gK572 .V4 V4 West, Villiara On some freshwater algae from the Vest Indies. J ourn. Linn, S o c ,3 o t • Vol • oO • 18 94 . un soLie FreslTY/aoer xil^jue from the Jest ^^'^ '^'^^ Indies* 3y Wm. West, F.L.S. asbistea ^^TANiCA by a. S. West. (Read Xst Feo. lb 94) Qakoen I'lates :CIII. -XVI.: Through the kindness oi Kr» Geor£,-e llur- "ra^^. of the iritish Iluseuci.I have been enabled to examine some Freshwater Algae v/hioh v/ere oollected by ]:r. W. R, Elliott on the islands of Dominica and 3t, Vincent from the former in Jlovember and December 1892, and from the latter in l.-ay of the same year. The material v/as preserved in weak spirit, and has proved to be veiy interesti:.^ . The algae were in numbered bottles; these numbers are used throu.^rhout the paper, as both material and slides, v;ith corresponding" nuDibers, can be consul- ted in the l-useum. The strictly aq^uatic specieB were mostly xrom warm or hot streams. Three of the gatherings were from mossy trees; these latter must have oeen very- must have been vei\' moist, as several species of Desmidieae occurred amon::st the various Gyanophyceae which formed the /^reater r^art of this mat- erial. Some at' the species v/ere very abundant, e. g. Symploca cuspidata, n. sp . ; there were others inteimiiigled with these, either in small patches or solitary, and very sp a r i n£;:ly . Va r i e 1 1 e s Summary. Genera. Species. & Forms. Gonf ervaceae 2 E Ghroolepideae 1 E Zygnemaceae 1 1 1 Desmidiaceae 3 6 1 55 Yolvocineae 1 1 ^ Protococcaceae I] Z lo ITostocaceae 1 Z «— Scytonemaceae 3 7 ^^ Sirosiphoniaceae .... £ 7 1 ^ Oscillariaceae ..... 3 4 1 Ghroococcaceae ..... 6 12 1 Liatomaceae 8 14 1 33 60 6 ' Of the above, 11 species and 4 varieties are new .W4 W4 JfaHh* I 4 > • • ■ O • • « t ♦ ALQ^ EfiOil THE WEST INDIES. 2(55 " Crass, fil." (as used in this paper) = the diameter of the sheath containing the trichomes. " Crass. trich."= the diameter o£ the cells without the sheath. Class CONFEEVOIDE^ ISOGAM-S. Ord. COXFEEVACE^. 1. CoxFEEVA BOMBTCiXA, Ag.^ forma MiNOE, Wille. {Om Hvileceller Jios Conferva, p. 21, t. 1. figs. 36-iO, t. 2. figs. 55, 56.) Crass, fil. 6-5-7-5 ^. ITah. In cold, warm, and hot streams, crater of Grande Soufriere, Domiaica. Nos. 880, 883, 884, and 908. 2. Ehizoclonium Beeggeexianum, Hauch in Nordst. Freshw, Alg. of New Zeal. Sf Australia, p. 17. Yar. dominicense, nov. var. (PL XIV. figs.' 17-24). Yar. filamentis dense intricatis, tenuior, articulis diametro 2-3plo lougioribus ; membrana cellularnai 1 /i crassitudine. Crass, cell, veget. 9-10 /i. Sab. In hot stream in crater of Grande Soufriere, Dominica. No. 880. In the more densely intricate portions almost every cell emitted a short lateral branch, usually consisting of one cell. Ord. Cheoolepide^. 3. Teextepohlia odoeJlTA, Wittr. (Scand. Vdxter. t. 4. p. 16.) [Chroolepus odoratum, Ag. Syst. Alg. p. 35.] Crass, cell, veget. 12-20 /x ; crass, zoogonidang. 33-37*5^. T. zoogonidangiis lateralibus, iuterdum terminalibus, subglo- bosis, sessilibus (bine inde pedicellatis). Hah. On bark. Bow-wood Hills (1580 ft.), St. Yincent. (8-12-91.) No. 23. — On trees, Government House, St. Yincent, 900 ft. (10-12-91.) No. 27. 4. T. YiLLOSi, Be Tom. (Sgll.^ Alg. i. p. 239.) [Chroo- lepus villosa, Kuetz. JPhyc. gener. p. 2S4 j Species Algarum, p. 428.] Crass, cell, veget. 