androsporangia 2; terminal cell obtuse; dwarf male a little curved, on suffultory cell, antheridium exterior, 1; vegetative cell 9-14>“36-130u; oogonium 35-4442-56u; oospore (with spines) 32-39 X32-40u; androsporangium 10-126-8u; dwarf male stipe 7-8 X 17-18u; antheridium 5-6 < 7-9u. France, Sweden. 138 T EOF D-OGON LACE AE The only nannandrous species with echinate oospores and inferior position of the oogonial pore. 154. Oe. cleveanum Wittrock. (Pl. XLVI, figs. 443 and 444.) 1870, p. 128; 1872a, p. 22; 1874, p. 28; Oe. echinospermum Al. Br. in Pringsh. 1858, p. 70, Pl. 5, fig. 7; Oe. berolinense Wittr. 1872, p. 6; Oe. cleveanum Wittr. var. arvensis Istvanffi 1887, p. 242; Hirn 1900, p. 209, Pl. XX XV, fig. 214; Oe. cleveanum Wittr. f. exoticum Hirn 1900, p. 210 (not Hirn 1906, p. 33). Dioecious, nannandrous, gynandrosporous; oogonium 1, subobovoid- globose or subglobose, pore inferior; oospore globose, filling oogonium, outer layer of spore wall dentate, teeth in 4—6 spiral rows, anastomosate; suffultory cell sometimes tumid; androsporangium 1-7; dwarf male a little curved, on suffultory cell, antheridium exterior, 1; vegetative cell (14—) 18-25 40-110u; oogonium 45-60 48-63u; oospore (with teeth) 44-57 X 45-594; androsporangium 18-229-18u; dwarf male stipe 10-11 X 29-32u; antheridium 5-9 X 12-16n. England, France, Germany, Hungary, Sweden; Brazil. 154a. Form exoticum Hirn. 1906, p. 33, (not 1900, p. 210); Schmidle 1901, p. 344. Oogonium 1-3; vegetative cell 14-25 44—200u; oogonium 39-46 x 40-47; oospore (with teeth) 38-44 38—-44u; dwarf male stipe 10-11 27-30y; antheridium 6-7 X 11-13. Caroline Islands. Oe. cleveanum is characterized by the inferior position of the oogonial pore and the dentate oospore, the teeth being arranged somewhat spirally. The form exoticum as described by Hirn (1900) is so nearly identical with the species as to be untenable even as a form. The specimens from the Caroline Islands referred to f. exoticum by Schmidle (1901) and Hirn (1906) have distinctly smaller oogonia and oospores and are thus perfectly tenable. 155. Oc. elegans West and West. (Pl. LIT, figs. 498 and 499.) 19025 pe 12S RIPE tess O=/-kliten! L906. ps loads Via tien 22. Dioecious, nannandrous; oogonium 1, depressed-globose, operculate, division median; oospore depressed-globose, quite filling oogonium, spore wall smooth; dwarf male small, unicellular, on oogonium; vegeta- tive cell densely and minutely granulate, the deposits spirally arranged; vegetative cell 6-9 X 25-85yu; oogonium 27-31 X 25-26u; oospore 25-28 X 18-19u; dwarf male 5-6 * 8—9u. ° Ceylon. The only nannandrous member of the genus with granulate vegetative cells. Cf. Oe. minus (No. 84). OEDOGONIUM 139 156. Oe. rigidium Hirn. (Pl. LIII, figs. 506 and 507.) 1900, p. 237, Pl. XL, fig. 244. Dioecious, nannandrous, gynandrosporous; oogonium 1, obovoid- globose, operculate, division superior; oospore globose, nearly filling oogonium, spore wall smooth, often thick; androsporangium 1-2, epigynous, subepigynous or hypogynous; vegetative cell broadly capitellate; terminal cell obtuse; dwarf male curved, on oogonium, antheridium exterior, 1—?; vegetative cell 12-14388—58yu; oogonium 35-39 (42) X38—45u; oospore (380—-) 34-38 34-38; androsporangium 10-11 X 11—12u; dwarf male stipe 7-9 x 18—22u; antheridium 5-7 X 6-7. Brazil; South Africa. The only nannandrous species having the combination of superior position of the oogonial operculum, and capitellate vegetative cells. 157. Oe. bengalense Hirn. (Pl. LITT, figs. 504 and 505.) 1900, p. 268, Pl. XLVI, fig. 287. Dioecious, nannandrous, idioandrosporous; oogonium 1-4, sub- depressed-globose to ovoid, operculate, division median, rather wide; oospore subdepressed-globose or globose; quite filling oogonium, spore wall smooth; androsporangium 1-4; vegetative cell capitellate; basal cell elongate; terminal cell, not rarely the oogonium, apically obtuse; dwarf male obovoid, unicellular, on oogonium; vegetative cell 14-19 45-110u; oogonium 46-5444-54u; oospore 48-48X43-48y; andro- sporangium 14-15 13-18u; dwarf male 12-13X 16-18n. India: Bengal. Cf. Oe. indicum, below. 158. Oe. indicum Hirn. (PI. LIV, fig. 509.) 1900, p. 269, Pl. XLVI, fig. 288. Dioecious, nannandrous, gynandrosporous; oogonium 1—2, depressed- globose or depressed obovoid-globose, operculate, division median, narrow but distinct; oospore depressed-globose, completing oogonium, spore wall smooth; androsporangium 1—2—?, subepigynous; vegetative cell broadly capitellate; basal cell elongate; dwarf male obovoid, un1- cellular, on oogonium; vegetative cell 20-2550-110u; oogonium 57-64 X48-53u; oospore 55-6143-50u; androsporangium 19-20 8-10u; dwarf male 11-14 18n. India. This species together with Oe. bengalense above combine the characters of capitellate vegetative cells and median position of a narrow operculum. Oe. indicum is the larger of the two. Cf. Oe. areschougii (No. 160), Oe. brasiliense (No. 159), and Oe. confertum (No. 161). 140 THE (OE D'OEOMIAC EWE 159. Oc. brasiliense Borge. (Pl. LIV, fig. 508.) 1899, p. 4, Pl. 1, fig. 1; Hirn 1900, p. 272, Pl. XLVI, fig. 292. Dioecious, nannandrous, idioandrosporous; oogonium 1-3, sub- depressed-globose or subpyriform-globose, operculate, division median, broad; oospore subdepressed-globose, not quite filling oogonium, spore wall smooth; androsporangium to 5-seriate; vegetative cell capitellate; dwarf male obovoid, unicellular, on oogonium; vegetative cell 16-22 35-95u; oogonium 53-63X52-59u; oospore 48-5345-50u; andro- sporangium 15-16 X 11—14y; dwarf male 10-12 14-19. Brazil. Characterized by its broad Ope and capitellate vegetative cells. : 160. Oe. areschougii Wittrock. (Pl. LIM, fig. 500.) 1870, p. 122. Pl. 1, figs. 1 and 2; 1874, p. 19, Pl. 1, figs. 10 and 11; Hirn 1900, p- 270; PEDSGLVLS fig. 289° Dioecious, nannandrous, gynandrosporous; oogonium 1-6, sub- depressed- or depressed pyriform-globose, operculate, division median, broad; oospore globose, rarely subdepressed-globose, not completing, oogonium longitudinally, spore wall smooth; androsporangium 1-6, subepigynous or hypogynous or rarely scattered: vegetative cell capi- tellate; basal cell elongate; terminal cell, usually the oogonium, apically obtuse; dwarf male obovoid, unicellular, on oogonium; vegetative cell 8-13 X 35-754; oogontum 34-389X36-40u; oospore 22-26X22-25y; | androsporangium 9-11 10—-12u; antheridium 6-7 X 13-15uy. United States: New Jersey; Brazil; Finland, Germany, Sweden, Denmark; Greenland; Siberia. 160a. Var. americanum Tiffany. (Pl. LII, fig. 501.) 1927, p. 205, Pl. IX, figs. 8 and 9. Idioandrosporous; oogonium smaller; androsporangium to 11- seriate; vegetative cell 8-1240-80u; oogonium 29-36 26—-40y; oospore 23-26 X 22-26u; androsporangium 7-9 X7-11p. United States: Illinois. 160b. Form robustum Hirn. (Pl. LITI, figs. 502 and 503.) 1900, p. 271, Pl. XLVI, fig. 290; (?) Oe. obtruncatum var. oblatum Tilden, Amer. Alge No. 3, 1894; Oe. areschougu {. major Collins 1912, p. 88. Idioandrosporous; oospore larger; oogonium to 8-seriate; vegetative cell 12-17 X 36-120u; oogonium 36-40 X 36—-53y,;.0ospore 30-32 X 27-31; androsporangium 9-12 10-13; dwarf male 6-8 X 14—-15y. England; (?) Minnesota (U. S.). OEDOGONIUM 141 This species is characterized by its capitellate vegetative cells, wide operculum, small size, and small oospores in com- parison with oogonia. Var. americanum differs from the species in being idioandrosporous; f. rebustum in addition has larger oospores. 161. Oe. confertum Hirn. (Pl. LIV, fig. 510.) 1900, p. 272, Pl. XLVI, fig. 291. Dioecious, nannandrous, (?) idioandrosporous; oogonium 1-4, depressed-globose or depressed pyriform, operculate, division median, wide; oospore globose or subdepressed-globose, not filling oogonium longitudinally, spore wall smooth; vegetative cell capitellate; dwarf male obovoid, on oogonium; vegetative cell 19-26 x 66-105u; oogonium 56-63 X 44-56u; oospore 42-48 X 40-44; dwarf male 10-12 13-16n. Australia. To be compared with Oe. areschougit (No. 160), which is smaller and has less depressed oogonia. It is also similar in appearance to the larger Oe. perspicuum, below. 162. Oe. perspicuum Hirn. (Pl. LIV, fig. 511.) 1900, p. 273, Pl. XLVI, fig. 293; Oe. diotcum Carter in West and West 1901, p. 175, Pl. IV, fig. 42. Dioecious, nannandrous; oogonium 1-8, depressed or subdepressed- globose, operculate, division median, broad; oospore globose or sub- globose, not filling oogonium longitudinally, spore wall smooth; dwarf male obovoid, unicellular, on oogonium; vegetative cell (80—) 35-43 95-175u; oogonium 89-100 64-104y; oospore 55-70 52-70u; dwarf male 15-18 X 19—22n. Australia; Siam. Cf. Oe. confertum, above. 163. Oc. clavatum Hallas. (Pl. LIV, figs. 512 and 513.) 1905, p. 399, fig. 3; Hirn 1906, p. 11, Pl. IV, fig. 28. Dioecious, nannandrous, gynandrosporous; oogonium 1-3, sub- pyriform to subdepressed-globose, operculate, division a little above medium; oospore subdepressed, depressed-globose, or globose, quite filling oogonium (rarely not), spore wall smooth; androsporangium 1-2, scattered; dwarf male obovoid, unicellular, on oogonium; vegetative cell capitellate or nearly clavate; basal cell subhemispherical; vegetative cell 2-9X5-80u; oogonium 14-26 16-2lu; oospore 12-21X12-14u; androsporangium 4—6X5-7y; dwarf male 6X 14—-15y. United States: New York (Long Island); Denmark. One of the smallest nannandrous species with capitellate or nearly clavate vegetative cells. 142 a rE -OXE DOG ONT ACE ACE 164. Oe. oelandicum Wittrock; Hirn. (Pl. LVI, fig. 539.) Wittrock 1874, p. 17; Hirn 1900, p. 273, Pl. XLVII, fig. 297. Dioecious, nannandrous, gynandrosporous; oozonium 1-7, depressed- globose, with 12-16 longitudinal ridges, operculate, division supra- median, rather broad; oospore depressed-globose, nearly filling oogonium, spore wall smooth; androsporangium to 6-seriate; vegetative cell capitellate; terminal cell apically obtuse; dwarf male obovoid, uni- cellular, on oogonium; vegetative cell 10-15%25-125u; oogonium 31-40 25-324; oospore 25-36 23-30u; androsporangium 7-12 10-184; dwarf male 7-8 X 12-15u. United States: Michigan; British Columbia; Sweden. 164a. Form minus Borge. (Pl. LVI, fig. 540.) LORE pe 20a, ble 2) feel: Smaller; vegetative cell 9-1036-50u; oogonium 27-30 X 19-25n; dwarf male 6-7 X 11-12u. The species is characterized by its longitudinally ridged oogonia, supramedian operculum, and capitellate vegetative cells. It is smaller than the similarly appearing, larger Oe. megaporum, below. F. minus has shorter oogonia. 165. Oe. megaporum Wittrock. (Pl. LVI, fig. 543.) 1872, p. 3, Pl. 1, figs. 6 and 6; Hirn 1900, p. 274, Pl. XLVII, figs. 298 and 299; Oe. oelandicum Wittr. var. subpyriforme Wittr. i Wittr., Nordst., and Lagerh. Alg. Exs. No. 1218, 1896. Dioecious, nannandrous, idioandrosporous; oogonium 1-6, broadly pyriform, with 12-16 rounded longitudinal ridges, operculate, division supramedian and wide; oospore subdepressed-globose, not filling oogonium, spore wall smooth; androsporangium to 4-seriate; vegetative cell capitellate, basal cell elongate; terminal cell apically obtuse; dwarf male unicellular, broadly obovoid, on oogonium; vegetative cell 13-17 X 40-100u; oogonium 37-4240-45u; oospore 31-35 (-38)X27-30y; androsporangium 10-11 12—22u; dwarf male 8-12X 13-16n. ; United States: Michigan; Finland, Germany, Sweden. Cf. Oe. oelandicum (No. 164). 166. Oe. bahusiense Nordstedt. (Pl. LV, figs. 530 and 531.) 1877, p. 26, Pl. 3, figs. 7-11; Hirn 1900, p. 279, Pl. XLVIII, fig. 307. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), depressed pyriform, with 9-12 longitudinal ridges appearing as a median whorl, operculate, division inframedian; oospore depressed-obovoid or depressed-globose, nearly filling oogonium, spore wall smooth; andro- sporangium to -+-seriate, scattered, often terminal; vegetative cell OEDOGONIUM 143 capitellate; dwarf male unicellular, obovoid, small, on oogonium; vegetative cell 12-15X25-60u; oogonium 30-36 22-291; oospore 23-28 X 20-24u; androsporangium 10--13X5-7y; dwarf male 5-6 8-9u. Sweden. This species combines the inframedian position of the operculum, ridged oogonium, capitellate vegetative cell, and non-tumid suffultory cell. It differs from Oe. platygynum, below, in its larger dimensions. 167. Oe. platygynum Wittrock. (Pt. LVI, fig. 544.) 1872, p. 1; 1874, p. 17, Pl. 1, figs. 5-9; Oe. platygynum Wittr. f: major West 1891, p. 109, Pl. 18, fig. 1; Hirn 1900, p. 276, Pl. XLVII, figs. 301 and 302; P. B. A. No. 1677. Dioecious, nannandrous, gynandrosporous and idioandrosporous; oogonium 1-2, depressed obovoid, with 7-12 (more often 8) rounded projections arranged in a whorl around the middle, operculate, division inframedian; oospore depressed- or subdepressed-globose, not quite filling oogonium,-spore wail smooth; suffultory cell sometimes tumid; androsporangium 1-3; vegetative cell evidently capitellate; terminal cell apically obtuse; dwarf male unicellular, obovoid, small, on oogonium; vegetative cell 5-11X14-50u; oogonium 21-30 16-24u; oospore 17-24 13-204; androsporangium 6-8 X7-8yu; dwarf male 4-5 X<8-10u. United States: New Jersey, Pennsylvania, Florida, Minne- sota; Brazil; England, Denmark, Finland, Germany, Ireland, Norway, Latvia, Sweden; Africa; Ceylon. 167a. Form obtusum Hirn. (Pl. LVI, fig. 545.) 1900. p. 277, Pl. XLVII, fig. 303. Idioandrosporous, oogonium a little less depressed, processes obtusely rounded; vegetative cell 6-10X14-50u; oogonium 22-26 18-24y; oospore 17-19 14-15yu; androsporangium 6-8X8-10u; dwarf male 4—5 X7-9p. England, Sweden. 167b. Var. continuum Nordstedt. (Pl. LVI, fig. 546.) 1888, p. 12, Pl. 1, figs. 16 and 17; Hirn 1900, p. 278, Pl. XLVII, fig. 305. Oogonium to. 5-seriate, projections more truncately rounded; suffultory cell enlarged; vegetative cell 848u; suffultory cell 12-14x 25-40; oogonium 28-32 X 21-26yu; oospore 22 20y; ? androsporangium 15-17 X 12h. New Zealand. 144 THE QEDOGONTACEAE 167c. Var. nove zelandiz Hirn. (Pl. LVI, fig. 547.) 1900, p. 278, Pl. XLVII, fig. 304; Oe. platygynum Wittr. forma Nordst. 1888, p. 12, Pl. 1, figs. 14 and 15. Gynandrosporous; oogonium subpyriform, projections obtuse or truncately rounded; vegetative cells very broadly capitellate, 6-9 20-504; oogonium 24-28 X22-26u; oospore 20-22 18-204; andro- sporangium 7-8 X7-11p. New Zealand. Cf. Oe. bahusiense (No. 166). 168. Oe. longicolle Nordstedt. (Pl. LV, figs. 516 and 517.) 1878, p: 20; Pl. 2, figs. 11 and 12; Hirn 1900,-p. 263; Pl. XLV, fie278: Dioecious, nannandrous; oogonium 1-7, pyriform, often elongated longitudinally, operculate, division median and narrow; oospore sub- depressed-globose or subglobose, inflating oogonium medianly, not filling it longitudinally, spore wall smooth; basal cell subhemispherical; dwarf male unicellular, obovoid, minute, on oogonium; vegetative cell 4-6 X 16-45; oogonium 13-16 16-324; oospore 12-15 X 10—-16y; dwarf male 24u; basal cell 14 6. Australia; Ceylon. 168a. Var. senegalense Nordstedt. (Pl. LV, figs. 518 and 519.) 1880, p. 18, Pl. 1, fig. 23; (2) Oe. delicatulum Kuetz. in Wolle 1887, P1. 81, figs. 12 and 13; Hirn 1900, p. 264, Pl. XLV, figs. 279 and 280. O6¢. longicolle Nordst. var. senegalense Nordst. f. afghanicum Schaarsch. 1884, p. 249, Pl. 5, fig. 26, and in Hirn 1900, p. 264, Pl. XLV, fig. 281. Larger; vegetative cell 5-8X1240u; oogonium 16-20X 14-24; oospore 14-20 11-17; basal cell 13-14 X 5-7. Africa; Brazil; Ceylon; Australia; Afghanistan; Burma. The species is characterized by its small size, subhemi- spherical basal cell, nannandrous habit, and smooth oogonium. It is the smallest of similar species that follow: Oe. rothii (No. 169) and Oe. decipiens (No. 171). 169. Oc. rothii (Le Clerc) Pringsheim. (Pl. LV, fig. 526.) (?) Prolifera rothii Le Clerc 1817, p. 476, Pl. 23, fig. 8; Oe. rothi Pringsh. 1858, p. 69, Pl. 5, fig. 4; Oe. cryptoporum Wittr. var. vulgare Wittr. f. abbreviata Gutw. 1897, p. 126; Oe. cryploporum Wittr. var. subdepressum Wittr. in Wittr. and Nordst. Alg. Exs. No. 152, 1878; Hirn 1900, p. 265, Pl. XLV, fig. 282; Collins, 1909, p. 262; P. B. A. No. 520. Dioecious, nannandrous, gynandrosporous; oogonium 1-3, sub- depressed-globose, operculate, division median, narrow; oospore de- pressed-globose, almost filling oogonium, spore wall.smooth; andro- sporangium 1-4; subhypogynous, hypogynous, subepigynous, or scat- tered; vegetative cell 6-10 X 20-76u; oogonium 20-27 X 16—-27u; oospore 17-25 X 14-20u; androsporangium 6-8 X5-10u; dwarf male 4X 11-12uy. OEDOGONIUM 145 United States: Massachusetts; Austria, Denmark, England, Germany, Norway, Sweden. Cf. Oe. longicolle, above. 170. Oe. danicum Hallas. (Pl. LIV, fig. 515.) 1905, p. 404, fig. 10; Hirn 1906, p. 12, Pl. IV, fig. 24. Dioecious, nannandrous, gynandrosporous; oogonium 1, pyriform or pyriform-globose, operculate, division supramedian; oospore globose or depressed-globose, filling oogonium or not, spore wall smooth; androsporangium 1-3, hypogynous or scattered; dwarf male obovoid, unicellular, on suffultory cell or scattered; vegetative cell 4-7 K 20-82u; oogonium 21-23 X23-35u; oospore 19-20 15-204; androsporangium 4-7 X7-12u; dwarf male 6-7 X 14-16u. Denmark. 171. Oe. decipiens Wittrock. (Pl. LV, fig. 520.) 