18-23 /i. Hah. On rocks, Soufriere, Dominica. (2-7-92.) No. 20. LINN. JOUEN. — BOTANY, TOL. XXX. XT 266 ME. W. WEST ON SOME FEESUWATEB Class Conjugate. Ord. ZVGNEMACEiE. 5. Ztgnema (Ztgogonitjm) pachtdermtjm, nov. sp. (PI. XIII. figs. 1-16.) Z. csespitibus intricatis ; fi.lis flexuosis (et iDterdum genu- flexuosis) dense intricatis, hinc inde ramulis brevibus irregulari- busque cellularum 2-6 ; cellulis vegetativis diametro 2-2|plo (ssepe 3plo) longioribus (rarius sequalibus); membrana cellu- larum crassa vel crassissima; zygosporis in tubo conjugationis brevi inter cellulas sitis, subglobosis, subellipsoideis, pleruiiique irregularibus (saepe constrictis) ; membrana zygosporarum cras- sissima, irregulariter lamellosa ; azygosporis globosis subglobo- sisque, zygosporis similibus sed membrana tenuiore. Crass, cell, veget. 16-23 /z (usque ad 26 /i et plerumque 20 ju) ; crass, membr. cellularum l*5-5*5 /i ; long, zygosp. 25'5-33 \x (usque ad40/j); lat. zygosp. 19-26 /u (usque ad 30 /x); crass, membr. zygosp. 2*5-6'5 \x ; diam. azygosp. 23-26 /i ; crass, membr. azygosp. l"9-3'8/Lt. Hah. In mud, warm stream, crater of Grande Soufriere, Dominica. No. 883; also in no. 908, and sparingly from no. 882. — This also occurred, without zygospores, on old wall, Eoseau, Dominica. (1-8-92.) No. 473. This species has a thick membrane which at first sight reminds one of a Ilhizoclonium or a large species of Conferva, the some- w^hat irregular filaments with short branches resembling the former especially. The many examples of conjugation examined were all scalariform, the zygospores completely filling the short conjugating-tube, their variability being remarkable. Spores w'ere seen (figs. 9-10) which were undoubtedly azygospores, and these were regular in shape. One example was noticed where the zygospore was double. The material was preserved in weak spirit ; but the two chromatophores were in most examples distinct and in their normal position. Var. coNFERVOTDES, nov. var. (PI. XIV. figs. 1-6.) Var. cellulis tenuior, diametro plerumque l-l|plo (rarius 2|pl(») longioribus. Crass, cell, veget. 10-13 jjl. Hah. In mud, warm stream, crater of Grande Soufriere, Do- minica. No. 883. Intermingled with the typical form, but not 80 abundant. ALG^ rRO:M THE WEST INDIES. 2G7 This variety has the cells of the filaments often somewliat doliform, and closely resembles a Conferva ; it does not, how- ever, break up in the peculiar manner of any species of Conferva {vide fig. 6). The binate chromatophores also put it out of this genus. Fig. 4 probably represents an attempt at con- jugation. Two cells are figured (fig. 5) which show an attempt at longitudinal division. Ord. DESMIDIACEiE. 6. Mesotjenium MiCROcoccrM, Kirchn. {AJg. Schles. p. 134.) [PalmogloBa micrococca, Kuetz. TahulcB phycolog. i. p. 20, t. 25. f. 5.] Long. cell. lo-5-l7'3 /x ; lat. cell. 7-5-9 it. Hah. On trees among mosses, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 90i.— On Bow-wood Hills (1580 ft.), St. Vincent. (8-12-91.) No. 23. 7. M. CHLAMTDOSPORUM, J)e 5^/ry. (Co??j.'p. 7o ; Cooke, Brif. Desm. p. 47, pi. 18. f. 14; JVest, Freshw. Alg. of W. Ireland in Journ. Linn. Soc. vol. xxix. p. 131, pi. xxiv. f. 8.) Long. cell. 19-23 fi ; lat. cell. 12-5-14-5 ju. Sab. On trees among mosses, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 904. 