1870, p. 126; Oe. vesicatum Link in De Bary 1856, p. 224, Pl. 5; Oe. rothii (Le Cl.) Pringsh. f. major West and West 1897, p. 5; Hirn 1900, p. 266, Pl. XLVI, figs. 283 and 284; Collins 1909, p. 262; Heering 1914, p. 188, fig. 258; Tiffany 1926, p. 104, PI Vinb tie. 88: Dioecious, nannandrous, gynandrosporous; oogonium 1-3, sub- depressed globose, operculate, division median, rather narrow; oospore subdepressed or depressed-globose, almost filling the oogonium, spore wall smooth; suffultory cell not swollen; androsporangium 1-6, sub- epigynous, hypogynous, or scattered; dwarf male unicellular, usually on the oogonium; vegetative cell i 12 28-80u; oogonium 30-38 27—40u; oospore 25- 34K 23- —28u; androsporangium 9— 10x8- 154; dwarf male 6-7 X 13-15y. United States: Michigan, Iowa, New Jersey; France, Ger- many, Sweden, England; Africa. 171a. Form dissimile Hirn. (Pl. LV, figs. 521 and 522.) 1900, p. 267, Pl. XLVI, fig. 285. Gynandrosporous; vegetative cells evidently capitellate, 8-11x 25-65; oogonium 28-35 X 23-38u; oospore 23-34 X 21-30u; androspor- angium 8-9 X6—-10u; dwarf male 5-6 X 11-14uy. United States: Michigan; Brazil. 171b. Var. africanum Tiffany. (Pl. LV, figs. 623 and 524.) 1929, p. 74; Oe. decipiens Wittr. forma im West and West 1897, p. 5, and im Hirn 1900, p. 267, Pl. XLVI, fig. 284. Smaller and idioandrosporous; vegetative cell 8-13 25-60y; oogonium 25-32 24-32u; oospore 24-30 23-28u; androsporangium 7-11X9-13u; dwarf male 6-7 X9-12u. Africa. 146 THE OF DO CONTA CEAE 171c. Var. bernardense (Bates) Hirn. (Pl. LV, fig. 525.) 1900, p. 268, Pl. XLVI, fig. 286; Oe. bernardense Bates 1886, p. 313; Oe. londi- nense Wittr. var. compressum West 1891, p. 110, Pl. 18, figs. 10-12. Smaller; gynandrosporous; androsporangium to 8-seriate; vegetative cell 8-12 18—-45u; oogonium 25-31 21-32u; oospore 21-29 x 17—24y; androsporangium 7-11 5-11; dwarf male 6-7 X 10-12u. England, Spain. The tendency of the decipiens group toward capitellate cells reaches a maximum in f. dissimile. The others are either not noticeably or only somewhat capitellate. The small size, nannandrous habit, and median operculum are also character- istic. F. africanum is idioandrosporous, while f. bernardense 1s gynandrosporous. 172. Oe. macrospermum West and West. (Pl. LV, figs. 527 and 528.) 1897, p. 472, Pl. 7, figs. 6 and 7; Hirn 1900, p. 227, Pi. XX XVIII, fig. 232; Oe. macrospermum West and West f. patagonicum Borge and Hirn in Borge 1901, p. 9, Pl. 1, fig. 1, and im Hirn 1906, p. 18, Pl. III, fig. 18; Tiffany 1926, p. 105, PI. Vir, figs. 93 and 94. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), subdepressed to depressed-globose, operculate, division median, narrow; oospore subdepressed-globose, filling the oogonium, spore wall smooth; dwarf male slightly curved or straight, not infrequently at right angles to the filament, on suffultory cell or on oogonium or scattered; anther- idium exterior, 1-4; basal cell elongate; androsporangium 1—?; vege- tative cell 10-16 30-80y; oogonium 39-46 3444u; oospore 36-44 32-42u; dwarf male stipe 9-1416-30u; androsporangium 14-15 xX 10-11; antheridium 7-10 6—-16y. United States: Iowa, Michigan, Ohio; England, Latvia; Patagonia. The above description as emended by Tiffany (1926) from material collected in Iowa includes f. patagonicum Borge and Hirn (Borge 1901). The species is characterized by its par- ticularly straight vegetative cells, narrow median operculum, and dwarf males scattered and often at right angles to the filament. 173. Oe. costatum Transeau nov. sp. (PI. LVI, fig. 548.) Dioecious, nannandrous, gynandrosporous; oogonium 1, depressed globose, with verticillate folds forming distinct pointed projections at the suture, operculate, division narrow, supramedian; oospore depressed- globose, filling oogonium, spore wall smooth; androsporangium hypo- gynous; vegetative cell usually capitellate; terminal cell with rounded apex; vegetative cells 12-15X50-70u; oogonium 50-55 40-44; oospore 48-53 X36-42u; androsporangium 12-13X10-12u. OEDOGONIUM 147 United States: New York (Smithtown Pond and Fish _Hatchery Pond, Long Island). Distinguished by its depressed-globose oogonia with verti- cillate folds forming pointed projections at the suture. It is larger than Oe. boreale below and is further distinguished by the shape and form of the oogonium. 174. Oe. boreale Hirn. (Pl. LVI, fig. 542.) 1900, p. 275, Pl. XLVIT, fig. 300. Dioecious, nannandrous; oogonium 1 (rarely 2), pyriform, wall thick and lamellose, medianly plicate, 16-19 verticillate folds, opercu- late, division supramedian; oospore subglobose (or subpyriform-globose), inflating oogonium, spore wall smooth; vegetative cell capitellate; dwarf male broadly obovoid, unicellular, on oogonium; vegetative cell 18-22 55-150; oogonium 58-65 X 67—78u; oospore 48-53 & 48-53u; dwarf male 14-16 < 15-20u. Finland. Cf. Oe. costatum, above. 175. Oe. mirandrium Skuja. > (Pl. LIV, fig. 514.) 1927, p. 101, Pl. II, figs. 12 and 12a. Dioecious, nannandrous, (?) idioandrosporous; oogonium | (rarely 2), subpyriform globose, operculate, division supramedian, or nearly superior; oospore globose, quite or not filling oogonium, spore wall smooth; dwarf male unicellular, ovoid, on oogonium; terminal cell obtuse; basal cell elongate; vegetative cell 13-20 28—-90u; suffultory cell 14-24 35-90; oogonium 40-48 x 38-43; oospore 35-42 « 35-42; dwarf male 9-26 x 11-35u. Latvia. Characterized by the supramedian operculum, unicellular dwarf male, and smaller suffultory cell. It bears some resem- blance to the macrandrous Oe. pringsheimii (No. 95.) 176. Oe. contortum Hallas. (Pl. XLVIII, fig. 464. ) 1905, p. 399, fig. 2; Hirn 1906, p. 11, Pl. IV, fig. 25. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), depressed-globose (rarely pyriform), operculate, division inframedian; oospore depressed (rarely globose), quite filling oogonium, spore wall smooth; androsporangium 1—5, curved, hypogynous or rarely epigynous or scattered; dwarf male obovoid, unicellular, on oogonium; vegetative cell 5-7 X20-60u; oogonium 23-35 xX 16-35u; oospore 16-28 x 12-21y; androsporangium 5-7 X7—-14y; dwarf male 4X 13u. Denmark. 148 REE “OE DIO'GON LACE AS The twisted appearance of the filaments, the inframedian operculum, and the non-filled oogonia are characteristic. It should be remarked that Hallas’ original figure which Hirn copies gives every evidence of an inframedian “‘pore.’’ The description however indicates an operculate oogonium. The curved filaments are similar to those of the monoecious Oe. curvum (No. 2). It should be compared with Oe. platygynum (Nosi67): 177. Oe. schmidlei Gutwinski. (Pl. LVII, fig. 572.) 1896, p. 2, Pl. 1, fig. 2; Hirn 1900, p. 228, Pl. XX XVIII, fig. 234. Dioecious, nannandrous; oogonium 1, obovoid-globose, operculate, division superior (? narrow); oospore globose, not filling oogonium, spore wall pitted, rather thick; dwarf male a little curved, on suffultory cell, antheridium exterior, 1?; vegetative cell 10*25-90u; suffultory cell 22 44u; oogonium 2932-37; oospore 26 X 26u; dwarf male stipe 5X 27u; antheridium 5-6 X5-6uy. Austria; British Columbia. Gutwinski’s figure leaves room for doubt as to the exact nature of the oospore wall. Hirn (1900) regards it as ‘‘mem- brana porifera’’ which I have interpreted as pitted. The record from British Columbia by Mr. G. H. Wailes gave no added data. In general appearance it resembles the larger and smooth spored Oe. hians (No. 180). 178. Oe. longatum Kuetzing. (Pl. LVIILI, fig. 563.) . 1853, p. 11, Pl. 33, fig. 6; Wittr. 1874, p. 38; Nordst. 1877, p. 28; Oe. crispulum Wittr. and Nordst. im Wittr. 1872, p. 5; Hirn 1900, p. 239, Pl. XL, fig. 248; Heering 1914, p. 182, fig. 249; Tiffany 1926, p. 105, Pl. IX, fig. 106; P. B. A. No. 82. Dioecious, nannandrous; oogonium 1-8, ovoid to ellipsoid, opercu- — late, division superior; oospore ellipsoid about filling the oogonium, spore wall usually smooth, basal cell elongate; terminal cell obtuse; dwarf male on the oogonium; antheridium exterior, 1—?, curved; vege- tative cells 4-7 10-35u; oogonium 16-18 X 21—25yu; oospore 15-17 17-19; dwarf male stipe 5-6 X 10-15y; antheridium 4-5 X 5-6u. United States: Iowa, Massachusetts, Pennsylvania; Austria, England, Finland, Germany, Sweden; British Columbia. Cf. Oe. rugulosum, below. — 179. Oe. rugulosum Nordstedt. (Pl. LVIII, fig. 560.) 1877, p. 28, Pl. 3, figs. 12 and 13; Oe. sp. Borge 1896, p. 5, Pl. 1, fig. 4; Hirn 1900, p. 241, Pl. XL, figs. 249 and 250; Heering 1914, p. 182, fig. 250; Transeau 1917, p. 231; Tiffany 1926, p. 105, Pl. IX, fig. 96. Dioecious, nannandrous; oogonium 1—2, obovoid or obovoid-ellipsoid, operculate, division superior; oospore ellipsoid, nearly filling oogonium OEDOGONIUM 149 (or rarely globose-ellipsoid, not filling oogonium) spore wall sometimes crenulate; dwarf male on or near oogonium; antheridium exterior, 1—?, curved; vegetative cell 4-8X10-35u; oogonium 16-20 X 22-29n; oospore 15-18X19-23u; antheridium 4-5X5-6u; dwarf male 5-7X 11—-14u. United States: Iowa, Michigan, New York; Denmark, France, Sweden; Australia. 179a. Form minutum (Hansgirg) Hirn. (Pl. LVIII, fig. 561.) 1900, p. 242, Pl. XL, fig. 251; Oe. crispulum Wittr. and Nordst. var. minutum Hansg. 1886, p. 44. Smaller; median spore wall distinctly crenulate (Transeau); vege- tative cell 3-7X12—-40u; oogonium 14-18X18—-24y; oospore 13-17 15-20u. United States: Illinois; Austria. 179b. Form rotundatum Hirn. (Pl. LVII, fig. 562.) 1900, p. 242, Pl. XL, fig. 252. Oogonium a little larger and shorter; oospore globose-ellipsoid; vegetative cell 5-8 X 15-31y; oogonium 19-23 K 20-26; oospore 18-22 18—23u; dwarf male stipe 5-6 11—l5yu; antheridium 4-6 X4—6uy. Germany. This species is near Oe. longatum (No. 178) and is separable largely on the basis of the form of the oogonium and relative length of the oospore. Sometimes the oospore wall of Oe. rugulosum is crenulate. The latter is characteristic of f. minutum, which is smaller and has more obovoid oogonia. F. rotundatum has globose-ellipsoid oospores and slightly larger oogonia. 3 180. Oe. hians Nordstedt and Hirn. (Pl. LVIII, figs. 570 and 571.) In Hirn 1900, p. 227, Pl. XX XVIII, fig. 238. Dioecious, nannandrous, gynandrosporous; oogonium 1-2, subovoid or globose, operculate, division superior, wide; oospore globose,_ quite filling oogonium, spore wall smooth, thick, and often lamellose; suffultory cell tumid; androsporangium 1—2, subepigynous; basal cell elongate; terminal cell apically obtuse; dwarf male curved, on suffultory cell, antheridium exterior, unicellular; vegetative cell 9-15 X37—145u; sufful- tory cell 26-3340-80u; oogonium 37-43 45-60u; oospore 33-40 33-40u; androsporangium 11-12X15-18u; dwarf male stipe 7-9X 32-35u; antheridium 6-8 X 5-6u. United States: Iowa; Brazil. Characterized by its swollen suffultory cells, wide operculum, and tendency toward capitellate vegetative cells. 150 THE OfbDOGONDACE AE 181. Oe. hoersholmiense Hallas. (Pl. LVII, fig. 559.) 1905, p. 400, fig. 5; Hirn 1906, p. 15, Pl. IV, fig. 21. Dioecious, nannandrous, gynandrosporous; oogonium 1 (rarely 2), ellipsoid, operculate, division superior; oospore ellipsoid or globose, not filling oogonium, spore wall smooth; androsporangium 1-5, often hypogynous or scattered; basal cell elongate; terminal cell obtuse; dwarf male curved, on oogonium, antheridium exterior, 1-2; vegetative cell 7-12 44-160u; oogonium 30-36 X 56-68; oospore 26-32 X 32-45y; androsporangium 7—-12X16-2lu; dwarf male stipe 9-12*30-35y; antheridium 7—8 X 10—l1yu; basal cell 3-14 x 16-50p. Denmark. This species is perhaps near Oe. ciliatum (No. 185) from which it differs in its smaller size, longer vegetative cell, and obtuse terminal cell. The figure of Hallas would seem to indicate an operculum in a supreme position, although the description records ‘‘superior.’’ I have included it in both positions in the key. 182. Oe. laetevirens Wittrock. (Pl. LVI, fig. 558.) In Zeller 1876, p. 427; Hirn 1900, p. 239, Pl. XL, fig. 247. Dioecious, nannandrous; oogonium | (rarely 2), subobovoid-globose, operculate, division superior; oospore globose or subdepressed-globose, filling oogonium or enlarging it, spore wall smooth; dwarf male on oogonium, stipe a little curved, antheridium exterior, 1—?; vegetative cell 12-13 X 18-32u; oogonium 30-34 X 32-36; oospore 28-32 XK 27-29; dwarf male stipe 7-8 x 20-21y; antheridium 6X 5-7y. Brazil. Cf. Oe. macrandrium (No. 184). 183. Oe. pluviale Nordstedt. (Pl. XL, figs. 392 and 393.) In Rabenh. Alg. Eur. No. 2257, 1871; Wittr. 1872, p. 7; Oe. intermedium Kuetz. in Rabenh. Alg. Sachs. No. 828, 1859; Oe. montagnei Fior.-Mazz. var. submarinum Wittr. im Wictr. and Nordst. Alg. Exs. No. 905, 1889; Oe. fonticola Al. Br. in Wolle 1887, p. 93, Pl. 75, figs. 4-6; (?) Vesiculifera dissiliens Hass. 1845, p. 202, Pl. 50, fig. 7; Oe. diplandrium Juranyi 1873, p. 27, Pl. 1-3; (?) Oe. fonticola Al. Br. var. flavescens Hansg. 1891, p. 305; Oe. montagnei Fior.-Mazz. var. saxicolum Wittr. 1876, p. 50, Pl. 18, figs. 29-31; Hirn 1900, p. 280, Pl. XLVIII, fig. 311; P. B. A. No. 1190. Dioecious, nannandrous, idioandrosporous; oogonium 1 (very rarely 2-3), obovoid-globose or subglobose, operculate, division superior; oospore subglobose or subellipsoid-globose, almost filling oogonium, spore wall smooth; vegetative cell varying much in the same plant; basal cell elongate; terminal cell obtuse; androsporangium to 10-seriate; dwarf male broadly obovoid, unicellular, on oogonium; vegetative cell 22-29 20-55u; androsporangial vegetative cell 18-27X18-27y; oogonium 34-4534-50u; oospore 32-4031-43yu; androsporangium 17-25 X 6-13; dwarf male 10X 14—15p. OEDOGONIUM. 15 il United States: California; Austria, England, France, Spain, Germany, Hungary, Italy, Ireland, Switzerland, Sweden; Siam. This species is the Oe. diplandrium Juranyi rather widely copied in morphological texts. It is characterized by its short vegetative cells, clustered unicellular dwarf males, and compact and numerous antheridia. It bears some resemblance to the imperfectly known Oe. fonticola (No. 208). 184. Oe. macrandrium Wittrock. (Pl. LVH, fig. 549.) 1870, p. 130, Pl. 1, figs. 3-5; Hirn 1900, p. 233, Pl. XX XIX, fig. 240; Collins 1909, p. 258; Heering 1914, p. 180, fig. 248; Tiffany 1926, p. 106, Pl. IX, fig. 97. Dioecious, nannandrous; oogonium 1-4, globose-ovoid, operculate, division superior; oospore globose, rarely ovoid-globose, not completely filling the oogonium, spore wall smooth; terminal cell obtuse or very shortly apiculate; dwarf male on or near the oogonium, stipe much curved, sometimes 2-3 celled; antheridium 1-7; vegetative cells 15-20 45-1004; oogonium 36-42 43-54u; oospore 31-37 X33-39u; dwarf male stipe 12-13 X 24-33u; antheridium 9-10 7-10y. United States: Ohio, Iowa, Massachusetts, Pennsylvania; England, Finland, France, Germany, Denmark, Norway, Sweden, Switzerland. 184a. Form acuminatum Hirn. (Pl. LVI, fig. 550.) 1900, p. 234, Pl. XX XIX, fig. 241. Dwarf male apically broadly acute; vegetative cell 15-19 30-80u; oogonium 37-45 43-554; oospore 35-40 36-454; dwarf male stipe 11-15 X 24-35u; antheridium 9-13 9-13y. Sweden. 184b. Form aemulans Hirn. (Pl. LVH, fig. 551.) 1906, p. 43; Oe. macrandrium Wittr. var. aemulans Hirn 1900, p. 235, Pl. XX XIX, fig. 242; (2?) Oe. lundense Wittr. in Wolle 1887, p. 79, Pl. 77, figs. 9 and 10. Vegetative celi 10-15 22-90u; oogonium 28-40 33-45u; oospore 26-36 X 26-364; dwarf male stipe 9-12 20-25u; antheridium 8-9X 8-10u. United States: Pennsylvania, California, Michigan, Illinois, Mississippi; Brazil. 184c. Form lundense (Wittrock) Hirn. (Pl. LVII, fig. 552.) 1906, p. 42, Pl. III, fig. 19; Oe. lundense Wittr. 1872, p. 4, and 1874, p. 23; Oe. age Wittr. im Hirn 1900, p. 237, Pl. XL, fig. 245; Oe. fonie Hallas 1905, p. 401, g. 6. Oogonium subobovoid-globose; oospore wall sometimes thick; vegetative cell 13-21 X 13-50u; oogonium 31—40 (-45) «34-48u; oospore 52 THE (O12 DOGON TAGE AE 29-36 (40) 29-36 (-40)u; dwarf male stipe 10-15 (21—) 24-32u; antheridium 8-10 X6-9u. Finland, France, Denmark, Sweden. 184d. Var. propinquum (Wittrock) Hirn. (Pl. LVII, fig. 553.) 1906, p. 42, Pl. IV, fig. 20; Oe. propinquum Wittr. 1870, p. 129, and im Hirn 1900, p. 336, IPL SIG, fig. 243; Oe. eremitum Hallas 1905, p. 403, fig. 8. Smaller; oogonium 1-3; vegetative cell 8-14X18-70u; oogonium 28-36 X 28-45u; oospore 24-31 24-3lu; dwarf male stipe 11-14x 20-35; antheridium 7—9 (—12) *6-8u. United States: Illinois, Alabama; Austria, France, Sweden, Denmark, Latvia. 184e. Var. hohenackerii (Wittrock) Tiffany. (Pl. LVII, figs. 554-556. ) 1929, p. 75; Oe. hohenacherw Wittr. 1874, p. 23, and im Hirn 1900, p. 238, Pl. XL, fiz. 246; Oe. tumidulum in Hohenacker Alg. Exs. No. 404: Vegetative cell 12-15 2445y; oogonium 29-33 30-35; oospore 27-31 28-31u; androsporangium 11-13 10-14u; dwarf male stipe 9-14 18—24u,; antheridium 5-6 X5-8u. United States: Michigan, Ohio; India. 184f. Var. scrobiculatum Ackley. (Pl. LVI, fig. 557.) 1929, p. 305, Pl. XXXVI, figs. 17-19. Oogonium globose to subglobose; median layer of oospore wall scrobiculate; vegetative cell 9-11 27-60u; oogonium 32-35 X30-35y; oospore 31-33X31-32u; dwarf male stipe 1210-184; antheriditum 8X 6-10y. United States: Michigan (Ox-bow of river near Holland). The macrandrium group is perhaps one of the most interest- ing and variable in the genus. The species has rather an unfortunate name to be nannandrous. The group is readily recognized by its frequently seriate oogonia, its curved and twisted dwarf males resting on or near the oogonia and fre- quently clustered, and its relatively short vegetative cells. Oe. laetevirens (No. 182) is separable from the group largely on its smaller size. F. lundense has very short vegetative cells, and those of var. hohenackerii are slightly longer. Var. scrobi- culatum is the only member of the group with scrobiculate oospores. The remaining forms and varieties are separable largely on the basis of size. OEDOGONIUM L553 185. Oe. ciliatum (Hassall) Pringsheim. (Pl. LIX, fig. 583.) Vesiculifera ciliata Hass. 1845, p. 202, Pl. 52, fig. 2; Oe. ciliatum Pringsh. 1856, p. 227, Pl. I, figs. 1-10; Pringsh. 1858, p. 70, Pl. 4, figs. 1-14, and Pl. 5, fig. 8; Oe. piliferum Auerswald in Rabenh. Alg. Sachs. 1855; Hirn 1900, p. 248, Pl. XLI, fig. 253; Heering 1914, p. 183, fig. 252; Tiffany 1926, p. 106, Pl. IX, figs. 98 and 99. Dioecious, nannandrous, gynandrosporous; oogonium 1-7, ovoid, to ovoid-ellipsoid (rarely nearly ellipsoid), operculate, division superior or nearly supreme; oospore ovoid to subellipsoid, rarely globose, nearly filling oogonium, spore wall smooth; androsporangium to 8-seriate, often subepigynous; basal cell elongate; terminal cell setiform; dwarf male curved, on oogonium; antheridium .exterior, 1; vegetative cell 14-24 35-92u; oogonium 43-5055-72u; oospore 40-47 44-57u; androsporangium 14-20 10-204; dwarf male stipe 10-15 24-31y; antheridium 8-10 10-11. United States: Iowa, Ohio; England, Finland, Germany, Spain, Sweden, Latvia; British Columbia. Characterized by its setiform terminal cells and ovoid to ovoid-ellipsoid oogonia. The division of the oogonium is quite often practically supreme rather than superior. It is near Oe. wabashense (No. 192); the latter has capitellate vegetative cells, supreme operculum, and smaller oogonia. 186. Oc. spectabile Hirn. (Pl. XLI, figs. 403-405.) 1900, p. 284, Pl. XLIX, fig. 317. Dioecious, nannandrous, idioandrosporous; oogonium 1, obovoid- ellipsoid or obovoid, operculate, division superior; oospore ellipsoid, nearly filling oogonium, spore wall smooth; androsporangtum to 16- seriate, the androsporangial part of the filament often curved; basal cell elongate; dwarf male broadly obovoid, unicellular, on oogonium; vegetative cell 20-32 25-90u; oogonium 42-50*63-72u; oospore 40-48 X 55-62u; androsporangium 19-27 11-19; dwarf male 11-14 16-21. United States: Mississippi; Australia. Characterized by the wide variation in cell diameter, the unicellular dwarf male, and the pronounced curve of the terminal part of the androsporangial filament. It is similar to Oe. implexum (below) which is smaller and has relatively more slender vegetative cells. 187. Oe. implexum Hirn. (Pl. XLI, figs. 400 and 401.) 1900, p. 283, Pl. XLIX, fig. 316. Dioecious, nannandrous, gynandrosporous; oogonium 1-3, sub- obovoid-ellipsoid, operculate, division superior; oospore ellipsoid, filling oogonium, spore wall smooth; androsporangium to 20-seriate 154 THE OEDO:GONTACEAE (filament containing androsporangia curved); dwarf male broadly obovoid, unicellular, on oogonium; vegetative cell 16—-20*33-100y; oogonium 38-45 X 50-75y: oospore 36-42 47-60z; androsporangium 16-20 X 13-25u; dwarf male 12-14 13-15uy. Australia. Cf. Oe. spectabile, above. : 188. Oe. monile Berkeley and Harvey. (Pl. LVIU, figs. 564 and 565.) In Hooker 1860, p. 342, Pl. 196, fig. B; Wittr. 1874, p. 40; (?) Oe. birmanicum Wittr. in Moebius 1892, p. 430, fig. 9B; Hirn 1900, p. 229, Pl. XXXVIII and XX XIX, fig. 235. Dioecious, nannandrous; oogonium 1-8, subovoid or subglobose, operculate, division superior, very broad; oospore globose or subglobose, quite filling oogonium (except in length), spore wall of three layers: outer layer smooth, middle layer scrobiculate, inner layer smooth; vegetative cell sometimes capitellate; basal cell elongate; terminal cell obtuse; dwarf male a little curved, near oogonium, antheridium exterior, 1—?; vegetative cell 9--1550-160u; suffultory cell 21-29X40-57y; oogonium 30-39 X30-56u; oospore 28-388 x 28-38u; dwarf male stipe 9X 25u; antheridium 7X 7u. United States: Massachusetts, Michigan; Australia; Brazil: 188a. Form borgei Hirn. (Pl. LVIII, fig. 567.) 1900, p. 230, Pl. XX XIX, fig. 237. Vegetative cell 14-2045-100u; suffultory cell 35-38 45-74u; oogonium 40-5040-60u; oospore 39-4539-48u; dwarf male stipe 13-14 x 36-40; antheridium 9-11 8-—10p. Australia. 188b. Var. eminens Hirn. (Pl. LVITI, figs. 568 and 569.) 1900, p. 231, Pl. XX XIX, fig. 238. Much larger; gynandrosporous, androsporangium subepigynous; dwarf male on suffultory cell, antheridium 1-2; vegetative cell 18-25 65-150u; suffultory cell 38-4148-72u; oogonium 56-68% 55-74y; oospore 53-60 50-584; androsporangium 19-23 X 15-18u; dwarf male stipe 18-19 40-48; antheridium 10-13 12-14uy. Australia. 188c. Form victoriense G. S. West. (Pl. LVIM, fig. 566. ) 1909, p. 45, fig. 6 A and B. Dwarf male a little longer and more narrow, on suffultory cell; vegetative cell 12-14 60—96y; suffultory cell 27-28 X 68-83y; oogonium 42-45 X42-52u; oospore 40-42 X 40-42u; dwarf male stipe 6-8 X38—-44u. Victoria, Africa. OEDOGONIUM 15: Ol - The species is characterized by its scrobiculate oospore, wide operculum, enlarged suffultory cell, and usually many-seriate oogonia. Var. eminens is much larger and f. borgei is con- siderably larger than the type; f. victoriense is near f. borgei, differing in the size of the oospore. 189. Oe. obtruncatum Wittrock. (Pl. LIX, fig. 577.) 1874, p. 41; Hirn 1900, p. 284, Pl. XLIX, fig. 318. - Dioecious, nannandrous, gynandrosporous; oogonium 1-6, ellipsoid, or globose-ellipsoid, operculate, division supreme, operculum small and deciduous; oospore of same form as oogonium, nearly filling it, spore wall smooth; vegetative cell evidently capitellate; basal cell elongate; terminal cell (often the oogonium) apically obtuse; dwarf male oblong- pyriform, curved, unicellular, on oogonium; vegetative cell 18-22 56-110u; oogonium 45-55 56-68u; oospore 48-53 52-664; andro- sporangium 2024u; dwarf male stipe 17—-2036-40u; antheridium 6-8 X 4-6. United States: Ohio, Illinois; England; Brazil; India; Aus- tralia. 189a. Var. completum Hirn. (Pl. LIX, figs. 579-582. ) 1900, p. 285, Pl. L, fig. 319. Oogonium larger; androsporangium 1-5, hypogynous or subepigynous or epigynous; terminal cell sometimes setiform; vegetative cell 18-22 66-150n; oogonium 55-58 X63-75u; oospore 538-5661-73yu; andro- sporangium. 20-22 x 19-22. Bengal. 189b. Var. ellipsoideum Wittrock. (Pl. LIX, fig. 578.) 1878, p. 141; Hirn 1900, p. 286, Pl. L, fig. 320. Oogonium longer, ellipsoid, 1-2, terminal; vegetative cell 17-23 54-110u; oogonium 42-54 « 66—-75u. Venezuela. a Oe. obtruncatum is characterized by the usually capitellate vegetative cells, supreme position of the operculum, unicellular nannandrium, and gynandrosporous habit. The two varieties completum and ellipsoideum are separable largely on the basis of differently sized oogonia. The species is much larger than the gynandrosporous Oe. wabashense (No. 192). It is perhaps nearest in general appearance to Oe. praticolum (No. 190) and Oe. supremum (No. 191), both of which are idioandrosporous and have larger oogonia. 156 DAE OE DOG ONDTACEAE 190. Oe. praticolum Transeau. (Pl. LX, figs. 586-588.) 1914, p. 298, Pl. XXIX. figs. 1-5; Tiffany 1926, p. 107, Pl. VII, figs. 82-84. Dioecious, nannandrous, idioandrosporous; oogonium 1-7, ellipsoid to globose-ellipsoid, often terminal, sometimes scattered; wall some- times rather thick, operculate, division stipreme, lid small and deciduous; oospore ellipsoid to globose-ellipsoid, quite filling the oogonium, wall smooth, androsporangium 1-20; vegetative cell slightly capitellate; basal cell usually elongate; terminal cell apiculate or extended into a long hyaline seta; antheriditum exterior, 1; vegetative cell, female 16-26 X65-130u; vegetative cell of androsporangial filament 14-22 56-1104; oogonium 48-6062-74y; oospore 46-58 X60-72y; andro- sporangium 20-24 x 18—22u; dwarf male stipe 8-14 21—28u; anther- idium 6-10 7-12u. United States: Illinois, Ohio, Iowa. Cf. Oe. obtruncatum (No. 189). 191. Oe. supremum Tiffany. (Pl. LIX, figs. 573-576.) 1924) p» 185, Pl. I, figs. 3 and 4, Pl. Il, figs. 4 and 5; 1926; p: 107; Pl) VILL, figs. 90 and 91. Dioecious, nannandrous, idioandrosporous; oogonium 1-4, globose or ellipsoid-globose, often terminal, operculate, division at the upper extremity of oogonium, lid often deciduous; oospore globose or ellipsoid- globose, filling oogonium, spore wall smooth; androsporangium 1-6; vegetative cell distinctly capitellate; basal cell elongate; dwarf male broadly obovoid, unicellular, on oogonium; vegetative cell 24-32 60-132u; oogonium 66-78 X72-90u; oospore 60-66 66—-84u; andro- sporangium 26—28x30-40u; dwarf male 20-24 24-26u; basal cell 28-32 X 90-110x. United States: Iowa. Cf. Oe. obtruncatum (No. 189). 192. Oe. wabashense Tiffany. - (Pl. LX, figs. 584 and 585.) 1927, p. 208, Pl. IX, figs. 3-5. Dioecious, nannandrous, gynandrosporous; oogonium 2-3, ellipsoid or ovoid, often terminal, operculate, division supreme, lid often decid- uous; oospore ellipsoid or ovoid (rarely globose), filling oogonium or not, spore wall smooth; androsporangium 1-3, subepigynous; vegetative cell capitellate; basal cell elongate; dwarf male on oogonium; anther- idium 1—?; vegetative cell 12-20 36-64; oogonium 36-42 44—60y; oospore 34-38 X40-55u; androsporangium 12-16 10—20u; dwarf male stipe 12-1624-40u; antheridium 7—-12X6-10yu; basal cell 18-20 40-644. United States: Indiana, Ohio. Cf. Oe. ciliatum (No. 185) and Oe. obtruncatum (No. 189). OEDOGONIUM Toe 193. Oe. tentoriale Nordstedt and Hirn. (Pl. LXI, fig. 597.) In Hirn 1900, p. 248, Pl. XLII, fig. 260. Dioecious, nannandrous; oogonium 1, terminal, broadly ellipsoid or obovoid-globose, division supreme, lid small, deciduous, oogonium wall longitudinally ribbed on the inner surface, ribs often anastomosate; oospore quite filling oogonium, outer layer of the spore wall with 40-45 longitudinal, very finely crenulate ribs, closely filling in between the ribs of the oogonium, connected by delicate transverse lines, inner layer smooth; basal cell elongate; terminal cell obtuse; dwarf male suberect, on suffultory cell, antheridium exterior 1—?; vegetative cell 20-33 (-37) 60-225; oogonium 66-82X73-88y; dwarf male stipe 10-15 X37-48u; antheridium 9-12 7u. United States: Illinois; Brazil. Cf. Oe. acrosporum (No. 195). 194. Oe. michiganense Tiffany. (Pl. LXI, figs. 594-596.) 1927505 20D el exe iss OSI. Dioecious, nannandrous, gynandrosporous; oogonium 1-7, globose to ellipsoid-globose (rarely subglobose), operculate, division at the upper extremity of the oogonium; oospore globose, filling the oogonium or not, outer layer of spore wall smooth, middle layer with 12-24 crenulate, sometimes anastomosing, longitudinal ribs, inner layer smooth; suffultory cell enlarged; vegetative cell broadly capitellate; basal cell elongate; terminal cell, occasionally oogonium, apically obtuse; dwarf male, a little curved, on suffultory cell, antheridium interior; vegetative cell 12-24 80-160y; suffultory cell 32-48 x 64-80u; oogonium 50-64 50-80u; oospores 44-60 44-60u; androsporangium 16-20 x 16—20u; dwarf male 14-20 X40—56y; basal cell 18-20 70-100u. United States: Michigan. The only nannandrous member of the genus possessing a capitellate vegetative cell, a supreme operculum, and longi- tudinally ribbed oospores. 195. Oe. acrosporum De Bary. (Pl. LX, fig. 589.) 1854, p. 47 et seq., Pl. 3, figs. 1-12; Oe. acrosporum De Bary f. connectens Wittr. in Wittr. and Nordst. Exs. No. 1101, 1893, ix P. B. A. No. 409, 1898, zx Hirn 1900, p. 245, Pl. XLI, fig. 255; Hirn 1900, p. 244, Pl. XLI, fig. 254; Collins 1909, p. 259; Heering 1914, p. 183, fig. 253; Tiffany 1926, p. 107, Pl. IX, fig. 103. Dioecious, nannandrous, gynandrosporous (or idioandrosporous) ; oogonium 1, terminal, ellipsoid, operculate, division supreme, operculum small and deciduous; wall of oogonium with longitudinal, sometimes anastomosing, ridges on the inner surface; oospore quite filling the oogonium, outer layer of spore wall with 23-30 longitudinal ridges, closely fitting in between the ridges of the oogonium, inner smooth; basal cell elongate; terminal cell obtuse; androsporangia 1-2, hypo- 158 LHE: ObD.OGONLACEAS gynous; dwarf male curved, on the suffultory cell, stipe sometimes 2-3 celled, upper cells long, antheridium exterior, 1-2; vegetative cell 12-21 40-125u; suffultory cell 16-25 26-76u; oogonitum 35-48X 50-63; androsporangium 16-21 12-15u; dwarf male stipe, upper cell 6-8 X 55-71; lower cell 9-12 X 30-38y; antheridium 6-8 X9-15yu United States: Ohio, Illinois, Iowa, Michigan, New York, Massachusetts; Austria, England, Finland, France, Germany, Norway, Sweden; Brazil; Manchuria; ‘Madagascar; British Columbia. 195a. Form boreale (Wolle) Hirn. (Pl. LX, fig. 590.) 1900, p. 245, Pl. XLI, fig. 256; Oe. acrosporum De Bary var. boreale Wolle 1887, p. 84, Pl. 79, figs. 10 and 11. Filaments few-celled; vegetative celi 14-16 45-80p. United States: Pennsylvania, New Jersey. It is very doubtful if this form of the genus is tenable. The plant described by Wolle seems to have had fewer cells to the filament than the species proper. From data at hand regarding other species, it appears this variability in the num- ber of the cells is largely a matter of environmental conditions. There are some species in the genus, however, that are never found except with very few cells to a filament. The form is retained until more definite data can be secured regarding its variations. If itis normally few celled, Wolle’s varietal position must be maintained. 195b. Var. bathmidosporum (Nordstedt) Hirn. (Pl. LX, fig. 592.) 1900, p. 246, Pl. XLII, fig. 259; Oe. bathmidosporum Nordst. 1878, p. 179; Oe. acrosporum De Bary in Gutw. “1897, p. 8; Oe. acrospermum De Bary in P. B. A. No. 163, 1896. Smaller; ribs fewer, 11-17, evidently crenulate; dwarf male stipe unicellular; vegetative cell 12-17X35-125y; suffultory cell 15-22X 40-110u; oogonium 30-4040-54u; dwarf male stipe 9- DE Ne antheridium 8-10 X9-12n. United States: Massachusetts; Austria, Sweden; Brazil. 195c. Var. floridense Wolle. (Pl. LX, fig. 593.) 1887, p. 83, Pl. 85, figs. 1 and 2; Hirn 1900, p. 246, Pl. XLI, fig. 258. Smaller with elongate vegetative cell and more tumid suffultory cell; dwarf male stipe 2-3 celled; vegetative cell 7-8 X 36-85; oogonium 33-39 X 45-50. United States: Florida. The only record is that of Wolle. OEDOGONIUM 159 195d. Var. majusculum Nordstedt. (PI. LX, fig. 591.) 1878a, p. 21, Pl. 2, figs. 17-18; Hirn 1900, p. 246, Pl. XLI, fig. 257. Smaller; vegetative cell 14-2150-165y; suffultory cell 18-28x 42-65u; oogonium 44-56 X 54-70u. Australia. Oe. acrosporum is readily identified by its single terminal oogonium and by the dovetailing of the longitudinal ridges of the inner surface of the oogonium and outer surface of the oospore. The varieties and form (see note under each) are separable largely on the basis of number of ribs and size of cells. The species is easily distinguished from Oe. tentoriale (No. 193) by its smaller number of longitudinal ribs on the oospore, by its more slender cells, and differently shaped oogonia. SPECIES IMPERFECTLY KNOWN. The following members of the genus are recorded with varying degrees of certainty regarding their validity. A few are unquestionably readily recognized even though a complete description is not available or possible at the present status of our knowledge. Some are very near other species, differing in one or more characters, but lacking sufficient completeness of description to warrant definite placement in the genus. Others are included purely as a matter of record. Wherever possible, the species is included in the key in its probably proper position, with the idea of calling it to the attention of the student of the genus and thereby aid in its identification if collected. Appropriate remarks occur in connection with the description of each species. 196. Oe. tapeinosporum Wittrock. (Pl. XXXIV, fig. 314.) 1874, p. 36; 1878, p. 140; De Toni 1889, p. 76; Oe. tapeinosporum var. Angolense West and West 1897, p. 5; Hirn 1900, p. 297, Pl. XXIII, fig. 117; Heering 1914, p. 224, fig. 344; Tiffany 1926, p. 96, Pl. VII, fig. 81. Oogonium 1-2, depressed-globose, operculate, division median, distinct; oospore depressed-globose, not (rarely nearly) filling oogonium, spore wall smooth; basal cell subhemispherical; termina! cell obtuse; vegetative cell (2-) 3-5X1040u; oogonium 15-19 (14-) 17-23; oospore 13-16 8—14y; basal cell 12-14 5-7y. United States: Iowa; England, Germany; Columbia; Africa; India. 160 THE OEDOGONIACEAE This species is rather readily distinguished by its conspicuous operculum and small size. No antheridia have been observed thus far. The Iowa material combined the characters of the type and the variety Angolense, and the latter thus becomes untenable. The species is perhaps dioecious, macrandrous. 