8. Tetmemoeus l^vis, Ealfs. {Brit.Besm. p. 147, t. 24. f. 2.) Long. 57-5-65 ;u; lat. 19-20^ ; lat. isthm. 17-5-18-5^. Hah. In mud, warm stream, crater of Grrande Soufriere, Do- minica. No. 883. 9. CosMAEiUM PSEUDOPTRAMiDATTJM, Lund. (Desm, Suec. p. 41, t. 2. f. 18.) Long. 46-48 /x ; lat. 24-25 /z ; lat. isthm. 9-5-12-5 fx. Hah. On damp wall of dam, Sharp's Eiver, St. Yincent. 'No. 477. *STENONOTrM, Nordst. in Wittr. et JS'ordst. Desm. et OS dog. in Ital. et Tyrol, p. 32, t. xii. f. 8. Forma mince, JRacih. {Desmidya IV podrozy na ohlo ziemi, p. 4, t. i. f. 32). (PI. XIY. fig. 25.) Long. 36-36*5 /x ; lat. 23-24 ^, ; lat. isthm. 6-5 fx ; crass. 13-5 yu. Hah. With the typical form, but much more abundant. 10. C. OBLIQUUM, Nordst. {JBidrag till k'dnned. am Sydligare r2 2G8 ME. W. WEST ox SOME EllESHWATEE Norges Desm. p. 23, t. 1. f. 8). Forma minoe, Nordi>t. (I. c). (PI. XIII. fig. 17.) Long. 14*5 /Lt; lat. 11-5^; lat. istlim. 6-5/^; crass. 9*5 /w. S«&. Amongst Sy^nploca cuspidata, n. sp., on trees, summit of Trois Pitons (4500 ft.), Dominica. No. 904. This interesting species seems to Lave a varied kind of habitat, occurring in small upland tarns and pools, on dripping subalpine rocks, and in the present instance on damp mossy trees. 11. CosMAEiUM CucuEBiTA, Breb. {Balfs, Brit. Besm. p. 108, t. 17. f. 7.) Long. 40 fx ; lat. 21 /j ; lat. isthm. 19 ju. Hub. On trees among mosses, summit of Trois Pitons (4500 ft.), Dominica. No. 903. Class C (E N o B I E JE. Ord. YoLYOCiNE^:. 12. EuDOEiNA STAGNALE, WoUe. {FresJitv. Alg. ofU. S. p. IGO, pi. clii. figs. 11-21.) Yar. cellulis parvis et distantibus. (PI. XYI. fig. 10.) Diam. cell. 4-8-5-6 /i ; diam. coenob. 63 ^. Hab. Amongst mosses on trees, with Hapalosiplion intricaius, n. sp., and Symploca cuspidaia, n. sp., summit of Trois Pitons (1500 ft.), Dominica. No. 903. Class Peotococcoide^. Ord. PEOTOCOCCACEiE (incl. BaJmellacece). 13. Ueococcus i^siQSJS, Kitefz. [Chlorococcusmacrococcus, Babh., et var. aureus, BabJi. Fl. Burop. Alg. ii. p. 33.] Diam. cell. 2.3-31 /u ; c. teg. 42 /u. Hah. On mossy trees, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 904. 14. Cebasteeias staveastroides, nov. sp. (PI. XIY. fig. 16.) C. quadriradiata e corpore distincto, radiis elongatis sensim attenuatis et minute granuhitis, apicc obtusis. Diam. c. proc. 30-35 ^x ; diam. corpor. circ. 9-9-5^. Jlab. AVith ^cyloncma javanicum, Bornet, amongst mosses, on lime-trees, Slianlord Estate, Dominica. No. 901. The rough arms of this species remind one very forcibly of a small JStaurasfrum, and sulliciently characterize it. ALO^ FROM THE WEST INDIES. 2G9 Class Phtcochromace^. Subclass XoSTOCHIN^EiE. Ord. NosTOCACE^. 15. NoSTOC HUAIIFUSUM, Carm. ex Harvey in Hookers Brit, Flora, ii. p. 399. {Kuetz. Species Alrjar. p. 301 ; Eahh. Fl. Furop, Alg. ii. p. 183.) Diam. cell. 2-3 \i ; diam. lieterocysfc. 3*5 \i. Hah. On lime-trees, Sliaiiford Estate, Dominica. No. 901. — On trees, summit of Trois Pitons (1500 ft.), Dominica. Xo. 903. 16. IS". SPHERIC c:m, VaucJier. {Cooke, Brit. Freshw. Alq. p. 231, t. 91. If. 8-11; Bornet et Flaliault, Fevis. des Nostoch. Heterocyst. p. 208.) Diam. cell. 38 /it ; diam. heterocyst. 5-5*7 i-l ; diatii. thall. usque ad 10 mm. Hah. On damp wall of dam in Sharp's River, St. Vincent. No. 477. Ord. SCTTOXEMACEJE. 