197. Oe. angustissimum West and West. (Pl. XXV, fig. 220.) 1897, p. 6; Hirn 1900, p. 314, Pl. L, fig. 321. (?) Monoecious; oogonium 2, transversely inflated; oospore trans- versely elliptical and inflating oogonium, wall smooth; filament irregu- larly flexed and very narrow; vegetative cell 1.8-2X 13--28u; oogonium 9.5X 10.5-14.5y; oospore 9.5 X6.5y. Africa. As far as is known, this is the smallest species of Oedo- gonium. Cf. Oe. inconspicuum (No. 198) and Oe. tapeinosporum (No. 196). 198. Oe. inconspicuum Hirn. (Pl. XXXIV, fig. 313.) 1895, p. 23, Pl. 1, fig. 8; 1900, p. 296, Pl. XXIII, fig. 116; (?) Oe. minutissimum Grun. in Hansgirg 1905, p. 436. (? Dioecious, macrandrous) Oogonium 1 (rarely 2-3), depressed- or subpyriform-globose, operculate, division median, narrow; oospore depressed-globose, filling the inflated part of oogonium, spore wall smooth; vegetative cell-3—-5 x 20-34; oogonium 138-18 (13-) 17-23; oospore 12-17 X8-12p. Columbia; Finland, Austria, Sweden. In common with most of the smaller sized species of the genus, Oe. inconspicuum is found attached to other alge or to submerged macrophytes. Cf. Oe. angustissimum above and Oe. tapeinosporum (No. 196). 199. Oe. tenuissimum Hansgirg. 1888a, p. 398; 1888, p. 222; Hirn 1900, p. 315. (2) Monoecious; filament irregularly curved; oogonium 1, subpyri- form, pore median; oospore globose-ellipsoid, not filling oogonium; vegetative cell 2.3-6X9-25yu; oogonium 9-18 X 14-23; oospore 15y in diameter. Austria. Characterized by its median pore and elongated oogonium; cf. Oe. sexangulare (No. 135) and Oe. pusillum (No. 200). OEDOGONIUM 161 200. Oe. pusillum Kirchner. (Pl. XXXIV, fig. 316.) 1878, p59; (?) Oe. excisum Wittr. and Lund. in Nordst. 1880, p. 13; Oe. africanum Lagerh. 1893, p. 155; Oe. Klebahnit Lemm. 1893, p. 509, and 1895, p. 28, figs. 4 and 5; ibid. in De Wildemann 1896, p. 66, Pl. 5, figs. 2-7; Oe. africanum Lagerh. in Lemm. 1896, p. 502, Pl. 5, figs. 3-20; Hirn 1900, p. 299, Pl. XXIV, fig. 125; Collins 1912, p. 88; Heering 1914, p. 224, fig. 345; Tiffany 1926, p. 95, Pl. VII, fig. 80. Oogonium 1 (rarely 2), subbiconic-ellipsoid or subbiconic-globose, seen from above circular, margin even, operculate, division wide; oospore ellipsoid or globose, generally constricted at the middle, not quite filling oogonium, spore wall smooth; basal ce!l subhemispherical; terminal cell obtuse or obtusely conical; vegetative cell 3-6 10—-60y; oogonium 14-16 X 15-254; oospore 11-13 X 13—-15y; basal cell 7-8 x 7-8yu. United States: Iowa, Illinois; Austria, France, Germany; Africa; Brazil; Sumatra. This species is usually very readily recognized by its medianly constricted oospore, and whether eventually found to be monoecious or dioecious, it is a distinct species. 201. Oc. selandiz Hallas. (Pl. XXXVIII, fig. 359.) 1905, p. 496, fig. 14; Hirn 1906, p. 20, Pi. ITI, fig. 11. (?) Monoecious; oogonium 1-2, oblong (or angular-oblong), opercu- late, division superior; oospore oblong-ellipsoid or obovoid, completely filling oogonium or not; vegetative cell 3-5 X 13-40u; oogonium 9-14 X | 27-30u; oospore 7-12 X 16-25py. Denmark. To be compared with Oe. gracillimum (No. 114) and with Oe. rugulosum (No. 179). 202. Oe. sancti thomee Wittrock and Cleve. (Pl. XXXVIII, fig. 360.) In Witt. 1874, p. 40; 1878, p. 141; Hirn 1900, p. 304, Pl. XXIX, fig. 173; Collins 1909, p. 265. Oogonium 1-3, pyriform, operculate, division superior; oospore pyriform-obovoid, not quite filling oogonium, spore wall smooth; basal cell subhemispherical; terminal cell very slender, subhyaline; vegetative cell 7-15 X 16-88y; oogonium 28-33 XK 36—-50u; oospore 25-30 X 28-35; basal cell 14-23 X8-12uy. United States: Mississippi, Ohio; West Indies (St. Thomas). Material from Mississippi and Ohio have been referred to this species, although antheridia were not observed. It is perhaps dioecious, macrandrous. 162 TRE ORDIOGCONTUNG EAE . 203. Oe. fusus Hallas. (Pl. XXXIV, fig. 311.) 1905, p. 407, fig. 15; Hirn 1906; p. 14, Pl. IV, fig. 26. (?) Dioecious; oogonium 1, ellipsoid, operculate, division median; oospore globose, not filling oogonium, spore wall smooth; vegetative cell 2-3 < 10-23u; oogonium 14-15 31-35y; oospore 12 12y. Denmark. Characterized by its small size and ellipsoid oogonium with globose oospore. Cf. Oe. inconspicuum (No. 198) and Oe. pusillum (No. 200). 204. Oe. rhodosporum (Welwitsch) Wittrock. (Pl. XL, figs. 388 and 389.) 1874, p. 34; De Toni 1889, p. 72; Hirn 1900, p. 305, Pl. XXXI, fig. 193. Dioecious (? macrandrous or nannandrous); oogonium 1-3, obovoid to globose obovoid, operculate, division superior; oospore same form as oogonium, nearly or quite filling oogonium, spore wall smooth; antherid- ium (? androsporangium) =o; vegetative cell 16-23 X 20— -66u; oogonium 35-44 X 45-54; oospore 33-41 X 38-484; antheridium (? androsporang- ium) 16-19X9-17p. France, Portugal. To be compared with Oe. pluviale (No. 183) and with the two following species. 205. Oe. vesicatum (Lyngbye) Wittrock. (Pl. XL, figs. 386 and 387.) Conferva vesicata Lyng. 1819, p. 140, Pl. 47, fig. D1; Oe. vesicatum Wittr. 1874, p. 39; Hirn 1900, p. 306, Pl. XXXI, fig. 194. Dioecious, oogonium 1, obovoid or globose-obovoid, operculate, © division superior; oospore same form as oogonium which it nearly fills, spore wall smooth; antheridium (? androsporangium) 1-4; vegetative cell, female 17-23 X 22-74: male (? androsporangial) 16— -21X28-63y; oogonium 40-45 x 49-60u; oospore 35-42 X 40-48; antheridium C and- rosporangium) 16-18 X 11-16p. Denmark. Cf. Oe. rhodosporum above and Oe. montagne below. 206. Oe montagnei Fiorini-Mazzanti. (Pl. XL, figs. 390 and 391.) 1860, p. 259, Pl. 1, figs. 1, 2 and 5; Wittrock 1874, p. 41; Hirn 1900, p. 307, Pl. XXXI, fig. 195. Oogonium 1-2, obovoid or globose-obovoid, operculate, division superior; oospore of same form as oogonium, filling it or nearly so, spore wall smooth; vegetative cell 18-26 x 20- 1104; oogonium 40-52 48—65u; oospore 38 47 X43— —52u. Italy. Cf. Oe. rhodosporum (No. 204) and Oe. vesicatum (No. 205). OEDOGONIUM 163 = * 207. Oe. flexuosum Hirn. (Pl. XL, fig. 394. ) 1900, p. 318, Pl. XLVIII, fig. 310. Oogonium 1, obovoid or obovoid- Blonece operculate, division superior; oospore same form as oogonium and filling it, spore wall smooth; filament irregularly curved; vegetative cell 15-18 X12-32u;- oogonium 29-34 X 29-43; oospore 27-32 27-37 pu. Ireland. Characterized by its curved filaments and short cells. Cf. Oe. fonticola (No. 208) and Oe. implexum (No. 187). 208. Oc. fonticola Al. Braun. (Pl. XLI, fig. 402.) In Kuetz. 1849, p. 368, and 1858, p. 13, Pl. 40, fig. 2; Oe. rhodosporum (Welw.) Wittr. 1876, p. 47; Hirn 1900, p. 313, Pi, LUX: fig. 315: Heering 1914, p. 225, fig. 341; Tiffany 1926, p. 106. Dioecious; oogonium 1-2, obovoid or globose-obovoid, operculate, division superior; oospore obovoid-ellipsoid or subglobose, nearly or quite filling oogonium, spore wall smooth; vegetative cell 16-32X 12-70y; oogonium 36-43 (-45) *48-56u; oospore 34-41 (-43) x 40-49u. United States: Iowa, Indiana, Mississippi; Austria, Italy, Spain, Germany, England. Cf. Oe. implexum (No. 187), Oe. flexuosum (No. 207), and Oe. pluviale (No. 183). West (1912) records the presence of very small apparently male filaments of Oe. fonticola, indicating a condition intermed- iate between ‘‘truly dioecious macrandrous species and those with large nannandria.’’ If these are really male filaments, the species becomes dioecious, macrandrous. Until the data are more complete, Oe. fonticola must remain in the imperfect- ly known division of the genus. 209. Oe. oryze Wittrock. (Pl. XXI, fig. 190.) 1876, p. 51, Pl. 13, figs*32 and 33; Hirn 1900, p. 294, Pl. XXII, fig. 118. Oogonium 1-2, scarcely tumid, subobovoid or subcylindric, pore superior; oospore of same form as oogonium, nearly filling it or some- times enlarging it, spore wall smooth; basal cell elongate; terminal cell acuminate; vegetative cell 24-39X36-120y; suffultory cell 45x 56-90u; single or upper series of oogonium 45-55X65-95u; lower series of oogonium 43-53 X 45-57; oospore 41-51 (44—) 60-80u. United States: Mississippi; Italy. 164 Es) Ou D O'G ONDA CE AE 209a. Var. seriosporum (Lagerheim) Hirn. (Pl. XXI, figs. 191 and 192.) 1900, p. 294, Pl. XXII, fig. 114; Oe. seriosporum Lagerh. 1888, p. 590. More variable, oogonium sometimes 2-5, lower series of oogonium _ subcylindric or cylindric-globose; vegetative cell 24-42 (-54) X38-120y; oogonium, single or wpper series, 48-6060—-99y, lower series 42-54 (35—-) 48-52u; oospore 40-56 & 40-75y. Germany. Characterized by the variation in the size of the oogonia and the vegetative cells on the same plant, the species is some- what near Oe. mexicanum (No. 44). The variety is even more variable than the species, and its oogonia are more seriate. 210. Oe. virceburgense Hirn. (Pl. XXXVI, fig. 336.) 1896, p. 8; 1900, p. 301, Pl. XXIV, fig. 128; 1906, p. 54. Oogonium 1-8, subpyriform- to subdepressed-globose, operculate, division a little above median; oospore subdepressed- or depressed- globose, quite filling oogonium, spore wall smooth; vegetative cell often broadly capitellate; basal cell half round; vegetative cell 4-6 X 138-45; oogonium 15-20 15-23y; oospore 14-19 X 14-17u. Austria, Germany, Hungary. To be compared with the slightly larger Oe. spurium (below) and with Oe. petri (No. 90). 211. Oe. spurium Hirn. (Pl. XXXVI, fig. 333.) 1900, p. 301, Pl. XXIV, fig. 131. Oogonium single, subdepressed- or depressed-globose, operculate, division supramedian; oospore of the same form as oogonium, nearly or completely filling it, spore wall smooth; vegetative cell capitellate; basal cell elongate; terminal cell apically obtuse or truncate-obtuse; vegetative cell 9-13 X 20-55y; oogonium 26-29 X 23-28; oospore 24-28 X 21-24. United States: Ohio; Brazil. Cf. Oe. virceburgense above. It also has considerable resemblance to the longer celled filaments of Oe. sphaerandrium (No. 105). 212. Oe. velatum Hallas. (Pl. XLI, figs. 398 and 399.) 1905, p. 405, fig. 11; Hirn 1906, p. 23, Pl. IV, fig. 27. Oogonium single, ellipsoid-globose, operculate, division superior; oospore globose, not filling oogonium, middle layer of spore wall echinate; vegetative cell 3-20 25--400u; oogonium 4368; oospore 35X35y. Denmark. OEDOGONIUM 165 The cell diameter is extremely variable. The echinate appearance of the oospore is questioned by Hirn (1906), who thinks the oospore may be parasitized. _ 213. Oc. pilosporum West. (Pl. XL, fig. 395.) 1891, p. 109, Pl. 18, fig. 3; Hirn 1900, p. 318, Pl. L, fig. 325. Oogonium single, oblong-ellipsoid, somewhat narrowed at the upper extremity; oospore subglobose, spore wall thick and outer layer densely pilose, the hairs short; vegetative cell 11-12 55-70; oogonium 23 x 48y; oospore (without hairs) 19X21u; oospore wall 2u thick. Spain. The above dimensions and description are copied gingerly by Hirn (1900). From West’s figure one is inclined to agree with Hirn that the ‘‘oospore’’ may be nothing more than a fungal parasite within the oogonium. 214. Oe. hoehnei Borge. (Pl. XXVIII, fig. 251.) 19255 pel2jeelel fies le (?) Dioecious, macrandrous; oogonium single, ellipsoid, pore super- ior; oospore globose, not filling oogonium in length, outer spore wall smooth, middle wall areolate; vegetative cell 43-44 X 148-240u; oogon- ium 66-72 99-108; oospore 63-65 X 63-65u. E Paraguay. This species has spore markings similar to those of Oe. areolatum (No. 59). 215. Oe. giganteum Kuetzing; Wittrock. (Pl. XXIX, fig. 260.) Kuetz. 1845, p. 200; 1853, p. 12, Pl. 37, fig. 2; Wittr. 1874, p. 42; Hirn 1900, p. 295, Pi Sea, fis: 115: (?) Dioecious, macrandrous; oogonium 1, cylindric-obovoid, pore superior; oospore cylindric-ellipsoid or subellipsoid, nearly filling oogonium, spore wall in three layers: outer smooth, middle layer with 25-30 longitudinal rows of pits, inner layer smooth; vegetative cell 30-50 X 60-225y; suffultory cell 40-6060-210u; oogonium 53-69 67—106u; oospore 51-65 X 65-103. United States: Ohio; Austria, England, Denmark, Germany, Sweden. This species is rather readily identified by its large size and by the longitudinal rows of distinct pits in the middle layer of the oospore wall. It is separable from Oe. capense (No. 216) by its larger size. The arrangement of pits and general appear- ance are somewhat similar to the nannandrous Oe. concatenatum 166 THE OEDOGONIACEAE (No. 151). It is doubtless a distinct species, no matter what its final description may be. 216. Oe. capense Nordstedt and Hirn. (Pl. XXIX, fig. 257.) In Hirn 1900, p. 293, Pl. XV, fig. 88. Oogonium 1-3, obovoid to ellipsoid, pore. superior; oospore of same form as oogonium and filling it, spore wall in three layers: outer smooth, middle pitted, with pits in 25-30 longitudinal rows, inner layer smooth; basal cell elongate; vegetative cell 13-17 X40-100yu; oogonium 35-38 X 53-58; oospore 33-35 X 46-48. Africa. This species is perhaps dioecious, macrandrous, although - antheridia are unreported. Cf. Oe. giganteum above. 217. Oe. moniliforme Wittrock. (Pl. XII, fig. 114.) 1874, p. 40; Hirn 1900, p. 288, Pl. V, fig. 28. Oogonium 1-5, pyriform to globose-obovoid or subglose, pore supramedian; oospore globose or subdepressed-globose, not filling oogonium, middle layer of spore wall scrobiculate; terminal cell apically obtuse; vegetative cell 9-11X30-54y; oogonium 23-28 28-35y; oospore 22-27 X 22-26n. United States: Michigan, Ohio; Sweden. - The small size of this species together with its definitely scrobiculate spore wall makes it readily identifiable, even though antheridia have not been so far observed. 218. Oe. inerme Hirn. (Pl. XI, fig. 110.) 1900, p. 287, Pl. II, fig. 10. (?) Dioecious; macrandrous; oogonium single, subdepressed- or subpyriform-globose, pore median, rimiform and narrow; oospore depressed- or subdepressed-globose, not filling oogonium, spore wall smooth; vegetative cell 12-14X56-96u; oogonium 37-389X3445y; oospore 33-38 X 28-32u. England, France, Germany. 218a. Var. mentiens Hirn. (Pl. XI, fig. 111.) 1900; p: 287, PILL fies 1: Smaller; oogonium depressed- to pyriform-globose; oospore some- times nearly globose; vegetative cell 9-1137—-90u; oogonium 28-32 33-45; oospore 27—29 XK 25-28. France. The species is to be compared with Oe. sociale (No. 6), Oe. rufescens (No. 4), and Oe. laeve (No. 1). Var. mentiens is smaller. OEDOGONIUM 167 219. Oc. sol Hirn. (Pl. XXXITT, fig. 286.) 1900, p.. 303, Pl. XXVIII, fig. 164. Oogonium single, globose, operculate, division superior; oospore globose, completely filling oogonium, spore wall of three layers: outer smooth, middle with 35-45 granulate ribs sometimes anastomosate, inner smooth; vegetative cell 13-15X65-110y; oogonium 46-55x 46—55u; oospore 44-53 x 44-53. Brazil. If found to be dioecious, macrandrous, it is near Oe. tumt- dulum (No. 73) and should perhaps be considered a variety of it. 220. Oe. urceolatum Nordstedt and Hirn. (Pl. XXVII, figs. 238 and 239.) In Hirn 1900, p. 293, Pl. XIV, fig. 81. Oogonium 1, obpyriform (rarely oblong-ellipsoid or subellipsoid), pore superior; oospore globose-ellipsoid or ellipsoid, not filling oogonium lengthwise, inflating lower part of oogonium, spore wall in three layers: outer smooth, middle with 15-20 entire, longitudinal ribs, sometimes anastomosate and often spirally curved, inner layer smooth; basal cell elongate; vegetative cell 24-30 120-210u; oogonium 58-70 100-125; oospore 54-60 X 58-70x. Brazil. To be compared with the monoecious Oe. paulense (No. 52) and with the dioecious Oe. boscit (No. 55). 221. Oe. londinense Wittrock. 1874, p. 39; Cooke 1884, p. 170, Pl. 65, fig. 4; Hirn 1900, p. 317. Oogonium: 1-2, globose, operculate, division median; oospore globose, quite filling oogonium; (?) antheridium 1-2, hypogynous; vegetative cell 10-15X15-75u; oogonium 33-35X33-43u; oospore 27-32 X 27-32u; (?) antheridium 12 10-11p. England; (?) New Jersey. This species is very uncertain and Cooke’s figure helps none. It has very much the appearance of Oe. areschougiit (No. 160) except for Wittrock’s suspicion that it is monoecious. Quite likely Wittrock was wrong, and the ‘‘antheridia’’ are in reality androsporangia. 222. Oe. consociatum Collins and Hervey. (Pl. XL, fig. 396.) 1917, p. 37, Pl. I, figs. 1-4; Collins 1918, p. 65; P. B. A. No. 2068. Dioecious, ? macrandrous; oogonium single, globose to depressed- globose, operculate, division median to superior, narrow but distinct; oospore globose to depressed-globose, filling oogonium, spore wall smooth; basal cell depressed-globose; vegetative cell, more or less 168 LAE (OED OGONTACEAE distinctly clavate, 6-12 (-20) X6—50u; oogonium 28-26 X 28y; oospore 26 X 24-26; basal cell 20-24 X 12-16u. Bermuda. Characterized by its frequently short and clavate vegetative cells and depressed-globose basal cells. Its general appearance is near that of Oe. vesicatum (No. 205), Oe. montagne (No. 206), and Oe. pluviale (No. 183). Its resemblance to Oe. inversum (No. 77), noted by Collins and Hervey, seems to the writer quite far-fetched. The so-called ‘‘stellate clusters’’ of young plants may be merely the development of numerous zoospores accidentally lodged in one mass. 223. Oe. lageniforme Hirn. (Pl. XX, fig. 187.) 