17. MiCROCHiETE TENUISSIMA, UOV. Sp. (PI. XIV. figS. 7-11.) M, inter algas varias alias reperta ; filis tenuissimis, sub- intricatis, contortis ; vaginis hyalinis, achrois, amplis ; articulis elongatis, diametro 5-9plo longioribus, articulis junioribus bre- vioribus (circiter diametro duplo longioribus) et crassioribus ; heterocystis intercalaribus, subquadratis vel oblongis. Crass, fil. 4'1-51^; crass, trich. 1-1'8/u; crass, heterocyst. 2-2'4/u; long, heterocyst. 3"5-6'5 //. Hah. Amongst Symploca cuspidata, n. sp., on trees, summit of Trois Pitons (1500 ft.), Dominica. No. 901. 18. Sci'TONEMA java:nicum, Bornet {in Bornet et Thuref, Notes Algologiques, p. 148 ; Bornet et Flali. Fevis. des Nostoch. Heterocyst. p. 95). [Symphyosiphon javanicus, Kuetz. Species Algarum, p. 323 ; TahulcB phycolog. ii. p. 13, t. 43. f. i.] (Pi. XIV. ligs. 12-15.) Crass, fil. 13-16 /z; crass, trich. 8*5-11 fi. Hah. On lime-trees, Shanford Estate, Dominica. No. 901. — Anguilla, W. Indies. (23-3-92.) No. 70.— On the walls, Eoseau, Dominica. (9-7-92.) No. 236. The above agrees well with this species, the most notable dif- 270 MR. W. WEST OlS SOME TEESHWATEK ference being in the branclies not being aggregate. The hetero- cysts vary from subquadrate to subrotund, and are rather numerous. 19. SCTTONEMA AMPLUM, nOV. Sp. (PI. XVI. figS. 14-16.) S. strato parvo, pannoso, 3-5 mm. lato, fusco ; filis dense iii- tricatis ; pseud oramis sparsis plerumque gemiuatis sed interdum singulis, filo priraario tenuioribus ; vaginis amplissimis stralis parallelis formatis, in parte exteriore gelatinoso-achrois vel sub- luteolis, in parte interiore abrupte luteo-fuscis ; trichomatibus angustis, luteo-viridibus, ad apicem pseudo-ramulorum crassior- ibus et articulis brevioribus ; articulis diametro S^-Gplo (ple- rumque 4plo) longioribus ; heterocyatis oblongis, diametro 3-3|plo (rarius 2plo) longioribus. Crass, fil. prim. 19-24 /z ; crass, ramul. 13*5-16 /j. ; crass, trich. 3-5-4 /x. Hab. On trees, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 901-. — Growing about and upon the surface of Symploca cuspidata, n. sp. The nearest species to this with regard to the comparative length and breadth of the cells is S. ambigimm, Kuetz., from which it differs in its much larger size, stouter habit, compa- ratively broader sheath, and in the more unfrequent branches. The branches are usually geminate though not unfrequently single, and they are always thinner than the primary filament. The trichomes at the apices of the branches become almost twice as thick, the cells becoming very much shorter. S. mijo- chrous, Ag., is somewhat similar though larger, and has not such a comparatively broad sheath, and the latter is ocreate. 20, S. AMBIGUUM, Kuetz. {Species Algaruin, p. 894 ; Tabulcs phjcolog. ii. p. 7, t. 26. f ii.) (PL XY. figs. 11-15.) Crass, fil. 9'5-11'5/Lt; crass, trich. 2-2*5 /i. Hab. On trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. — On the ground, mostly in old Diablotia holes, Morne Anglais (2300 ft.) (15-7-92.) No. 493. AmoT\^&t Symploca. The figure given by Kuetzing (/. c.) is very indistinct ; but the specimens agreed well with the description given by Bornet and riahault (Eevis. des Nostoc. Ilcterocyst. p. 100), excepting that the filaments were a little thicker (9"5-ll*5 ^i against 6-9^/). The trichomes were, however, the same. One of its chief characters is its long and narrow cells, which get shorter and thicker (up to 3-8 /u) towards the apices of the young ALG^ FROM THE WEST INDIES. 271 brandies ; the sheath also becomes hyaline. The cells often appeared like the section of a biconcave lens, owing to the con- traction produced by the dilute spirit in which the material was preserved. 21. ScYTONEMA FiGTJEATTJM, Agardli. {Syst. Algav. p. 38.) [Scytonema ealotrichoides, Kuetz. Species Algarum, p. 307 ; TahulcB phijcolog. ii. p. 6, t. 22. fig. ii. ; Rahli. Fl. Europ. Alg. ii. p. 253.] Crass, fil. 15*5-23 /x ; crass, trich. 18-13*5 /z. Hab. On damp wall of dam, Sharp's Eiver, St. Vincent. No. 477. — On trees, summit of Trois Pitons (4500 feet), Dominica. Nos. 903 and 904. 22. SCTTONEM"A, Sp. Crass, fil. 28-36 /u ; crass, trich. 5-5*5 /u. Sab. Amongst >S'. javanicum, Burnet, on lime-trees, Shanford Estate, Dominica. No. 901. Only a small quantity of this was seen, whicb was insufficient for accurate determination. The characters were those of ^S*. deiisum, Bornet, and it probably is a small variety of this species. 23. ToLTPOTERix TE>^uis, Kuetz. {Phycolog. gener. p. 228 ; TahulcB phijcolog. ii. p. 9, t. 31. f. ii.) [T. pygaiaea, Kuetz. T. flaccida, De Bary.'] Crass, fil. 7-7*7 }x ; crass, trich. 5*7 /x ; heterocyst. 77 x 5*7 fx. Hah. On damp wall of dam, Sharp's Kiver, St. Vincent. No. 477. Ord. SlROSIPHONIACE^. 24. Hapalosipho:!^ INTEICATUS, nov. sp. (Pl.XV. figs. 16-28.) II. caespitibus parvis, aeruginosis ; fills densissime intricatis eb yariabilibus, adultis vaginis arctis distinctis (interdum pauUo indistinctis) e cellulis singulis formatis, sparsim ramosis ; ramis singulis unilateralibus flexuosis, filo primario subsimilibus, vagi- natis vel evaginatis ; cellulis variabilibus, diametro l|-3plo lon- gioribus, ssepe sequalibus et subrotundis, interdum elongatis ; heterocystis intercalaribus, subquadratis vel oblongis (diametro l-3plo longioribus). Crass, fil. 4-7 jLi ; crass, heterocyst. 3'8-5'5/i. Sal. In little intricate tufts among the leaves of Leucohryim, on trees, summit of Trois Pitons (4500 ft.), Domiuica. No. 903. 272 ME. W. WEST ON SOME FEESHWATEE The nearest species to this hitherto described is H. laminosiis, Hansg. [" Ueber den Polymorph, der Alg.," Botan. Centralb. 1885, p. 48 {cfr. Boriiet et Flah. Eevis. des Nostoc. Hetero- cjst. p. 55)], from which it differs, however, in not being calcified in any way, in being a little larger, in having its single and. unfrequent branches of a similar thickness to the primary filaments without any attenuation, and. in its peculiar habitat. The heterocysts are of the same breadth as that of the cells (or narrower), whilst those of H. laminosus are often broader. Like the latter, the threads are very variable, being sometimes similar to an Anabcena, sometimes like a Lynghya^ while at other times the cells are quite irregular and somewhat inflated. Some examples showed the rounded granulose bodies noted by Hansgirg in H. laminosus (Bemerkungen zur Systematik einiger Siiss- wasseralgen, p. 18). These bodies when fully formed appear to be thick-walled (figs. 23-28) and have a diameter of 6-13 /u. The cell of the primary filament immediately under a branch always projects more or less into the sheath of the branch. 