1900, p. 291, Pl. XIII, fig. 68. (?) Dioecious, macrandrous; oogonium 1, obpyriform (in section sometimes trinodulose), pore superior; oospore globose to ellipsoid, occupying the lower part of the oogonium, spore wall smooth; vegetative cell 11-13 45-90u; oogonium 33-36 X48-63u; oospore 29-31 31-38y. Brazil. In spite of the incomplete description this species is readily recognized by its inferiorly inflated oogonium and its relatively smaller oospore. It bears some resemblance to the monoecious Oe. pseudoboscit (No. 27). 224. Oc. poecilosporum Nordstedt and Hirn. (Pl. XXXIV, fig. 305.) In Hirn 1900, p. 298, Pl. XXIII, fig. 124. Oogonium 1-2, ellipsoid to depressed-globose (sometimes globose or subglobose), operculate, division median, broad; oospore of same form as oogonium, which it nearly fills, spore wall smooth; terminal cell apically obtuse; vegetative cell 6-8 X 20-47; oogonium 24-28 X 25-38y; oospore 23-26 X 21—-28y. Africa. Compare with Oe. gunnii (No. 101) and Oe. psaegmatosporum (No. 83). 225. Oe. inflatum Hallas. (Pt. XXI, figs. 193 and 194.) 1905, p. 408, fig. 16; Hirn 1906, p. 16, Pl. I, fig. 1. (?) Dioecious; oogonium 1—2, often terminal, subglobose or ellipsoid- globose, poriferous, pore variable between supramedian and nearly OEDOGONIUM 169 superior; oospore globose, not filling oogonium, spore wall smooth; basal cell elongate; vegetative cell of considerable variation in diameter, the terminal cell often narrow and produced into a long hyaline seta; vegetative cell 6-27X12-480u; oogonium 37-4954—-76u; oospore 28-35 X 28-35y. Denmark. Cf. Oe. tyrolicum (No. 14) and Oe. urbicum (No. 11). The chief characteristics of Oe. inflatum are the variable position of the pore, the considerable variation in size of the vegetative cell, and the long, narrow hyaline sete. 226. Oe. warmingianum Wittrock. (Pl. XV, fig. 148.) 1878, p. 140; Hirn 1900, p. 290, Pl. XII, fig. 65. Oogonium single, ellipsoid-ovoid, pore superior; oospore ellipsoid- globose, not filling oogonium in length, spore wall smooth; (? antheridium subepigynous) ; vegetative cell 8-9 X32-63y; oogonium 35 X 53y; oospore 30X33u. Brazil. It is impossible to determine with any degree of certainty the position of this species in the genus because of the very inadequate description. 227. Oe. calvum Wittrock. (Pl. XXXIV, figs. 309 and 310.) 1874, p. 37; Oe. vesicatum Link in Rabenhorst Alg. Europe 1873; Hirn 1900, p. 316, Pl. L, fig. 323. Oogonium 1-5, subdepressed-globose, operculate, division median; vegetative cell 7-9X22-40u; oogonium 27-30 25-30u. India. Cf. Oe. poecilosporum (No. 224), Oe. latiusculum (No. 81), and Oe. pratense (No. 80). 228. Oe. inclusum Hirn. (Pl. XL, fig. 397.) 1895, p. 21, Pl. 1, fig. 4; 1900, p. 318, Pl. L, fig. 324; Fremy and Meslin 1926, p. 124, fig. 8 Oogonium 1, suboblong-ellipsoid, wall thickened; oospore ellipsoid or suboblong-ellipsoid, not completing oogonium or sometimes enlarg- ing it, spore wall slightly rugulose; basal cell elongate; vegetative cell 8-12X33-150y; oogonium 24-30 X48-55y; oospore 18-23 X38-48u. Finland, France. 170 THE “OE D-OGONTACE Ar 229. Oc. plicatulum Wittrock. (Pl. LVI, fig. 535.) 1874, p. 38; Hirn 1900, p. 310, Pl. XLVII, fig. 296; Oe. rothit Breb. in Rabenh. Alg. Eur. 2347, 1873. Oogonium 1-3, subpyriform-globose, medianly plicate, with 12-17 longitudinal ridges, operculate, division supramedian; oospore sub- depressed- to subpyriform-globose, nearly filling oogonium, spore wall smooth; terminal cell apically obtuse; vegetative cell 7-11 16-65; oogonium 23-28 X 24-29; oospore 21-25 21-25n. India. To be compared with Oe. oelandicum (No. 164), Oe. mega- porum (No. 165), and Oe. crenulatum (No. 233). 230. Oc. lagerstedtii Wittrock. (Pl. LVI, figs. 536-538. ) 1874, p. 38; Hirn 1900, p. 311, Pl. XLVII, fig. 306. Oogonium 1-4, depressed-obovoid, medianly plicate, with 7-11 longitudinal ridges, operculate, division inframedian; oospore depressed- globose or subglobose, not filling oogonium, spore wall smooth; vege- tative cell 5-8X10—-48u; oogonium 16-23 13-17y; oospore 13-16X 11—14uy. Finland, Sweden. Cf. Oe. platygynum (No. 167). 231. Oe. uleanum Hirn. (Pl. LV, fig. 529.) | 1900, p. 311, Pl. XLVIII, fig. 308; Oe. sp. Moebius 1895, p. 174, Pl. 2, figs. 11 and 12. Oogonium 1-2, subpyriform, medianly plicate, with 7-9 longitudinal . ridges, operculate, division inframedian; oospore globose or subglobose, not filling oogonium, spore wall smooth; vegetative cell 8-10 40-80y; oogonium 23-29 X 24-39; oospore 18-22 18—25uy. Brazil. Cf. Oe. platygynum (No. 167) and Oe. lagerstedtii above. 232. Oe. pulchrum Nordstedt and Hirn. (Pl. LVI, fig. 541.) In Hirn 1900, p. 312, Pl. XLVIII, fig. 309. (?) Dioecious-nannandrous; oogonium 1, depressed-pyriform, med- ianly plicate, with 7-10 longitudinal ridges, operculate, division infra- median; oospore globose or subglobose, not filling oogonium, spore wall smooth; (?) androsporangium 1-4, subepigynous or subhypogynous or rarely hypogynous; vegetative cell capitellate; terminal cell (often an oogonium) apically obtuse, vegetative cell 6-9 X 20-52u; suffultory cell 9-12 15-36y;. oogonitum 23-26 19-264; oospore 18-23 X 16-22); (?) androsporangium 7-8 X 7-8. Brazil. Cf. Oe. bahusiense (No. 166) and Oe. platygynum (No. 167). OEDOGONIUM Let 233. Oe. crenulatum Wittrock. (Pl. LVI, figs. 532 and 533.) 1876, p. 49, Pl. 18, figs. 25-27; Hirn 1900, p. 309, Pl. XLVII, fig. 294. Oogonium 1, broadly pyriform-globose or transversely ellipsoid, medianly plicate, with about 13 longitudinal ridges, operculate, division median, narrow but distinct; oospore depressed-globose, inflating oogonium, spore wall smooth; vegetative cell 6-8 X30—55u; oogonium 25-27 X 26-28; oospore 22-23 X 15-17. Italy. 233a. Var. gracilius (Nordstedt) Hirn. (Pl. LVI, fig. 534.) 1900, p. 309, Pl. XLVII, fig. 295; Oe. crenulatum Wittr. f. gracilior Nordst. 1888, p. 12. Smaller; vegetative cell 4-5x 1340p; oogonium 16-18 X 16-21; oospore 15-16 X 12-138u. New Zealand. Cf. Oe. plicatulum (No. 229), from which it is distinguished by its median position of the operculum. 234. Oc. saxatile Hansgirg. 1901, p. 1; Hirn 1906, p. 20. In 1888 Hansgirg described Oe. rufescens var. saxatile as having an orange-red color and with these dimensions: vege- tative cell 7—-9(-12) X15—70u; oogonium 18-24 24-36u. MHirn (1900) considered this as a synonym of Oe. rufescens (No. 4). In 1901 Hansgirg, apparently feeling the variety to be distinct, gave it specific rank as Oe. saxatile, adding nothing to its descrip- tion. It was found in several localities in Austria in a vegetative state on moist rock. Oe. saxatile may be distinct, but its description is at present too incomplete to warrant its retention as a distinct species, except as a matter of record. Vegetative cells red in color have been noted in a very few species of Bulbochaete, e. g., B. sanguinea (No. 50). 235. Oe. reticulatum West and West. 1902, p. 129; Hirn 1906, p. 19. Vegetative cell elongate; oogonium ovoid-globose; oospore globose, not filling oogonium, spore wall areolate; vegetative cell 7-8 X62-100y; oogonium 37 X41; oospore 25 X 25u. Ceylon. To be compared with Oe. arcyosporum (No. 58) and Oe. areolatum (No. 59). 1 THE OEFEDOGONIAGCEASB 236. Oe. reinschii Roy. (Pl. XLI, fig. 406.) In Cooke 1884, p. 160, Pl. 57, fig. 23; Cymatonema sp. Reinsch 1875, p. xi, P1. 6, fig. 1 (incorrectly Cymatopleura, p. 77); Oe. sterile Hansg. 1888, p. 43 and 260; Hirn 1900, p. 319, Pl. L, fig. 326; Lewis and Taylor 1928, p. 193, text figs. 3 and 4. Vegetative cell subhexagonal or subellipsoid, sometimes nearly cylindrical; basal cell subhemispherical; apical cell obtuse; vegetative cell 6-9 (-11) X8—24u; basal cell 8-9 X 5-6y. United States: Michigan, Florida, New York, Massachu- setts; Brazil, Paraguay; Austria, England, France, Germany, Scotland, Sweden. This species, though as yet never found in fruit, is readily recognized by its peculiar vegetative cells. Among the typically hexagonal and ellispoid cells nearly always can be found regu- larly cylindrical cells. : ABLE OF SYNONYMS iW TABLE III. Alphabetical list of synonyms. The numbers indicate the species of BULBO- CHAETE in the text considered synonymous, or under which they are discussed. If the number is preceded by a question mark, the synonym is considered very doubtful and cannot be definitely authenticated. BULBOCHAETE No. BULBOCHAETE No. Gmomalaeringshs..cccecse se: - 246 PNZMGCE NNAGtiNw sian) rapieie reas 34 brebusson Katetz. f...2....54.- ? 9a pygmaea a. major Pringsh..... 38a GONDWI WiOOGGaAn tannin ese 223 pygmaea b. minor Pringsh..... 34 crenulata Pringsh. v. plena rectangularis Wittr. v. lun- WWAGineee pane tesner tec tiene at 11 ellie Wittig sect oe: 36 crenulata Pringsh. v. supra- rectangularis Wittr. v. tenuis TAG UL MBLC in org ia cud otie the 12 Wittr ee er Se 35 GUMOSAaWOOdE ERE tess: 38a rectangularis Wittr. v. nor- elachistandria Wittr........... pl DE SUE Ga Willie + + crete ec ee 35 elachistandria Wittr........... 214 reliculata NOrdst..t.scss5.6 46a ellapsospora West............. 227 reticulata Nordst. v. minor ATE UUOS IPRS OG gee oo Bo Dede Oe 6b I Percale cerelececine Rec eaene tact 38a TINOTOANVOO GEE A terse ad oe ee 237 MHGUUNHOS POKG Wa tu temeneel se ae 236 CTAGLALTGA CATIA) Gr 35243) 6 ee 20 SAHUGIAL! INGE EN Nan ooo cee co0e0ur 23 intermedia DeBary f. ameri- setigera (Roth) Agardh........ Pill cana Hirn.. Bae ih ly setigera v. canbyit Wood.......| ?28 intermedia DeBary f. " supra- setigera (Roth) Agardh Vv. mediana (Wittr.) Hirn....... 12 punctulata Nordst.. aoeel|, ead intermedia DeBary v. depressa CAAOUONT Watts ap optical Ce Ob & 46 NOME cotati Gis eee eee 12a SMU SUTLPLEX Wilt Gi eee age eke 38a IALLILO Ta NUE Tas eee ae she eal 4la tenuis (Wittr.) Hirn v. nor- MINOTANIMB Re eee een) aE vegica (Wittr.) Hirn......... 35 mirabilis Wittr. v. lapponica Lind Witte ene cele ite oe 9 Wiittrs andeltndie) eee: 6 varians Wittr. v. antiqua mirabilis Wittr. v. tmmersa Nord site, Ucmracnicts c. oda 40a Waitruty anne meen em aoe. 6a varians Wittr. v. alpina Wittr. TYG TY NTS 71 MARC al RCo aca an veel: Ubi ae hie 32 A ae At keg 38a nana Wittr. v. subbasispora es WVU steeqee ts tee ere ae ee 1 : pachyderma Reinsch...........| ?46 COSPERYS pringsheimiana Archer......... 246 SCLICCTOMNOU OP eer eer 23 174 TALE OE DO CONT AG EA TABLE IV. Alphabetical list of synonyms for the genus OEDOGONIUM. The numbers indicate the species or varieties in the text considered synonymous, or under which | they are discussed. If the number is preceded by a question mark, the synonym is considered very doubtful and cannot be definitely authenticated. OEDOGONIUM No. OEDOGONIUM No. acrosporum f. connectens Wittr.| 195 crispum v. wruguayense f. pro- acrosporum v. boreale Wolle...| 195a eats awa s aot oa. 109e ajricanumlagerhnssn.- oe se. 200 crispum f. vernale (Hass. alicrwuans Karel. ua oS Se 113 Writ tr.) Elan: 28 sare oer 109 amplum Magn. and Wille...... 49a cryptoporumy.vulgaret. abbrev- angulosum TWallas.............- 135a TUG GL GWe Perna hee ois eee 169 MpiculatinWOller: oases =: Be tay cryptoporum v. subdepressum apophysatum Al. Br. ........-- 138 Witt Gigs eek eines ie cepa Taree 169 apophysatum Al. Br........... 150 cyathigerum v. ornatum Wittr..| 149b apophysatum Al. Br.......... 151 cyathigerum v. rumelica Istan..| 149 apophysatum Pringsh...>...... 151 debaryanum Chmiel........... o7a archerianum Cooke...:........| -? 53b delicatulum Kuetz........ Soh ye LGSe CREGNANOVEL@aNVAEGE ae . «2 toe 142a diandronites Carter.........s.- 225 areschougit £. major Collins...:| 160b || dtoicum Petroyv.......... oat: 37 bathmidosporum Nordst....... 195b ECMN OUTAGE, oe eee ee a bemmardense Bates....0.cce5.-| ile Chemin TaMlasn eee ee ae 184d berolinense Wittt. 2.22... - 154 Cuganeorim Witbi=.- 6.222 epee 95b DEV MANICINY Wattt. amen. o- 138 CUCU EVE eee eee 4a birmanicum Wittr..........-.- i 2188 (LOnte Hallastee eee ee eee eee OLS DORUSTONIUHE WILLE. Jee nea 138 WLAVESGenS WiAttia. ce ene ere 133 calcareum v. gaditanum Lewin..| 132 flavescens v. gynandrosporum Galosponunn Kirn). jects. 7 eee 57c the to Cae eee 133 candollei (Le Cl.) Breb........ 24 fonticola v. flavescens Hansg...| ?183 RE TAY CTD NGM WA om Ban Joa a Oete 35 gemellipurum Pringsh......... 45a capillare v. flavescens.......... 35 gemelliparum v. majus Wittr... 48 capilliforme v. australe f. grande v. aequatoriale f. hor- TVA AS ela Shean gets 5 agg © a6 ack 37d tense: Wraottr sin. cl. see 45b capilliforme v. australe f. grande. 7ODUSta TAI ere 45d uberosporum Hirn........... 37c grande v. robustum (Hirn) GOROONIGUMINV AGEL Je. ame. see 15c flifianiy: 3 5ccck tke ae ere 45d GUGAVOGIIE WaGtIOR «0... 240+ veond 15 hatniense lalllasy..5.ceee err ae 132a cataractum Wolle..............| 142c Wesa gon KUetZ. 1a see otek 135 Cigarew CINGteess = 2s 3. eae 95b luspanicum Lewin..........::. 109 COMGTUI TAN SS a:.2.. 2 aes 185 hohenackeru Wittr............. 184e cleveanum v. arvensis Istv..... 154 hormosporum West............| 149e cleveanum f. exoticum Hirn.....| 154 huatlense Wests Ace se. eee 118 concatenatum Wittr............ 151 hiiGhinsiae Wattt. sane eee 15la concatenatum £. luxurtans Breb.| 150 INSLEnis W. minus Harn. - 4... 74a concatenatum v. lagenartoides intermedium Kuetz............ 183 1 Sit ee ais ie, ts Otel ERA ee 151 inversum Vv. Subclusum Wittr.. . 77 condensaium Hallas. .5:....... 144a inversum t. subclusum (Wittr.) crassipellitum West........... 142b lelihcatereeis ceare tists hice staonc Oe ChOSSIUIM NOGiT Ae eee oe 49 Riell manu Waitt as renee ee 54 crenulatum £. gracilior Nordst..| 233a Rlebahnit Lemm............... 200 crispulum Wittr. and Nordst..| ~178 lagerherniy WVilctiee rece mer 109¢c crispulum v. minutum Hansg.. 179a landsborought Wittr........... 48 crispum v. elongatum Wittr....| 109 landshorought v. gemelliparum crispum £. gracilis Wittr....... 109e (2ringshe)aWittieseee eee 45a crispum v. granulosum Nordst.| 109a landsboroughiv.robustumWittr. 48a TABLE OF SYNONYMS TABLE IV—(Continued). OEDOGONIUM londinense v. compressum West. longicolle wv. senegalense f. afghanicum Schaarsch....... lorentsit Magn. and Wille..... bundellea With: oe. deck umlens ev Waites ok sak PUMMEN SEW atts iatstne eee see 3 macrandrium v. aemulans Hirn. macrospremum {. patagonicum Boraerancdullinni. vce lsc. maxiniim West: oo. acc we nt: montagnei v. submarinum Wittr montagnet v. saxicolum Wittr.. monticchit Fior.-Mazz......... MCRLE CHICA EL ATI rey. eas rte ieee MOTAStEAvUU WAGED. «av ns se 2 oblongum v. majus Nordst..... obtruncatum v. oblatum Tilden. ochroleucum Kuetz............ oelandicum v. pachydermatosporum Nordst... pachydermatosporum Nordst... POIUCOSMI WTEC. ola ole cls - paludosum (Hass.) Kuetz..... USGA ALITONN RAE He oo aoe ee ee piliferum Auersw............. platygynum £. major West...... polymorphum Wolle........... DrUnGe PS Wilub in sen eae oho. 1 2 pringsheimiana Archer......... pringsheimu v. nordstedtii f. pachydermatosporum (Nordsi=) Elin: = - 55 ass: pringsheimiu v. nordstedtii f. euganeorum (Wittr.) Hirn.. pringsheimu v. varians Nordst. propinquum Wittr.. or punctato-striatum v. minor Witt bir tact gee Ge AerenaN heen pyrulum v. obesum Wittr...... rhodosporum (Welw.) Wittr... i RED RAAB eee Be Ge Oe APIO rivulare v. major Wolle........ rostellatum Pringsh............ rostellatum Pringsh............ ROUNUIASEC DO cee res oeisaheee ooe PODME TANS Me ere. sae ia roti {. major West..%..... <4 rufescens f. exiguum (Elv.) Hirn. rufescens Sue lundellit (Wittr.) Hirn.. ene 175 OEDOGONIUM rufescens subsp. lundellii lig, Ahoy kaon? lathe, eee ooto oe sertosporum Lagerh........... SALAG HE SEND son antosacocdes Spetsbergense Wittr........... SPphaenrcumdelasen ns. ea 4s: spinospermum Reinsch........ spirogranulatum Schm........ SUH RGN, Oo sit eiteongis Bore oF SHORE VW sooo eoenac- stagnale v. variabilis Lewin.... SVEP PICA AMSO: hotel ae ais cers 3 4 subpisanum Lewin..........:: subcapitellatum Hirn.......... tapeinosporum v. angolense Wiest and Wiest. <0. sic ..5 ck WAGKOSPOTWID MUZISS a8 sees. 0 tiandulum Pringsh..).5...... tumidulum (Roth)............. IG EUTUITH NGA 5 5 on a Ae UNUM TEAL Gee een oe undulatumv.interrupte-incisum SehTroedigs ae. .ta< oe Oe ee: undulatum v. moebuisit Schmid. undulatum v. senegalense urbicum v. oviforme Lewin..... DOUCHE ETON a. . sale eee. vaucheru Al. Br.; Wittr. f. paling? lelin ge ances oe oo akoe UCINGLEaNNialtauier ieee eee aoe VA BOE NYMIBE, bo ofb on Bae bo db. UCSUGCILLETTE: le inka neyer eet tere Desicaiilmn Vink nes yee a: vesicatum Wittr........ ras fae vesicatum v. flavescens Kuetz... vesicatum v. fuscescens Dupray. Wittrockianun Hanis... 2.2... 28. wolleanum v. msigne Nordst... ANDROGYNIA MUS Dora NNOOG. «e502. eee CONFERVA capillare L.. aR OSE tumidula Eng. Bote ee ass undulata Breb ree 176 THE OEDOGONIACEAE TABLE IV—(Continued). CYMATONEMA No. confervaceum Kuetz........... 119 PRINGSHEIMIA No. inaequalis Wood.............. 2-15 PROLIFERA No. boraszanasise Clos. econo 138 ROSCIMICHE re 22s nee ae 2 oS TEDL ATES UC Clee. os dence ? 42 FOTO, hoe. 3 ee be L69 vaucherit We GL. so. 2... : beeen: ? 25 VESICULIFERA capillaris{ilass= fe ee eee €ardvaca- Hasse eee ciliata WaASS Ake see ee COMPIESSGALGSS hacer Bee ee Concatenaia Hasse eee eee crispa Diassee ee =. eee CYUSSOAELASS chee oe eee flavescens Wass. 2.0 eee aoe landsborought Hass............ POULAOSORHASS ee a eee PTUNCEPS LASS. een eae ee piulchella Wass. eee eee DENMNGIS, LVASS: 2 eects Sete BIBLIOGRAPHY Wes BIBLIOGRAPHY Ackley, Alma B. 1929. New species and varieties of Michigan algae. Trans. Amer. Micros. Soc. 48 (3): 302-309. Pls. XXXV and XXXVI, figs. 1-22. Agardh, C. A. 1817. Synopsis algarum Scandinaviae, adjecta dispositione universali algarum. pp. i-xl; 1-135. Lund. 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Natur- wiss. 13 (2): 50. Taylor, W. R. 1928. Alpine algal vegetation of the mountains of British Columbia. Proc. Acad. Nat. Sci. Philadelphia 80: 45-114. Tiffany, L. H. 1921. New forms of Oedogonium. Ohio Jour. of Sci. 21: 272-275. Pie figs! AqE. . Tiffany, L.H. 1924. A physiological study of growth and reproduction among certain green algae. The Ohio Jour. of Sci. 24 (2):65-100. Tiffany, L. H. 1924. Some new forms of Spirogyra and Oedogonium. Ohio Jour. of Sci. 24: 180-187. Pls. I-III. 20 figs. Tiffany, L. H. 1926. The filamentous algae of northwestern Iowa, with special reference to the Oedogoniaceae. Trans. Amer. Micros. Soc. 45 (2): 69-132. 16 pls. 179 figs. Tiffany, L. H. 1927. New species and varieties of Chlorophyceae. Bot. Gaz. 83 (2): 202-206. Pl. IX, figs. 1-12. Tiffany, L. H. 1928. The algal genus Bulbochaete. Trans. Amer. Micros. Soc. 47 (2): 121-177. Pls. XIV-—XXIII. figs. 1-99. Tiffany, L.H. 1929. A key to the species, varieties, and forms of the algal genus Oedogonium. 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Algae Am. Bor. Exs. Cambridge. Rabenhorst, L. ie Algen Sachsens resp. Europa’s. Dresden. Roumeguere, C. Les Algues fluviales et terrestres de France. Toulouse. Tilden, Josephine E. American Algae. Minneapolis. Wittrock, V. B., and O. Nordstedt. Algae aquae dulcis exs. Upsala and ‘Stockholm. Wittrock, V. B., O. Nordstedt, and G. Lagerheim. Algae aquae dulcis exs. Lund. ND EEX 185 LIND Eee BULBOCHAETE Page Page GAC GOS aL Ext oR ee, ae ta AA a 48 megastoma Wittr. and Lund....... 31 alabamensis Transeau and Brown.. 40 MOEA Bir is oe ate eee 47 angulosa Wittr. and Lund.......... 36 Wie aie Jalihnalns sap ae tho eo 47 iiey ELADS ad ta G0 ne ech eso eae 37 minuta West and West............ 33 QHOMOlLGs Erne Shie sone \ olvt ae cle: 48 OSI OHIS NWVTRGBe visio eo OEb-b 5 vob ho.0 ba 32 f. ammersa (Wittr.) Hirn........ 32 bastspora Wittr. and Lund......... 31 Vv. gracilis (Pringsh.) Hirn...... 32 NO AZHOS NEN Eye Cae eee ae 37 monile Witt. ands Lund. ........-. 30 UV EUTSSONT RUEEZieins ao ssc ee 33 Wo OWMoMslian, waren angawane aso 30 NORM OTANVOLOUs sar astn s aks cae 34 : AZ IMT NNR es Ue ae aa eee eas c 50 EEL | ABBE 2 3 oo oe Ee a a0 Rls ane andl Tuk 47 NMOTASLCHLLT NWitisuiaens en ata th ve one es 30 ; Bal iw carts tes Pa SUOCTEGLONGOWIS == ee eer 37 GOne emer e bint. 20 iter cs oR ce 42 v. minor Woron................. 37 crassa Pringsh.:.................. 41 obliqua: Enders he eas « oe ee 39 Grasswmscula INOTdSt. 0. a20e se 41 pounae! 38 Pee ap ieriny | Ay, wall AY, 4 oljandjoGleyoretcrene ene |S Saas 2 f noi Hea ee, 38 debaryana Wittr. and Lund........ ail punctulata (Nord.) Hirn........... 41 BeUIGULOLON WAGtEY 3.4 42% hae tenes sae 48 pygmaea Pringsh. Wittr........... 43 diamesandria Nordst. and Hirn.... 38 pyrilumleand!.-.'.:. Gomi os). ote oe 43 OS DOTA TUES «Soke. set Rt Cho ere RR rae 40 : Rieapariaien Witte... noo 52. 41 GUGET CLO Watiitgaaers = tere eee 42 GOMMOLINIS BOLeen tan ase ke a 43 TectancularisaWwatit eee eee 45 i 2 5 Vv. hvloenstsNordst:. 3.52 a5)... 40 elachistandria Wahlen eye cae 39 repanaa Wikis eS ee ee 44 PURE AAS oe Strela ese oo =.e he * 32 rhadinospora Wittr..............+- 46 ee pumila Hirn. ois ee ee ele seo cue s 33 ¢ iE antiqua (Nord.) Hirn ae i. | A 46 v. scrobiculata Tiffany.......... 33 Vis ILO QIUS Eluiiiiys se nes | eee 47 uUnVCT CRCOMING ee. vee ac oie oe 34 SOMPUIN COM ATIS Cie ern ene ee 50 ; ; SESSUUS, Witten tees or yo aes 39 PER MLE ME EISSN 2 2 oA slates 38 feglabra Eline, As oes hoe 39 : ; setigera (Roth) Agard............. 40 WOTICOENG TOS Gaus so: 5k oa 50 spirocranulata West and West. .... 49 imperialis Wittr................-. 49 subintermedia Bliv es... 5... S 36 Pui CORGEES WADE ola ce = rite tas 49 Lense (Watit elie one wee erie 43 RSE QNGs EAMES oe 2. Aes iaje He. 3, 48 v. norvegica (Wittr.) Hirn....... 44 v. recticulata (Nord.) Hirn...... 49 ; - a intermedia De Bary ot ee CoS 35 valida ee Vgeplehicns! sf.e<.0)») oss) (e! e's 6m (0) (ale lope he ae rd RCTEET ee ow 235 DONLONSAW luce ee ol eee ioe v. hawatensis Nordst............ 46 LOCOENSUSPW1GUE-2 > 5 ar)stties stot 46 v. subsimplex (Wittr.) Hirn..... 45 OEDOCLADIUM albemarlensis Lewis........... Pe OL SF EO1O We WIS, aaa OER Oe SENG 52 sagen WOWiSs. 20%. ache ee 52 PYOLONCILG SS tally anewer pera on eerie 51 *New species, varieties, and forms or new combinations are indicated by an asterisk. 186 ToE OEFEDOGONTAGE AE OEDOGONIUM Page Page KEMP ION GAS 55005 b00b0b5006 103 concatenatum (Hass.) Wittr....... 136 acrosporium De Banyeerener eos. 157 f. hutchinsie (Wittr.) Hirn......136 i. boreate (Wolle) taimal. 225 so -1. 158 Vin KECLAMEULORENRICH eer ee 137 v. b... nidosporum (Nord.) Hirn.158 GOnfentivn Eine eee ae eeeea eae 141 We MOMUALSE WONG: 5.546 4566 aoe 158 consociatum Collins and Hervey...167 v. majusculum Nordst...........159 Contorii7aLiallases aoe eee 147 APIS AAT HIE MERRIE 45 ol 650 BOO OO Oe 115 costatum Dranseau... 4. se. sees 146 alternans Wittr..and Lund......... 128 GROSS TUS GUILT AistTy sae eee 129 americanum Transeau............. 97 v. arechavalete (Wtr.) Hirn...... 130 angustissimum West and West..... 160 v. idioandros porum Nor. & Wittr.130 Gnomalumebinnieee. fe. so... 6s eo sss 83 *v. cataractum (Wolle) Tiff....... 130 arcyosporum Nord. and Hirn...... 94 GOSS ASS») MVWaltiitae eee 88 GHC OLMIUTUIU ARETE e)58 cle\s eres are - 94 f. amplum (M. and W.) Hirn.... 88 CROSGHOMCLUNVAIL GIR oe isso ele: 140 Va LONG AbrAanSCall-ercemee rete 88 v. americanum Tiffany.......... 141 Vis Sh Hine Webhadly a6 554050556 88 Ig ODMISIWTD Jabhtnlge agg pace aoe 141 crenulatocostatum Wittr........... 92 CRECHLCIMIMGlG erate. «oe « tae s' ore “1 96 lig QM MUPUCRUTE abbot. 553500050060 93 mien eneehnucumese: Midhaniy:. oes). 97 Wo CHiAahie INUGKESON Bosco koa e006 93 QHINVCCIUTAANGIe ees ces oes 133 v. longiarticulatum Hansg....... 93 AUSLCI EWAN sic esne: sects, «Ps ecerei oe bs 120 Grenilanin Witte een ere eneeer 171 GUStTOLOMWye ITM. .....0..+-ses0+s< 99 v. gracilius (Nordst.) Hirn Pet eene 171 MUU IOLE Witt. 1122.2 ss cine a = 112 craspum (Hass.) Wattre> ene. cae 113 bahusiense Nordst............ 20-0. 142 : Ae ea decease bengalense Hirn............++++++. 139 Vi. Practlescens Witte. .10-2 ett 114 biforme Nordst...........+++++++. 83 Va hawavense Nordsts «tana 114 bohemicum Hirn.............-+++- 105 v. uruguayense Magnus: & Wille. .114 boreale Hirn........ els 9 ei en a 147 CLV PtO POV UMW Iti. tk le ie ee ae 65 borisianum (Le Cl.) Wittr......... 128 Vv. vulgare Wittr....0i0.0. 006+: 66 v. westit Tiffany and Brown..... 128 curtum Wittr. and Lund........... 74 boscit (Le Cl.) Wittr..........---- 91 CUPUUMERTNSSH 2. sao cee a. eee 65 f. dispar Hirn..........-....++. 91 Gyathogerum: Wittt os .ee chee 133 v. notabile Lemm..........----- 92 f. americanum Wolle...... eR te 134 v. occidentale Hirn..........-.-- 92 f. t, aatum (Wittr.) Hirn........ 134. brastlvense BOrge. i... -j.2- s\n tie 140 f. perfectum Hirn............... 134 braunit Kuetz.; Pringsh........... 125 v. ellipticum Magn. and Wille. . .134 v. hafniense (Hallas) Hirn....... 125 v. hormosporum (West) Hirn....135 Vv. zehnert Tiffany AUCOmMOD ODODE tO 125 cymatosporum Wittr. & Nordstpuan 67 Galcareum Cleviel. o. 0. +0 . see eee 67 ; Caleta. cs 6 ance ee 169 danicum allash ae eeeee 145 capense Nordst and Hirn.......... 166 decipiens Wittr.................-. 145 captllare (L.) Kuetz.. _.. 80 f. dissimile Hirn.........-...... 145 fe? stagnale (Ketz.; Watt ) Sethaay 80 V. africanum Tiffany. OS cna Or 145 capilliforme Kuetz.; Watitrennc. see 81 v. bernardense (Bates) Hirn..... 146 f. debaryanum (Chmiel.) Hirn.... 81 depressum Pringsh........-+.++--: 124 f. lorentzii (M. and W.) Hirn.... 81 dictyosporum Wittr.........5.-.-. 94 Vv. ausivale Watttie....... +22... 82 f. west Vitlany ........7.--.>. 94 v. diversum (Hirn) Tiffany...... 82 dtoicum Carter. ....-..---.---++>- 107 capitellatum Wittr................ 104 donnellu Wolle; Hirn. See ee ae 132 cardiacum (Hass.) Wittr.......... 70 v. wittrockianum Hirn........... 132 lig COAOJAGLIITE WaUNEas . coda nnoceoe 71 f. pulchellum (Hass.) Hirn...... 71 echinatum (Wood) Wittr.......... 133 Vi COU ONUCUIT WValttine mete yee ere 71 echinospermum Al. Br............. 121 Wo os WASiaahidl vances ooanne 2606 71 Vie ROMRLCILIT ELInie ne eect 122 ciliatum (Hass.)) Pringsh= =. ..--.- 153 elegans West and West............ 138 Clann p NEMENS. 5 5 cGnocnesbod6o- 141 excisum Wittr. and Lund.......... 100 GIEUCONU Wit bee eee eee 138 EXOCOS OUT A AhAMIYs, cst epee cramer 89 ity GAOUICDNTD labbGM, co sogdnaqdoosb56 138 exospirale Tiffany ....:....-).-«:- 122 INDEX LS7 Page Page PROUMES ILE, EXITING O80 sips ee ve AS tls 83 Rielimaniw Wittresilinne 44> es chre 89 v. columbianum G. S. West...... 84 URSA CULET: Sy. ctw teeny he ae 79 v. maximum (West) Hirn....... 83 is ; : v. punctatum Lemm............. 84 aes Wittr............-- 200: io qlapescens i(Hass.) Wittr....)...2... 125 Bee RUE ate ha caer ON auras z i ares : Lagentonnie selitiile: ere eer ict 168 MIORUMOSUMUEIITINGE 226 1-750 Sidre loss gene 163 fester ied Wate 170 fonticola Al Braune 4. ./5......-. 163 lana res is hi (Ha 5) Witteae.. 87 PGNEOLULMOW ities ee os. ska 95 BLES ORO Et Wit BHM ag i 2 87 MRA CMeMWEtE Mtn cess ea ee 75 ae WES oan c og oo : ie V. abyssimicum Hitmn...........-- 5 abuUscuilim LIMADY 2-22. ee : *y. robustum (West) Tiffany 75 lautumniarum Wittr............--- 12 franklinianum Wie 71 leiopleurum Nordst. and Hirn..... 91 fusus Fenias cy 7 eee ree 162 lindmanianum Wittr..............- 133 oid RSE PRN bane Bet Londinense) WAGUE ae. 4:00. soe ee 167 eENESGIE TPE) LATIN scale tye, 0 «oie! coog, oy! oes 124 NOPROONTE ISBNs oesepacrcseooonsn. 148 BUNIGUICIIINT FAITE oe cra. t ae 6 ars10 «e 78 lomencojle Nordste-....sc00,. 45 0. 144 giganteum Kuetz.; Wittr.......... 165 v. senegalense Nordst...........144 UNA TD aOR 5 oo cede COO D OC Orc U2 opiciipie \elivaa. 5506 qcduade onan oF iH plobesum INOTdSt. 23/5. 2s cesses nares 74 ; 5 gracillimum Wittr. and Lund...... 116 Te a Peas ae ia f. majus West and West......... 116 4 hae TRG ce ta Phage (TUNE IGOUAS VME, ode ob ape D Ow 85 mate ane : ) Teak ee fee f. gemelliparum (Pringsh.) Hirn.. 85 Pace nen et Witt ) Hi 3a 152 v. aequatoriale Wittr............ 85 v. propinquum (Wittr.) Hirn. .. 19 . v. hohenackerti (Wittr.) Tiffany .152 Wee SUD Walbeals eae gobo d sont 86 : v. majus Hansg " 96 v. scrobiculatum Ackley........- 152 ES a Os ES eee = A ec Aa macrospermum West and West..... 146 GUNMA NNR UE a. aes fee Ait estan ches 110 aera ; ; MARR USUA WLC Lie is. dege s,s «in sree 68 ma pee ane lplbiials GBrmoarec ee mammiferum Wittr.; Nordst....... is PORIb ts GU WiSEA 7... ba is owes ee = manschuricum Skvortzow.......--- il 4 ay renee (Gin SHANE Ste cote oe ee Ae margaritiferum Nordst. and Hirn. . ve Hus IPT? IN\OiCBitas ge cn acne opp es oe MLOMEVMUGEISE elects eee paar nee ale OAH ICOA SOV Ay Sano taco I IO 165 MEZA POTUM Walitte. t-te heel te a 142 hoersholmiense ln, ames ota ae 150 WLEXICUNIUL WAGE: ee cee 85 howard G. De WES a ops ota ai-yes: 101 michiganense Tiffany.............- 157 v. minus Tiffany............-.- 102 THELESS MN ROHEE. bbls culbidiaeo ado ohne oo 103 huniu Wood........-.... eae 137 mirandrium Skuja...........-.+++- 147 hystricinum Trans. and Tiffany y. .120 MALTON ELC eyy =< a ateneye a= 2 Oe 105 hystrix VTi pig peas ee ett a ee 120 monile Berk. & Harv.; Wittr...... 154. v. canadense Tiffany............ 121 fy Dorcet Elim ns... seat ooo a: 154 v. subglobosum Wittr........... 121 v. eminens Hirn........:...----- 154 ee fevrGloriense Gur sa WIESte dae or 154 ee aaa nee 2 ae a ie MOniliforme Wittl. 22... 6... 20. 166 igs kere PU oe Oe Cec ia ies 169 montagnei Fiorini-Mazzanti; Wittr.162 ee fie Fed BEES cet tvetiae 160 multisporum Wood..........+++++- 131 ae aan ea 5 150, ep eee ec ame igh ke rd DECREE ED, 5a Spe hla. gee Sees 166 nonum Wittr.; Tiffany ...........!: 109 Vin PLCMELCTUS TATTMA eee oly setae atc 166 nebraskense Ohashi.........-.+--- 119 UIILIN IID MUL AGU, apes teveiols dors eyes sere 101 mobile Wittr.......-+..2.5+.++00:- 99 TTA dS EWN Ve) Sea 168 We Gouuns lablingls Soa eogaceactet one 100 WESULCO Antico k ee Oeeeen epee weer cree 100 nodulosum Wittr............--+++. 108 IMLCTANCULUIT WIbtl. 204 ss. -0s oe 72 Wg COMMING Nalibotls pgoconocaase5® 108 Wie pemnicin Vittany...o. 2. 2.405. 73 : : inverse WAGE >.> ec bes coee 100 obesum (Wittr.) Hirn...........-. 12 WRMOMSE VA ANIY cae. YE Aol snct oe es 106 oblongellum Kirch...........----- 116 srregulare Wittr. ..0. 02-0. tfnasts. 131 oblongum Wittr........ we corn 2.8 lajovn.0 x te v. condensatum (Hallas) Hirn....132 f. majus (Nordst.) Hirn......... itzt ‘a ; f. sphaericum (Hallas) Hirn..... 117 iizvgsonni De Bary....7-.. =..." - 117 > E 86 f. heteromorphum Hirn.......... 118 oboviforme Wittr.........-..-+-+-- eae Act abso Ah bs 118 GOSOLELILITY WHltien ee reach ot eer i: 69 et Ga ia obtruncatum Wittr...............-155 kirchnert Wittr...... Ren er Mertect oi 116 v. completum Harn............-- 155 Ritute GaS. West.........aM...... 129 v. ellipsoideum Wittr..........- 155 188 THE OEDOGONTACE A E oelandicum Wittr.; Hirn......... i BOs JBOTEC..0> «slg eee ORVZC WAGES ci 3.5 era eee v. seriosporum (Lager.) Hirn.... oviforme (Lewin) Hirn........... DACGhVAnariiL Wachter ee eae oe pachydermum Wittr. and Lund.... paludosum (Hass.) Wittr......... v. americanum Nordst......... v. parvisporum Hitn........... paucocostatum Transeau.......... Vin ALooilos WNibtIBRIN, 5 ala bado mc paulense Nordst. and Hirn....... (DOP SPUCVIITE WBGEEDS 551500000805 2080 e YEA ALBAN FILLE as srt. ch onc ICRC PORTE NCR PILOSPOMUMAWICSitr tte aoa) she oie) o le PESO DONTE \UGIEICS 5 55 65 BeOS oa eOOn v. gracilis Trans. and Tiffany... PUG PHONE IW Ubi. 2... sem. cs o 2. plagiostomum Wittr.........+:... VARCTILGDIDUSMNVUGGIo,. «26 se s)as sei DIG UNUNEAWHIEG se. . «ss oe cele its OnimisHiip lathes Ssaeigne goo ad oe v. continuum Nordst........... VWaiovemelandie Earn)... 1. 4 .see DITGainilanO Witt... ..+- 1s. a2 see Plusvosporumm Wattt.......-..+.-5 Piuae INOTASt...05-.4-- 0s. -eee poecilosporum Nordst. and Hirn... borrectum Nordst. and Hirn....... PrGteWse ATramSCAUs v.46. ~ ool praticolum Transeau............. princeps (Hass.) Wittr........... pringsheimu Cramer; Wittr...... VEN QUONCUIGLUM HlIiniee oe... ele VieMILONUSLCULVY Wilt bTy. ee )2.. 2 seins psaegmatosporum Nordst......... pseudacrosporum Wittr........... PSCUCOUOS GIO KAI meet): <1: 2). eee pulchrum Nordst. and Hirn...... punctatostriatum De Bary........ DUNGLOTUVUNVAGL Ie ere cei). eee PIGS 1 SUNESS Ueto, 8 apa Baio: DUSTULUMASRCONET eh: es. 2 sae PMT OTLED NNEC. San Bee abos nondne PM COHIDK LE NEAL EIEN A 65 SRD ee ae A ao Alec Vin OU PITUS abaylOnr . Maen. see ee quadratimatalaseesss.- eee ee REUUSCH UL NNON oe ROA oa este reticulatum West and West...... rhodosporum (Welwitsch) Wittr... fichieraniuny Wemitneery. se) seo... (UO Nelbile ee Soccoksoonedeonoe rrulanen weal.) Ale rae: roth (Le. €l.) Pringsheim....... TUES GENSA VALI > eae eee *v. exiguum (Elfv.) Tiffany..... v. lundelilu (Wittr.) Tiffany.... WWE ULOSHUIMENOLOS Gee ee ere eer 1 f. minutum (Hansg.) Hirn...... fe ROLUN ALT init eee ene Page Mipestre Hitt... .so..0 see ee 114 f. pseudautumnale Hirn.......... 115 sancti thome Wittr. and Cleve..... 161 soxatile Hanssen 171 schmidier Gutwinski.......0......- 148 SCVOOIGUICLILIN WAMU Gis eee eee 95 Sclandie Lalas eee eae 161 semiapertum Nordst. and Hirn....124 SexUn gular © levee ee eee 126 v. angulosum (Hallas) Hirn.....126 Vii MGIUSIW alll Ces see eae eae ee 127 SUMaLIGHI Ela Seen ee ee Dy SUM plexsinn ee Wie one ct ae eee 111 SOGTATEAWiLGET as ee ane ee ee ee eeiere 67 sodiroanum Lagerheim............ 77 Sol; Hires Aes en. Gee eee One 167 Spectabile Winn oi. Pate oer 153 sphaerandrium Wittr. and Lund... .112 Spivale Elim: ie seine © nme cerek ae 123 vi. acuium GS: WeStasee eae ee 123 Wi LALULEW Se ithatayaseesereer ei 123 Spurvum TAirhce ss seca ate eere 164 SOMITE NONE, G5 oA kos ooRecoadb et 127 suboctangulare G. S. West......... 79 SMa aciie Walibnay ss doncnonaoboes Seon SUEGUGLEINU Will bine a eee eee 68 fewcUsinaleG.. S-WiCSita esse tee 68 USP reMmiun Metta riven e retiree ee 156 tapeinosporum Wittr.............. 159 taphrosporum Nordst. and Hirn.... 97 tentoriale Nordst. and Hirn.......157 tenuissumum Wanse ns. ee sees es 160 Hifantt NC klevanae merece oe 95 trvorcum Woronichin +255. eeeees 106 tumidulum (Kuetz.) Wittr......... 99 ByrOliGunmuWittie see ee ae eee ce 70 uleanwin AGTH OA. Pip econ ele eee 170 undulatum (Breb.) Al. Br.; Wittr. .118 v. americanum Transeau........ 119 f. senegalense (Nordst.) Hirn....119 upsalvense Watts --052 eee eae 77 Wo PAOLO PSB, a5 ncicc 6 asee dc 78 UNDG IWaAtti. «oe ee ee 69 urceolatum Nordst. and Hirn...... 167 varaans Wittr. and Lund......:.... 69 vaucherti (Le Cl.) Al. Br.; Wittr... 76 none Jae >. SSS 5ehnescoeoo cs 164 verrucosum talllas..-.-.+s.ss0c. 95 vesicatum (Lyngbye) Wittr........ 162 VIGLOTLENS Ca Gs Sh WieSitae een oe 129 UUNGE DUT CENS Clase erat nee eee oe 164 wavashense Uithaniy: ae ae erect te ee 156 warmingianum Wittr.............. 169 welwitschii West............-----. 106 WOLLeaniunt Wittte a4 eee ieee ee 135 f. insigne (Nordst.) Hirn........ 136 Vil CONGLINILIOME LAuGiN aster 135 wyliet Tiffany...... eon tte oes oo Oi eiecag (ClEVE. 4.5. cei ae eee aoe oe 74 - , - - - 2 { Mok fe PLAT HS. Fs PLATE L. Page Bulbochaete elatior Pringsheim. (Redrawn from Hirn)............... 32 B. elatior f. pumila Hirn. (Redrawn from Hirn)...................... 33 iB. elation vaiscrobiculatal (iitanyven censor ance orn cat eee ear 33 Be crentilataseringsheim-a (Nedrawn tron) Elim) eee eee eee 34 BeintermediaWertBanye yaw. can. ce Ones ce Re eee 35 Baintermedia vad epressaaWtnOCkjs) se ieee ee ee ee 35 Be brebissonii Kenretzimecie (Atiber sel) eres Siete caste eine ete 33 B. furberae Collins. (After Lewis, in Collins 1918a).................. 34 BaminutawWest and: \WestascAntem Genoa VWViCSt) mane iar aig. eer eae ae 190 PEATE al: Page Fig. 10. Bulbochaete borealis Wittrock. (Redrawn from Hirn)............... 37 Bicein se polwanariar© leve,, wath! Oogomias 2.4. cee hes eas oe Be uel 38 Fig. 12. B. polyandria Cleve, with androsporangia. (After Wittrock)........ 38 Fig. 13. B. polyandria f. notabilis Hirn. (Redrawn from Hirn)............... 38 Fig. 14. B. angulosa Wittrock and Lundell. (Redrawn from Hirn)........... 36 Fig. 15. B.subintermedia Elfving. (Redrawn from Hirn).................... 36 Fig. 16. B. diamesandria Nordstedt and Hirn. (Redrawn from Hirn)........ 38 Biel /e aro MOnd steatiinWiLLTOCle. re Glo. Ss 22 Ovleb ood asa nd weRinae ee ndee 37 nie. 18, Bb. nordstedtit. suberectavCollans, . ...5....25 2. alate es os wee oe nee 37 191 PLAGE Ta: Fig. 19. Bulbochaete sessilis Wittrock. (Redrawn from Hirn)............... 39 Hise 205 -B-ssessilisii, clabraHim. (Redrawnitrom: lian) ose ee ae 39 Fig. 21. B. elachistandria Wittrock. (Redrawn from Pringsheim)............ 39 Bige 225 /Bagquadrataywitinock., ((Redrawn) iromipiinn)e. sees ele ee ee 42 Rist 235 eB dispar wattrock<. ((Redrawn' from) Elirn)eaeee Geena ae 40 Figs. 24 and 25. B. dispar v. ripartiana Wittrock. (After Hirn).............. 41 Bis. 205 Be obliquavizundelll ss (AtiGer Elim) pes. a neer eeeaee eee ee 39 PLATE IV. Page Fig. 27. Bulbochaete valida Wittrock. (Redrawn from Hirn)................. 42 Fig. 28. B.crassiuscula Nordstedt, with androsporangia. (After Nordstedt).. 41 Fig. 29. B. crassiuscula Nordstedt, with oogonia. (After Hirn)............. 41 Bis. 30) 8B. pyrulum Lundell?” (Redrawn from, Him)... cae eens tee 43 Fig. 31. B. punctulata (Nordstedt) Hirn. (After Nordstedt)................- 41 Riva! et CLASSAS Pines eMiiMens ere ence eye rok otasin che = Mao sea cre Mee son ee 4] 193 PLATE V. Higsessandinl seep ll bochaetelcongenen Elirms sy) eerie a eee 42 igs es) ancdobsbwoipanteasbringsheiml an somre eee eet rere ie: 38 Rigel. ob asetigeran (kota) eX carcino) seer oe) ee ae eee eer eee 40 HigetaS. - Bs alabamensis transeauiand Browtls.55 4 44) eee eee ee 40 194 ————E— Figs. 39 and 1. PLATE VI. 40. Bulbochaete doliiformis Borge. rere ees =: Sy OID CAs EAI NEA ea feet 53.02 bi Doce A Dai see Wal Se oem eiRoaaae = Rig. 42. B. horrida: Nordstedt:, «(Redrawn fromyHirn) .. ..24.-.-saa- sse--so< 50 Ei oAS Soe LECLANS ALIS WWhlGbEOGKe me ayes ces cist keiel pers Go. caste evecare erties or o1alebes = 45 Fig. 44. B. rectangularis v. hiloensis Nordstedt. (After Hirn)............... 45 Bis. 45. B. anomala Prinesheim. (After Pringsheim)....2e..+-«225-.-20+- 48 Hie 46; JB; lasoensis Wittrock. ((Redrawn from), Hirn)):5 soe ace senc os sie - 46 ira eee LCDAN GALLE EOC Kemet op lecee rach eae eiouck x, Sete vsuey a eae ap hecsrcbents Ie = 44 Biter AS eee ye Vahl ATS Vil te ROC Kee ie nL PENPae Ss, lor ceeea MOE ers. otayaenena co «Peters 45 Bigs 49") Bs vatians: vy. subsmaplex (Wittrock) Him. 27. 2.2.0: «> sites see eee 45 Hiee50) ob. Varians) va nawalensis Nonrdstedti... ssc cass cis nia vate oon aeaaeeen 46 Fig. 51. 3B. denticulata Wittrock. (Redrawn from Hirn)..................... 48 195 PLATE VII. Figs. 52 and 538. Bulbochaete bullardi Transeau and Tiffany.................. 47 Pict4:. > Bminor Alyeb raunWatttOCls.» \5.°. onc: 5s «ae eee neta ce ee 47 Pigs 55, .Baminorsygesmanica Harn. “(After Himn)e eer ae ee eee 47 Fig: 56., “Bi breyitultasWattrock:. (Redrawn from Hirn)e sea (2. ee Figs. 57 and 58. B. spirogranulata West and West. (Redrawn from G. S. West) 49 Fic. 59. B. tenuis (Wittrock) arn \(Redrawn fromHim)),. © gee Fig. 60. B. tenuis v. norvegica (Wittrock) Hirn. (Redrawn from Hirn)...... 44 Fig: 61. “Biafinis Hiroe o(Rhedrawn from Him): 9.) 2) eee ee eee ee 48 196 PEATE ViIr- Z ESR as SS Saeeers= a Tireqdy Page BHies62)) (Bulbochaeteinsignis| Pringsheim:: 2 5.04. secs os eck see eh eis 48 Fig. 63. B. insignis v. reticulata (Nordstedt) Hirn. (After Hirn)............. 49 Bie.64.) 5. imperialis Wittrock.) (Redrawn from Firm)... .4.22...-5-55--2-: 49 Fig. 65. B.imperialis v. regalis Wittrock. (Redrawn from Hirn)............ 49 Hiss 065 eb Lnadinospora Wiattrocken. (Atte Elite .o..cr ae eeu eeiieckens ar 46 Fig. 67. B. rhadinospora f. antiqua (Nordstedt) Hirn. (After Hirn)........... 46 Bie--bs. Birhadinosporatyv. litoralis Him. .. (After Hirn) 500i os 3. nes Jes 2 ee 47 197 PLATE IX. BEoawon Fig. 69. Bulbochaete mirabilis Wittrock. (Redrawn from Hirn)... Fig. 70. B. mirabilis f. immersa (Wittrock) Hirn. (Redrawn from Hirn)..... 32 Fig. 71. B. mirabilis v. gracilis (Pringsheim) Hirn. (Redrawn from Hirn).... 32 Fig. 72. B.monile Wittrock and Lundell. (Redrawn from Hirn)..,.......... 30 Fie. 73. B: monile vy. robusta Him. (Redrawmn from Hirm)) ee 3... 0 Fig: 74: B. basisporaWistrock and Lundell. cn. .cos eee eee een ante 31 Fig. 75. Bi '‘nana Wittrock. (kedrawn trom: Hirn) (nc. saae ues |e ees 30 Fig. 76. B.megastoma Wittrock and Lyndell. (AfiterawWattrocls) 11. ae eee 31 Fig. 77. B. debaryana Wittrock and Lundell. (Redrawn from Hirn).......... 31 198 PLATE X. Avy SO MICRONS Figs. 78-83. Germination of oospore of B. elachistandria Wittrock. (After Pringsheim) Figs. 84-92. Development and germination of zoospores of B. varians Wittrock v. subsimplex (Wittrock) Hirn. Figs. 93-98. Development of bristle and first cell division of a germinated zoospore of B. setigera (Roth) Agardh. (After Pringsheim). Fig. 99. A young plant of B. setigera (Roth) Agardh showing manner of branching: a, Primary filament developed from zoospore. b, Branch of the first order. c, d, e, Branches of the second, third, and fourth order, respectively. (Modified from Pringsheim). 199 PLATE XI. 110 111 5SOMICRONS | 107 Page HigslOOm Oedoconiumilacves Witt...) . dec. pile ae eee oe Oto ee ee 65 Fig. 101. Oc. cryptoporum Wittr..... ee a onc nig uiticia Mei nuenins aos A 65 Fig. 102. Oc. cryptoporum v. vulgare Wittr. (Redrawn from Hirn)........... 66 Basse 103 andiO04aOeacunvumyPcingsht ass) ee eee eee eee 65 Pigsedl05:) \Oexrufescens Watt.) (Redrawn tromubtinn) see eee ere eae 66 Bice 1065 (Oehnufescenssyzpexiouiml (PE live)paiiiany 9) ee eee eee ere eee 66 Fig. 107. Oe. rufescens v. lundellii (Wittr.) Tiffany. (Redrawn from Hirn).. 66 Biss 108 Oc. calcareuml@leves “((kedrawm trom Elinn) ee. ese see ee eee 67 Biss 1098 WOex sociale! Witiree(Nedratwaneirorm:) Elin) eee aes serene cere 67 Bice 1105 sOesanerme Eitcanes (Nedrawnieomaleiincn!) eee ee a eee eae 166 Fig. 111. Oe. inerme v. mentiens Hirn. (Redrawn from Hirn)............... 166 200 PLATE XII. | 5O MICRONS | Page Figs. 112 and 113. Oedogonium cymatosporum Wittr. and Nordst. (Redrawn (Gtonaat Healing) . Oexmaonusin Wattre ((kedrawnitromi Jeli) oe. ict cise ee ee 68 Boon Ga OCS SUCCICUIMMVWAIG bina ten 0. 5% Bel ore i iae os es Epic ees 68 Fig. 117. Oe. suecicum f. australe G. S. West. (Redrawn from West)....... 68 Figs. 118 and 119. Oe. urbicum Wittr. (Redrawn from Pringsheim)........ 69 Bical Z0 nO ezvarianse Wit timeline uly Ute We. estes = Sirs. Sum Sistetas ciaveuc: =sucleiniaistenseastialené 69 Rica Oesobsoletum Witte —Gkednamimn trom: Elimn)ene.- 6. 2. eee dee 69 Fig. 122. Oe. plusiosporum Wittr. (Redrawn from Him).................... 70 lines, UPB. KOGA n Ra) WVerTnTe Wine Geee a . One el cio gantin cer aes Hears cial oo Eee TIA 3 otro ole cine 70 PLATE XIII. 129 Page Figs. 124 and wo Oedogonium cardiacum (Hass.) Wittr. (Redrawn from IE L:ieti}) Me hoe ee Asch oie Sake ae ein ee ohn lal PRO Ene Cee ieeers 70 Fig. 126. Oe. cardiacum f. pulchellum (Hass.) Hirn. (Redrawn from Hirn).. 71 Fig. 127. Oe. cardiacum f. interjectum Hirn. (Redrawn from Hirn).......... 71 Bic. 1285 'Oencacdiacumey, carbonicum Wittt....-.0- s4ee eee oreear al Bien 1295 (Oencardiacumavesminius) IZeminuepe ey: eee oe ae er eee or 71 Fig. 130: Oc. glabrum Hallas: (Redrawn from Hallas): 377.222: sae 2h as 72 Pigs i3t: Oexfranklinianum)Wittr.n].- sac osetia Cee ae aire aioe Net 71 202 PLATE XIV. 140 142 | SOMICRONS Page Figs. 132 and 133. Oedogonium lautumniarum Wittr. (Redrawn from Hirn).. 72 Bigmls4e ae © Caintermeai lim Waitin se ot miskat aie 3% sisson olsbese stwienecachscaramts » spoktels 72 Biceslan se Oceintermediim yy tennicumdniianye «come eeeeiae nes 42 eee 73 Fig. 136. Oc. hirnii Gutw. (Redrawn from W. and G. S. West).............. 73 Bigs ls7. Oc. hirnit Gutw.” (Redrawn from Gutwinskt) 0... 5... .2e ee con 73 Bieeel so Oe whitniinve airicanUn Gonos WES basa coe seuic so oes poeta oe Ome 73 Bice 139. (Oc. globosum Nordst. (Redrawn from Him) 2). soy... saieem ee. eh 74 Fig. 140. Oe. plagiostomum Wittr. (Redrawn from Hirn).................... 80 Bigs: 141 and 142." Oe plagiostomum v. gracilius Wittr.........2.-.......--+% 81 203 PLATE XV. Figs. 143 and 144. Oedogonium zigzag Cleve. Big. 1452, s@ermrapilewwiittr. 0 5... 5 jueves ae bide ck ae tie Teena ee Fig. 146. Oe. fragile v. robustum (W. and W.) Tiffany. NVIGSIC) eerie eet, Bes so, «ahs cla a renin « Ue Renee oe Fig. 147. Oe. fragile v. abyssinicum Hirn. (Redrawn from Lelio) een aay caees ths) Fig. 148. Oe. warmingianum Wittr. (Redrawn from Hirn)...................169 Fig. 149. Oe. curtum Wittr. and Lund. (Redrawn from lim) ia Sepckein ee 74 Figs. 150 and 151." ‘Oefvaucherii (Le'Cl.) A. Br? Witte). 2. GG 204 PLATE XVI. 152 | 50 microns | 156 | SLELECHAY, Page His. 1525) Oedogonium oviforme.(Wewin) Flt. os 5 achieve 02k doe eo mdeaib oe ox 78 igs oorandlo4a Oe, Sodinoanumylacerhwe ran 55s sons Aa. a eee 77 Biceivoes Gea Seniculalam Mutts cic. picts caress Reha hai Osco 0s 3 Ss ek 78 Fig. 156. Oc. richterianum Lemm. (Redrawn from Hirn).................... 76 Peal Se Oem PSAlleHSe wk tie goss Sciacca ere ee alos, « hashes cw ws heen hee OU. Fig. 158. Oc. upsaliense v. fennicum Hirn. (Redrawn from Hirn)............ 78 205 PLATE XVII. 159 160 5O MICRONS THEF ANY Fig. 159. Oedogonium martinicense Hirn. (Redrawn from Hirn)............. 79 Fig. 160. Oc. suboctangulare West and West. (Redrawn from West)......... 79 Figs. 161 and 162. Oe. biforme Nordst. (Redrawn from Hirn)............... 83 Pic. 163... Oevkurzit Zellers) (Redrawm fromy Ein)” one ose eee eee eee 79 206 PLATE XVIII. Figs. 164 and 165. Oedogonium.capillare (L.) Kuetz........0..5...-000000e00-: 80 Fig. 166. Oc. capillare f. stagnale (Kuetz.; Wittr.) Hirn. (Redrawn from Ei i. cers teeta ee itn sate als ns s Sees ante 80 Pies.) 16/—169. .Oe.. princeps, (Hass. WW ititieiaece is acts at os Sul. eels ees 82 hisses Orancdyly le Oenanomalumebiicns sem. ees oe a ae ve - ici tre errno 83 207 PLATE XIX. Bigs, l/2iand vo: Oc. capilliforme Kuetz.: Wattrs... 595-2) ooo eee $1 Fig. 174. Oe. capilliforme f. debaryanum (Chmiel.)'Hirn. /7.2..98......../)..2 81 Fig. 175. Oc. capilliforme f. lorentzii (M.& W.) Hirn. (Redrawn from Hirn).. 81 Figs: U/Gand whi, Oexcapilliformely. australe Wittrasss2ss ole eee 82 Fig. 178. Oe. capilliforme v. diversum (Hirn) Tiffany. (Redrawn from Vic bs i) lesen ee ee ram ee meeerpT ee- CA SUA) FOUM Sl ee he oe 82 208 a PLATE XX. L_| 181 | 5O MIcRONns Page Figs. 179 and 180. Oedogonium pachyandrium Wittr. (Redrawn from Hirn).. 84 Figs. 181-183. Oe. subrectum Hirn. (Redrawn from Hirn).................. 87 Figs. 184 and 185. Oc. oboviforme Wittr. (Redrawn from Hirn).............. 86 Fig. 186. Oc. pseudoboscii Hirn. (Redrawn from Silfvenius)................. 76 Fig. 187. Oc. lageniforme Hirn. (Redrawn from Hirn)...................... 168 PLATE XXI. 50 Mic ROWS | Figs. 188 and 189. Oe. mexicanum Wittr. (Redrawn from Hirn) Bigs 190: (Oe oryzae Witt. (Redrawn from Him) etl ee ee Figs. 191 and 192. Oe. oryzae v. seriosporum (Lagerh.) Hirn. itig Oaths B00) Ae i CPR ion NO UL au Re Ge 164 210 PLATE XXII. 5O MICRONS Figs. 195 and 196. Oedogonium- grande Kuetz.; Wittr......................... 85 toa O7eee OC MOTANG EC, MAUS I ansonee eyed, e's oti «wba i# « cies oe eee 86 Figs. 198 and 199. Oe. grande v. angustum Hirn. (Redrawn from Hirn)...... 86 Fig. 200. Oe. grande f. gemelliparum (Pringsh.) Hirn. (Redrawn from NFeAiicera|) iy ewe to ay fils ere once co re ERR RE coe OE: oa i rd ste ORME ware Ue 85 Fig. 201. Oe. grande v. aequatoriale Wittr. (Redrawn from Hirn)............ 85 211 PLATE XXIII. 202 Tier aly 50 MICRONS Figs. 202 and 203. Oedogonium crassum (Hass.) Wittr Figs. 204 and 205. Oe. crassum f. amplum (M. & W.) Hirn. (Redrawn from Flamer) estrone: Cele astsn wes Shon 6 seks, ae ee EEE EE oe 88 Figs. 206 and 207. Oe. crassum v. subtumidum Hirn. (Redrawn from Hirn).. 88 ho i to PLATE XXIV. Fig. 208. QOedogonium crassum v. longum Transeau...................----:-- Figs. 209 and 210. Oe. rivulare (Le Cl.) Al. Br. (Redrawn from Hirn)....... $4 Hiecealieancdest2. Oe. landsborourghin (Hass: eWiattienee. a: 2 .-+ oa 87 Figs. 213 and 214. Oc. landsboroughi v. norvegicum Wittr.................... 87 PLATE XXV. Figs. 215 and 216. Oedogonium fabulosum Hirn. (Redrawn from Hirn)....... 83 Figs. 217 and 218. Oe. fabulosum v. maximum (West) Hirn. (Redrawn 1 tOvoay NARS) ee ee a A Cee eke Wy ba onan Site gio U sc $3 Fig. 219. Oe. fabulosum v. columbianum G. S. West. (Redrawn from West). 84 Fig. 220. Oe. angustissimum West and West. (Redrawn from West)......... 160 (This plate presents a comparison between the largest and smallest species of Oedogonium. ) 214 PLATE XXVI. = (ey ER Sg S5SOMICRONS TIFFANY Page ~ Figs. 221 and 222. Oedogonium leiopleurum Nord. and Hirn. (Redrawn (encima coma ea 423 e Lee e Se OD eS ee eR! Tin 91 Fig. 223. Oe. kjellmanii Wittr.; Hirn. (Redrawn from Hirn)................ 89 Fig. 224. Oe. paulense Nord. and Hirn. (Redrawn from Schmidle).......... 90 Pesos adie. Oe! bosell (uel) Witte... s,s chs a ee 91 Figs. 227 and 228. Oe. boscii v. occidentale Hirn. (Redrawn from Hirn)..... 92 Fig. 229. Oe. boscii v. notabile Lemm. (Redrawn from Hirn)................ 92 Fig. 230. Oc. bosciif. dispar Hirn. (Redrawn from Hirn)................... 91 Rigscol or ee. palidoswar (Elass.) Witte... oss ceo... s.deteed dee eae. 90 5 RT tors © RETIRES a a 90 Fig. 232. Oe. paludosum v. parvisporum Hirn 215 PLATE XXVII. Page Fig. 233. Oedogonium paludosum vy. americanum Nord. (Redrawn from TEN figtnt) eh ae ciate scene sf cs = ay acoveverd ean atte sa.to (RUNGE eRe NST OE Cece 90 Fig. 234. Oe. margaritiferum Nord. and Hirn. (Redrawn from Hirn)......... 92 Figs. 235-237. Oc. exocostatum Tiffany........ Se ee oe acho 4 emo 89 Figs. 238 and 239. Oe. urceolatum Nord. and Hirn. (Redrawn from Hirn).... 167 PLATE XXVIII. 5O MIicRONS Figs. 240 and 241. Oedogonium crenulatocostatum Wittr...................... 92 Figs. 242 and 243. Oe. crenulatocostatum v. longiarticulatum Hansg.......... 93 Bice 244eOe. crenulatocostatuml ft cylingr1 cui bit) da 2 ee ete ae 93 Fig. 245. Oe. crenulatocostatum v. aureum Tilden. (Redrawn from Hirn)... 93 Fig. 246. Oc. dictyosporum Wittr. (Redrawn from Hirn).................... 94 Fig. 247. Oe. arcyosporum Nord. and Hirn. (Redrawn from Hirn)........... 94 Figs. 248-250. Oe. areolatum Lagerh. (Redrawn from Hirn)................. 94 Big. Zot. Wer hochnel Gorze. “Rkedrawn from Borge)... ... 5.00005 222s eens 165 PLATE XXIX. SO MICRONS Page Fig. 252. Oedogonium foveolatum Wittr. (Redrawn from Hirn).............. 95 Rigs\ 2bsrandio4sOewargenteuml rir. 4 0 ace eon eee ere het 96 Figs. 255 and 256. Oc. punctatum Wittr. (Redrawn from Hirn).............. 96 Fig. 257. Oe. capense Nord. and Hirn. (Redrawn from Hirn)................ 166 Figs. 258 and 259. Oe. scrobiculatum Wittr. (Redrawn from Hirn).......... 95 Fig. 260. Oc. giganteum Kuetz.; Wittr. (Redrawn from Hirn)............... 165 PLATE XXX. euerer"e 269 5O MicRows Page Biss. 20L roa Oedoronitmnitifianit AGiley on iyi. cians adeilss 0 eek hide PDaees 95 plese oie OPA WHlel) DiltAtiys mac maerrr cian Se aun ns Inqms eons ls 6 Glens 3 97 Figs. 268 and 269. Oe. pseudacrosporum Wittr. PLATE XXXI. iat — Teg dly 5O MICRONS | Page Figs. 270 and 271. Oedogonium taphrosporum Nord. and Hirn. (Redrawn PROMIMELUTI)': 2.9.5 30 oo 8 lk ood Ss 8 Ss oe ge ee ee 97 Figs. 272-274. Oe. verrucosum Hallas. (Redrawn from Hallas)........:..... 