25. Hapalostphon FLExrosus, Borzi. {Alghe d'acq. dole. d. Bapua^ in Nuovo Notarisia, Apr. 1892, p. 43.) Crass, fil. 7'5-8*5^ ; crass, cell. 5-5-6 ;u; long. cell. 4-4'5 /i. Hah. In stream, Grande Soufriere, Dominica. No. 884. 26. H. AEBOEEUs, nov. sp. (PI. Xy. figs. 1-3.) H. inter alias algas repertus ; filis primariis flexuosis, passim ramosis uno latere e cellulis singulis ibrmatis, eellulis diametro 1-1 ^plo (rarius 2plo) longioribus, vagina arcta, tcnui, et achroa ; filis secundariis brevibus, crassitudine filis primariis similibus sed subtenuioribus, cellulis diametro subicqualibus ; heterocystis quadrato-oblongis, intercalaribus. Crass, fil. 7-10^; crass, cell. 7-9"5 /ii ; heterocyst. 6-9 /x x9-ll^. Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. The nearest species to this is H.Jlexuosus, Borzi (/. c), from which it differs in not possessing flexuose intricate branches on every side ; it is also a rather larger species, with cells often a little longer than broad and never depressed. 27. Stigonema noEMOiDES, Bornet et Flah. {Bcvis. des Nosfoc. Heteroci/sf. p. (ID.) [Scytonema hormoides, Kurtz. Sirosiphon brevis, Kuetz. Botan, Zeit. 1847, p. I'JG ; Tahulce phycolog. ii. alGjE from the west ixdies. 273 p. 10, t. 34. f. ii. Sirosiplion hormoides, Kuetz. Sj^ecies AJgar. p. 316; Talulce pity col Ofj. ii. p. 10, t. 34. f. iv.] Crass, fil. 9-13 fx. Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 904. Eatber scarce. — On rocks, Eoseau Valley (1000-2000 ft.), Dominica. (27-6-92.) No. 24. Var. tentje, nov. var. (PL XY. figs. 4-8.) Var. minor, filis tenuioribus, 5*5-7 /it crassis. Hah. With the typical form, but much more abundant. It was intermixed with Syitiploca cuspidata, n. sp., Stigonema mi?iuia, Hass., Scytonema amhigua, Kuetz., &c. 28. Stigo^stema panniforme, Bornet et FlaJi. {Revis. des Nostoc. Keterocyst. p. 71.) [Scytonema panniformis, Agardli ; Sirosiphon panniformis, Kuetz.A^ Crass, fil. 23-26 /i. Hai. AVith the preceding. Another gathering from the same locality had abundant hyphae (an incipient lichen). No. 779. Crass, til. 15-25 fx. 29. S. MIST7TUM, Hass. {Hist, of Brit. Freshw.Alg. i. p. 230, t. 67. ff. 3-4.) Crass, fil. 19-25 /i. Hah. On damp wall of dam. Sharp's Eiver, St. Vincent. No. 477. — On trees, summit of Trois Pitons (4500 ft.), Do- minica, no. 903 ; and on lime-trees, Shanford Estate, Dominica, no. 901. 30. S. INFORMS, Kuetz. {Species Algar. p. 319 ; Tahulw pliy- colog. ii. p. 11, t. 38. f. iii.) Crass, fil. 44-52 ix. Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 904. Ord. Oscillartace^. 31. Stmploca cuspidata, nov. sp. (PL XVI. figs. 1-7.) S. bryophila, late expansa, griseo-lutea ; fasciculis erectis, angustis subulatis, aggregatis (passim densis), 8-15 mm. altis, seruginescentibas ; trichomatibus aerugineis, flexuoso-intricatis, in strato strictioribus, apicibus versus fasciculorum, 1-3 in lata vagina inclusis, saepe interruptis, distincte articulatis ; articulis diametro 2-4plo longioribus ; vaginis amplis, acbrois, pellucidis 274 MR. W. WEST OX SOME ERESHWATEE vel interdum stratis parallelis formatis, in ambitu ssepe sub- rugosis, apice angustioribus et saepe ramosis. Diam. tricli. (s. vag.) l*9-2'3/x; crass, tricb. c. vag. 13'5-25^t. Hah. On trees, summit of Trois Pitons (4500 ft.), Dominica. Nos. 903 and 904. Yar. LUTEOFXiscA, nov. var. Yar. ferruginea, strato denso, 1-2 mm. alto, fasciculis brevior- ibus, 4-6 mm. (interdum 10 ram.) altis, articulis crassioribus. Crass, trich. 