95 Figs: 270 ande276. (Oexamericanim Iiranseau. eo. eee ee C7 PLATE XXXII. Z \ ZEEE Page Bie. 277. Ocdogonium paticocostatumy Transeaw 2... 625525. ee ee etn s 98 Hine? (ole. paucocostatuim, v- eracilisnUiilanyie. jcc ine cn cs se en's oan 98 nies) 279s OecanopilesWittra (eedrawninom Elin) hea. 2 - ce te oe ee 99 Fig. 280. Oe. nobile v. minus Hirn. (Redrawn from Hirn)................... 100 Figs. 281 and 282. Oe. tumidulum (Kuetz.) Wittr. (Redrawn from Hirn).... 99 Figs. 283 and 284. Oe. australianum Hirn. (Redrawn from Hirn)............ 99 221 PLATE XXXIII. SS. WEBES as SO MIC AONS | Fig. 285. Oedogonium insigne Hirn. (Redrawn from Hirn) Bick SoG Oensolebinnn ss dvednawar tromigelimt) seperate eee ae Bigs Zs pan 2oom .Oc. tatiusculum. Tiffany. oo. ssc ee eee oe Bisse 280-797seeOesinhimum alittaniye.. y 6c) cee ce ce ee eee oo mane Fig. 293. Oe. howardii G. S. West. (Redrawn from West) Hiss 294 (Oecshowardilvaminis (Mitianya se) ene ei eee ee etic aire Bigss 295=20 en Oevinversum Witth. 2) ocarns ace o ¢ seetoet yee celeste reer sore PLATE XXXIV. 312 298 is oes cae ete Tier any | 50 Mic Rows | 318 Page Pigs: 298 and’ 299: @edogonium pratense Transeaus.....0:05-5.. 221.2220. ees 102 nies 3005) Oeh acmandrium Eliv. (Redrawntromelirn)) 25. ... 5... 2... ees 103 Fig. 301. Oe. psaegmatosporum Nordst. (Redrawn from Hirn)...............108 Pigs ORE. “(OSS TeeVb NTIS AWARE, vn Os G10 cho bared Oo. Shale” e: cr ceed ac ce ee ano nee eee 103 Figs. 303 and 304. Oe. punctatostriatum De Bary. (Redrawn from Hirn)....104 Fig. 305. Oc. poecilosporum Nordst. and Hirn. (Redrawn from Hirn)........168 Figs. 306-308. Oe. quadratum Hallas. (Redrawn from Hallas)...............105 Figs. 309 and 310. Oc. calvum Wittr. (Redrawn from Hirn)................. 169 Bisall. ‘Oe. fusus Hallas. (Redraw from Hallas), oj) )pcgoe-s euon wees ren es 9 LO Fig. 312. Oe. inconspicuum Hirn. (Redrawn from Nordstedt)............... 1€0 ere) MONE UINIC OTIS ENT ESITNY EMT ANR SD sys Licctt, ch Mobay oy oie: « sage ote consents «kk Y 2 5 eed ps 160 Risen iO C MLADEINOSPOLUM= WiGttnans thie fee cies cleus: alete tals, 6 shteinelscianhels 159 Fig. 315. Oe. capitellatum Wittr. (Redrawn from Hirn).....................104 Hise Son Ocwousilamekeirolimen srarrrers Ais aye oa pringsheimii v. nordstedtii Wittr.. 5.25...) 5.. 20) eee 108 Fig. 331. Oe. pringsheimii v. abbreviatum Hirn. (Redrawn from Hirn)....... 107 PLATE XXXVI. 3843 345 50 MICRONS Fig. 332. Oedogonium petri Wittr. (Redrawn from Hirn)..................--105 Rievacs, Oe, spurium Har. |-(Redrawn trom Barn). 00.0 7s... 2... 2-2 lee 164 Pics geatbamGl seb, COesitincatien Iabbad, 55 ooo ea seb Same 6 eo Doe EOmemanon So ler 105 Fig. 336. Oe. virceburgense Hirn. (Redrawn from Hirn)...............-.--. 164 Fig. 337. Oe. sphaerandrium Wittr. and Lund. (a. After Borge. b. After INOS CEC) eee ere rae tn EPI te eter sole oe nas et riots ones creer 112 Fig. 338. Oe. pithophorae Wittr. (Redrawn from Hirn)................------ Te, Bye. 339. Oc. loricatum Him. (Redrawn from Hirn)..............22.-+-505 111 Fig. 340. Oe. simplex Hirn. (Redrawn from Hirn)................+-.++.++-- 111 Fig. 341. Oe. autumnale Wittr. (Redrawn from Hirn)...................+--- 112 Migssete and e40, Oc. nanum Wittr.s Dittany.c 6... 26s de. ed eee eee nee aes 109 Iie. GaN “COGh jeianive men Shina: 3, wee o seo ¢ oa DEO Oe seg ocieda cos waco! 105 Fig. 345. Oe. rupestre Hirn. (Redrawn from Hirn)..............-+++.-+++++> 114 Fig. 346. Oe. rupestre f. pseudautumnale Hirn. (Redrawn from Hirn)....... 115 225 PLATE XXXVII. Tera) | SOMICRONS Page Fig. 347. Oedogonium obesum (Wittr.) Hirn. (Redrawn from Hirn)......... 112 Fig. 348., ‘Oel'pyriforme Wittr. (Redrawn from Hirn))).2 995. eeu eee 110 Bis. 3495) Oerpyrulum Watts. ((Redrawnitirom Elin) ee eee eee ee ee eel oul Rizs50s Ocypynulumeyzamplius Maylore)) ys) see eee eee eee 111 Riese lsandiao2e sO ewelwitschiinvWeste ae 0 te oe eee Teenie etn eee 106 IMsgone sn OG HONS Ine Cae aacdaooddobecaspecc oon oncuocodvec sonds 106 Bigs, 06 and 307. ‘Oevdioicum Carter. (After Carter)! 3.2. 107 226 PLATE XXXVIII. ee Page Fig. 358. Oedogonium ahlstrandii Wittr. (Redrawn from Hirn)......*..si>2..115 Fig. 359. Oe. selandiae Hallas. (After ERS) eee, SO RED 161 Hig. 360. Oe. sancti thomae Wittr. and Cleve..°.-..................-. pee te 161 Fig. 361 and 362. Oe. porrectum Nord. and Hirn. (Redrawn from Hirn)...... 109 Figs. 363 and 364. Oe. pisanum Wittr. (Redrawn from Hirn).:........- 109 Figs. 365 and 366. Oe. pisanum v. gracilis Trans. and Tiff.................. 110 eee Oevoploneum Wriire me unsere ee. or OTR ae Ty 117 Pigs. 368 and 369. Oe. oblongum f. sphaericum (Hallas) Hirn. (After Hallas) .117 Fig. 370. Oe. oblongum f. majus (Nord.) Hirn. (Redrawn from Hirn)........117 Fig. 371. Oe. kirchneri Wittr. (Redrawn from LATTA) 8s 6 cer een Bek cc ote oe ete TT Fig. 372. Oe. oblongellum Kirch. (AttenW: and GS. West). .ii...0... 50. <. 116 Higeefe.. Oe pracitmum-Wittorand Lund:..........22.::... 0s rcchlccek.. 116 227 PLATE XXXIX. Figs. 374 and 375. Oedogonium nodulosum Wittr. (Redrawn from Hirn)..... 108 Fig. 376. Oe. nodulosum v. commune Hirn. (Redrawn from Hirn)........... 108 Figs. 377 and ace Oe. pachydermum Wittr. and Lund. (Redrawn from SUS en) seed easily CPR aa cose an sitio Stn B 115 Figs. 379 and 380. Oe. itzigsohnii De Bary. (Redrawn from Hirn)........... iLily Fig. 381. Oc. itzigsohnii f. heteromorphum Hirn. (Redrawn from Hirn)...... 118 Fig. 382. Oe. itzigsohnii v. minus West. (Redrawn from West).............. 118 Bigs, Seo-co0. Oc ailammitenume Watt NOL .. os sce ee eee meee erates 118 228 PLATE XL. 5O MICRONS Page Figs. 386 and 387. Oedogonium vesicatum (Lyng.) Wittr. (Redrawn from ‘63 TEetiacralh) ees 0 oh a ena pee See oie) ET RE Sh tS ~. os aass Peapeansevonanecdie Figs. 388 and 389. Oe. rhodosporum (Welw.) Wittr. (Redrawn from Hirn)...162 Figs. 390 and 391. Oe. montagnei Fior.-Mazz. (Redrawn from Hirn)......... 162 Figs. 392 and 398. Oc. pluviale Nord. (Redrawn from Hirn)................. 150 Fig. 394. Oe. flexuosum Hirn. (Redrawn from Hirn)........................163 Fig. 395. Oe. pilosporum West. (Redrawn from West)....................-. 165 Fig. 396. Oe. consociatum Collins and Hervey. (Redrawn from Collins)..... 167 Bisse Oesinchisumrinia (iedrawniromsblann)).....0...9¢.0s-es seem ene 169 229 PLATE XLI. 402 | 406 5O MICRONS ; Page Figs. 398 and 399. Oedogonium velatum Hallas. (Redrawn from Hallas)..... 164 Figs. 400 and 401. Oe. implexum Hirn. (Redrawn from Hirn)............... 153 Rigs 4025 Oestonticolavals Bre (Redrawmnitcona Elinm) eee ee ee 163 Figs. 403-405. Oc. spectabile Hirn. (Redrawn from Hirn)................... 153 His 406@ EO es reinschigRoy oradic cc ae way Aes oc et eA eee ee 172 230 PLATE XLII. Page Fig. 407. Oedogonium undulatum (Breb.) Al. Br.; Wittr. (Redrawn from Le bia) Jess Be Oe become tos Gin oc Hod ob. oo hb OkeRE Oley Ob: og eg Ee ea 118 Ee 40550 Oe. undulatumiy, americanumidirans 26. sees. ase). se eee ee 119 Fig. 409. Oe. undulatum f. senegalense (Nord.) Hirn.........................119 Figs. 410-413. Oe. nebraskense Ohashi (slightly on larger scale)............ 119 231 PLATE XLIII. 5O MicRrows Page Fig. 414. Oedogonium hystricinum Transeau and Tiffany............ Sk MR 120 Fig. 415. Oe. armigerum Hirn. (Redrawn from Hirn)....................... ise. Fig. 416. Oe. aster Wittr. (Redrawn from Hirn)........ I 120 Fig. 417. Oe. hystrix Wittr. (After Wittrock)................ es a 4 EP 120 Rig: 418; Oex hystrix-y- eanadense Tiffany: =: . 2... <5. seen ee eee 121 Fig. 419. Oc. hystrix v. subglobosum Wittr. (After Wittrock)............... 121 Biss. 420 and 421. Ge. echinospermum:Al. Br. :.. 5... Jo scene eee ce es es 121 Fig. 422. Oce..echinospermum v. horridum Hirn. (After Wolle).............. 122 PLATE XLIV. Fig. 430. Oe. spirale y. acutum West and West. (Redrawn from West)....... 123 Figs. 431-433. Oe. illinoisense Transeau. (Redrawn from Transeau)......_.. 123 233 PLATE XLV. 50 MIC ROWS Page Figs. 434 and 435. Oedogonium lindmanianum Wittr. (Redrawn from Hirn)..133 Fig. 436. Oe. echinatum (Wood) Wittr. Oospore. (After Wood)............ 133 Fig. 437. Oe. donnellii Wolle; Hirn. (Redrawn from Hirn).:................ 132 Figs. 438 and 439. Oe. donnellii v. wittrockianum Hirn. (Redrawn from Nab cal) Wives Side cee ee eae a RRR ieee | ree a Ne ee 132 Fig.440. Oe: hispidumyNoerdst. (Redrawn'from Hirm)i2). 400) en. see 137 Fig. 441. Oe. stellatam Wittr. (Redrawn from Hirn)).......)....5..0. 2... 27, 234 PLATE XLVI. 450 SO MIcRovs ec ady Fig. 442. Oedogonium manschuricum Skvortzow. (After Skvortzow)........ 126 Fig. 448. Oe. cleveanum Wittr. (A, antheridium; S, dwarf male stipe)....... 138 Fig. 444. Oe. cleveanum Wittr. (Redrawn from Hirn)....................-..138 Fig. 445. Oe. semiapertum Nord. and Hirn. (Redrawn from Hirn)...........124 Fig. 446. Oe. depressum Pringsh. (Redrawn from Hirn).................... 124 Biel pe Oe irrer laren Wittihwa tas wea wate: «aise hie bales tomes tre lele ean eee 131 Figs. 448 and 449. Oe. irregulare v. condensatum (Hallas) Hirn. (After ETE as) poner eee penn wir mre ee ER mossersee amie 132 Beso) aah to OC A EINIISPOCUM BW COG. a a's ce ee we oe pO os 131 fae 42.) Oc. tanltisporum v.maonium Ackley: . 0... 6. a. obs ee kn eee wae eens. 131 235 PLATE XIVII. 5O MICRONS Page Fig. 4538. Oedogonium gallicum Hirn. (Redrawn from Hirn).................124 Fis..454.Oensexanculare (Cleves voi ts.c sc beside b NO EL eee eee 126 Figs. 455 and 456. Oe. sexangulare v. angulosum (Hallas) Hirn. (After Vedas pictus cos einen’ kc mandate suate cess Bea aud, 7 eae NE a ae Pe ee 126 Fig. 457. Oe. sexangulare v. majus Wille. (Redrawn from Hirn).............127 Irters YS}. | COKE, lohetclbrovhl, INGEN AD rebakerMno Lise aa baad elected anes Beet Ne ceae ate 125 Pie 459 ee Oexpratiniigy-sZenneri dit anyerer ee sei eee ae eee ee ee 125 Figs. 460-462. Oe. braunii v. hafniense (Hallas) Hirn. (After Hallas)....... 125 236 PLATE XLVIII. ee MICRONS | Page Fig. 463. Oedogonium alternans Wittr. and Lund. (Redrawn from Hirn)..... 128 ies 404. OCacCOntOriumubial Asm mCAunbeTty El allllas)) coe is oe tae we acts als Gayot aebeue 147 Eigse 405-405-558 Oe; diintit Woods (Attem WOO). -2 sane ous. sos one elton Hieaoows Oes borisianumy, (ve Clo) eWiattres ser er ht tue. d ve ld ana wie eee 128 Fig. 470. Oc. borisianum v. westii Tiffany and Brown........................ 128 237 PLATE XLIX. 474 475 473 471 50 MIcROWs Page Ris, 4a Oedovonium flavescens) (Hass: )/ Witten.) ee ere eae nee 125 Pig. Aj2e Oersilvaticum blallas, (Atter Haillas)e.... =e eee yee We Fig. 473. ‘Oenvictoriense G'S. West. (After West), =. 975) 5.04. sne eee eee 19 Rise 474ae Oencrassiusculumy Wattr. 2 Je. 5. : ee eee ee eee 129 Figs. 475 and 476. Oe. crassiusculum v. idioandrosporum Nord. and Wittr....130 Fig. 477. Oe. crassiusculum v. cataractum (Wolle) Tiffany................... 130 238 PLATE ©: Page Fig. 478. Oedogonium crassiusculum vy. arechavaletae (Wittr.) Hirn. GiNedr anil feeciip tunisia een Ree Corse ey wre dG sa eee Figs. 479 and 480. Oe. wolleanum Wittr. (Redrawn from Hirn)..............135 Fig. 481. Oe. wolleanum v. concinnum Hirn. (Redrawn from Hirn)......... 135 Figs. 482 and 483. Oe. wolleanum f. insigne (Nord.) Hirn. (Redrawn frcm STEAL isfith) betas). ee an ves WER, (oa) eee 136 nd 485 ium Wittr. d 487 igerum um Hir ( m Hirn) 90. O um m (Wittr.) ( m inn) pase. PLATE: LIi. © ) POO Oe Ear ) VOC iO Eva CIO 70000 } Cort Tier aay 5O MICRONS Page Figs. 491 and 492. Oe. cyathigerum v. hormosporum (West) Hirn. (Redrawn LTO LING Lats) eye atte en a eT e TAN Siy e Me e Ay s Uoloo a eins cise ate 135 Fig. 493. Oe. cyathigerum v. ellipticum M. and W. (Redrawn from Hirn)....134.« ice 94 Oe siconcatenatiime (racse) MWiibticemerye tae cine. © lett. © > oaks ie cle cic = 136 Hie 4 055 Oc concatenatum b, nutchinsiaen(Witirs)pilinm., 2.25 ons et eee oe 136 241 PLATE LIII. Tiere Ray Page Figs. 496 and 497. . Oedogonium concatenatum v. rectangulare Rich. (After RES 2, ing a= 8 Son sn oe ae ae ea: eee 137 . Figs. 498 and 499. Oe. elegans West and West. (After West).........------. 138 Fig. 500. Oe. areschougii Wittr. (After Wittrock)............-..--.-+--+--: 140 Fig. 501. Oe. areschougii v. americanum Tiffany...........-...------+------- 140 Figs. 502 and 503. Oe. areschougiif. robustum Hirn. (Redrawn from Hirn). .140 Figs. 504 and 505. Oe. bengalense Hirn. (Redrawn from Ec ere 139 Figs. 506 and 507. Oe. rigidum Hirn. (Redrawn from Hirn)............-..-. 139 242 a. PLATE LIV. Page Fig. 508. Oedogonium brasiliense Borge. (Redrawn from Hirn).............. 140 igs. 5005) Oe indicum) Hin. o(redrawn trom! Him), ..2 42... . ees odo Bic- 510, ‘Oe: confertum Erm: (Redrawn from! inn). ......0......2 2... 225. 141 Fig. 511. Oc. perspicuum Hirn. (Redrawn from Hirn)...................... 141 Figs. 512 and 513. Oe. clavatum Hallas. (After Hallas)..................... 141 Pip. 314. - Oc. mirandtiam Siuja. (After Skuja).........2......2.:5-.-- ey Hipessios Oe. danicumetallasse (Aiter Hallas): .... 22... A Ae 145 243 PLATE. LV. SO MICRONS Figs. 516 and 517. Oedogonium longicolie Nord.; Hirn. (After Nordstedt)...144 Figs. 518 and 519. Oe. longicolle v. senegalense Nord. (After Nordstedt)....144 Biss 5205 sOewdecipiensawWittr, (Atter Wittrock) = ae a sense eee 145 Figs. 521 and 522. Oe. decipiens f. dissimile Hirn............... tis. Satay Ce 145 Figs. 523 and 524. Oe. decipiens v. africanum Tiffany. (Redrawn from Hirn).145 Fig. 525. Oe. decipiens v. bernardense (Bates) Hirn. (Redrawn from Hirn). .146 Biz, 526. (Oe. rothil (Le/@l) Pringsh: . (After -Pringsheim)eye es eee eee 144 Figs. 527 and 528. Oe. macrospermum West and West...................-...-146 Biz. 529, (Oes uleanum! Eine) \(Redrawnitrom Harn) 2... 22s en ae 170 2 Rie. 5305) Oe. bahusienseyNordst, j(AiitemiNordstedt). .. essence see eee 142 Fig. 531. Oc. bahusiense Nordst., oogonium seen from above................. 142 244 PLATE LVI. | 50 MICRONS Tierany Figs. 532 and 533. Oedogonium crenulatum Wittr. (After Wittrock)......... 171 Fig. 534. Oe. crenulatum v. gracilius (Nord.) Hirn. (Redrawn from Hirn)...171 Pig; doo. Oe. plicatulam Wittr: ~(Redrawinirom Hirn)............:.2c.ouee.- 170 Figs. 536-538. Oe. lagerstedtii Wittr. (Redrawn from Hirn)................. 170 Bite dsoe COE, OFlIauOICUI.W ihuies Elites sons ss cca teeet 142 Fig. 540. Oe. oelandicum f. minus Borge. (Redrawn from Borge)............ 142 Fig. 541. Oe. pulchrum Nord. and Hirn. (Redrawn from Hirn)..............170 Bies42 Oe. boreale Hur. s(kedrawn trom Elirm):...)...-...c.-ee+es0en oO) 147 erate IO oes TEV PATIL AANO Wi le ese oaths = ss, .seie 2c no, ote wares oom oe Boge 142 Hig.044. Oc: platygynim Wittr. “(After Wittrock). .°. 5... .5.00.... 0... t ae, 143 Fig. 545. Oe. platygynum f. obtusum Hirn. (Redrawn from Hirn)............ 143 Fig. 546. Oe. platygynum v. continuum Nordst. (After Nordstedt)...........148 Fig. 547. Oe. platygynum v. novae zelandiae Hirn. (After Nordstedt)........ 144 Een ore CONE ACMIM MISE AUN elles, fos Veale sas eles satan ie 146 (Figs. 533, 537, 541, 544 show also oogonia in optical section seen from above.) 245 PLATE, EV | 50 MICROWS Page Big. 5494) O edovonium macrandrium Wattren.4- eerie eile etre 151 Fig. 550. Oe. macrandrium f. acuminatum Hirn. (Redrawn from Hirn)...... 151 Fig. 551. Oe. macrandrium f. aemulans Hirn. (Redrawn from Hirn)......... 151 Fig. 552. Oe. macrandrium f. lundense (Wittr.) Hirn. (Redrawn from TeVeaitetay) Wepre bo th Sten clcits Gates one ws 2, oe Sayed baveit. ten rene @ es SO MICRONS Page Figs. 618-615. Oedocladium albemarlensis Lewis. (After Lewis)............. 51 Figs. 616-618. O. albemarlensis Lewis. Stages in cell division and ram lira oemeete ives ooh vss ce <2 ayo a vo eine AE agg gin oars ae a 51 Fig. 619. Oedocladium protonema Stahl. Habit sketch, showing vegetative and rhizoidal cells, the latter with two resting cells. (Redrawn from Stahl.) 51 Figs. 620 and 621. O. protonema Stahl. Male and female branches. (Redramwattro mags Fala) vers te oe =. 5 SER cde oe gE ee epee 51 Fig. 622. O. protonema Stahl. Part of filament with three side branches. (Redraiwantromro ta lili cis coh. 3 cM sie c. ttases eR Mee ae oe ee ere 51 Fig. 623. O. protonema Stahl. Sporeling. (Redrawn from Stahl). (G, cell ofereen ialament Reanotzo1d all cell) jee. esses cee ees eee 252 PLATE LXIV. |50 Mic RONS Figs. 624-630. Different positions of operculum in operculate oogonia of Oedogonium. 624, supreme; 625, superior; 626, supramedian; 627, median; 628, inframedian; 629, inferior; 630, infimus (basal). Figs. 631-635. Different positions of pore in poriferous oogonia of Oedogonium. 631, superior; 632, supramedian; 633 and 634, median; 635, inferior. Fig. 636. Subhemispherical basal cell of Oedogonium. Fig. 637. Elongated type of basal cell of Oedogonium. Fig. 638. Formation of oogonium O and suffultory cell S from a division of a vegetative cell, in Oedogonium. Figs. 639 and 640. Suffultory cells of Oedogonium. Figs. 641-645. Formation of oogonium in Bulbochaete. OO, young oogonium; PO, patent oogonium; EO, erect oogonium; US, upper suffultory cell; LS, lower suffultory cell; D, dwarf male with antheridium; A, andro- sporangium. Figs. 646 and 647. Development of 4 zoospores from germinating oospore. 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