2"5-3'5 fx ; crass, vag. 15-40 fx. This variety also often has two, three, or more threads in one sheath. Hah. On rocks, Eoseau Yalley (1000-2000 ft.), Dominica. (27-6-92.) No. 24.— On bark, windward road to lake (1000- 2000 ft.), Dominica. (25-8-92.) Nos. 5 13 and 511 .—Also on the ground, mostly in old Diablotia holes, Morne Anglais (2300 ft.). (15-7-92.) JN'o. 493. Thicker and coarser sheath. The specimens preserved in liquid strongly reminded one of Sphac/num euspidatum ; they occurred amongst mosses in penicillate tufts which were subaerugioose towards the apices, the sheaths, but not the trichomes, here becoming narrower. Many of the sheaths in the stratum were without trichomes ; and in consequence of this, and the broader sheaths at the base, the stratum was paler than the erect fasciculi. 32. Ltngbyapenicillata, Kuetz. {Botan. Zeit. 1847, p. 194.) [Leibleinia penicillata, Kuetz. Species Algar. ; Tahulce phycolog. i. p. 46, t. 81. f. ii.] Crass, fil. 3-3'5/u. Hah. On bed of stream in crater of Grande Soufriere, Dominica. No. 881. 33. L. SUBTILE, West. {Alg. of the Eng.Lake Distr. inJourn. Boy. Micr. Soc. Dec. 1S92, p. 741, pi. x. f. 58.) Crass, fil. 1'4 /t. Hah. AVith the preceding. 34. PnoRMiDiUM LTXGBYACEUM, Kuetz. {Pliijcol. gener. p. 194; Tahulce phycolog. p. 33, t. 46. f. iii. ; Bahh. Fl. Europ. Jig. ii. p. 124.) Crass, fil. 3'5-4^t. Hah. On damp wall of dam. Sharp's Eiver, St. A'incent. No. 477.— On old wall, Dominica. (1-8-92.) No. 473. The cells were about as long as broad (sometimes a little longer). ALG^ feom: the west is^dies. 275 35. Phormidium, sp. Crass, fil. 1-2-1-5 fi. Stratum deuse, thin, and dark SBruginous. Hab. On damp wall, Eoseau, Dominica. (5-9-92.) No. 546. Ord. Chroococcace^. 36. Chroococctjs MiJfOR, iVi^ey. {Gattung. e{nzell.alg.^.4i7, t. 1a. f. 4. Bahh. Fl. Eiirop. Alg. ii. p. 30.) [Protococcus minoT^ Kuetz. Species Algar. p. 198; Tahulce pTitjcolog. i. p. 3, t. 3.] (PL XVI. fig. 17.) Diam. cell. 2-8-4 /z ; diam. fam. 11-5-30 ^t. Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. '^o. 477. — On trees, summit of Trois Pitons (4500 ft.), Dominica. No. 603. Forma minima. (PI. XVI. fig. 18.) ■ Forma cellulis familiisque minoribus quam forma typica. Diam. cell. s. teg. 1-1*9 ^t ; diam. fam. 10-23 /x. Hah. Along with the type from the above-named localities, and also on lime-trees, Shanford Estate, Dominica. No. 901. 37. C. COH^REifs, JS'aeg. (Rahh. FL Europ. Alg. ii. p. 30.) [Pleurococcus cohaerens, Bre'b., 1842. Protococcus cohaerens, liuetz.^ Diam. cell. 3-S-6-5 /.i (usque ad 7-5 /i) ; diam. fam. 30-173^. Hab. Amongst other algae on trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. This usually occurred in small families, but occasionally in very large ones, and now and then in solitary examples. 38. C. TURGiDrs, A^a^'y. (Gatt.einzell.AJg. -p. 4Q. Bahh. Fl. Furop. Alg. ii. p. 32.) [Protococcus turgidus, Kuetz. TahulcB pligcolog. i. p. 5, t. 5. f. i.] Diam. cell. s. teg. 7'5-10*5 fx, c. teg. 21-23 ^. Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. No. 477. A rather small form. 39. C. scHizoDERiiATicus, West. {Alg. of the Fng. LaJce Bistr. in Journ. Boy. Micr. Soc. Dec. 1892, p. 742, pi. x. ff. 61-63.) (PI. XVI. fig. 19.) Diam. cell. s. teg. 11'5--13 fx ; diam. c. teg. 23-28 fx. Hah. AVith the preceding species, but much more abundant. 276 MR. W. WEST OX SOME FEESHWATER 40. Gi-LtEOCAPSA MURALTS, Kuetz. {TahulcB phycolog. \. t. 21. f. i. ; Rahh. Fl. Europ. Alg. ii. p. 36.) Long. cell. s. teg. 5*5-7'5 fx ; lat. cell. s. teg. 2'5-3 /x ; diam. fam. 19-25 /u. Hab. Ou damp wall of dam, Sharp's Elver, St. Yincent. ]S^o. 477. The cells were longer in relation to their breadth than those figured by Kuetziug {I. c). 41. a. GiGAS, nov. sp. (PI. XVI. figs. 11-13.) G. familiis solitariis vel subaggregatis ; cellulis magnia, subglo- bosis vel oblongis, 4-36 in familiis subglobosis consociatis, mem- brana cellularum Igeva vel subtiliter granulata (vide fig. 11), cytioplasmate serugineo et granuloso ; tegumentis subglobosis, ad exteriorem duris saepe subrugosis, luteo-fuscesceutis, lameliis extra cellulas indistinctis, paucis et pallido luteolis. Diam. cell. s. teg. 9-15 fj, (plerumque 11 jj) ; diam. fam. U-115 fj. Hab. On damp wall of dam, Sharp's Hiver, St. Vincent. No. 477. This occurred amon^Bt J^osfoc sphce}'icum,Yiiuch., in no definite stratum ; and it is sufficiently distinguished by its large cells and other characters. 42. Gl(eocapsa, sp. Crass, cell. s. teg. 2-3 yu. Nos. 23 and 24. 43. Gl(eocapsa, sp. Crass, cell. s. teg. l'5u. No. 546. 44. Aphanocapsa elachtsta, nov. sp. (PI. XV. figs. 9, 10.) A. tegumento minutissirno, subgloboao, firmo, gelatinoso non lamelloso, achroo ; cellulis minutissiiuis, sphaericis, solitariis gemi- natisve, laxe dispositis ; cytioplasmate homogeneo et teruginoso ; tegumentis non aggregatia in thallo distincto. Diam. cell. l'5-l*8/u (usque ad 2 fi) ; diam. teg. 26-38 /u. Hab. On trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. — And in stream, Grande Soufriere, Dominica. No. 884. This species seems characteristically distinct by reason of its minute cells in the very small globose colonies, which were scattered amongst other algae. 45. Glceotiiece linearis, ]}^aeg. {Oattung, einzelh Alg. p. 58, t. 1 G. f. 2 ; liabh. FL Eitrop. Alg. ii. p. 60.) ALG^ FROM THE "WEST INDIES. 277 Long. cell, sine teg. 5"5-6'5 n, c. teg. 13'5 fi ; lat. cell, sine teg. 1'8/i, c. teg. 9*5-10*5/x. Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. Ko. 477. Forma cellulis 5-6plo longius quam latius. (PI. XIV. fig. 26.) Long. cell. s. teg. 11*5-135 ^, c. teg. 21/x; lat. cell. s. teg. 2-2-3 /L/, c. teg. ll-5-12-5^. Hah. With the typical form. 46. Glceothece lunatum, nov. sp. (PI. XYI. fig. 9.) G. cellulis 2-4 in familiis consociatis, subcresceutiformibus, 2plo longius quam latius, apicibus acutis ; tegumentis univer- salibus, ovalibus vel ellipticis ; cytioplasmate serugineo et ho- mogeneo. Lat. cell. 2'o-2 7 n; apicibus cellularum 4*8-5'7/z inter se distantibus ; famil. 325 x 19 fx. . Hah. With Gl. linear is , Naeg., but very scarce. 47. Aphanothece saxicola, Naeg. (Z. c. p. 59, t. 1 h. f. 2.) Lat. cell. 1-4-1-8 //. Hah. In small masses of 70-120 ix in diameter, amongst mosses on trees, summit of Trois Pitons (4500 ft.), Domiaica. Nos. 903 and 904. Eather scarce. 48. A. MiCEOscopiCA, Naeg. (Z. c. t. 1 h. f. 1.) Long. cell. 5'5-7*5^i; lat. cell. 3'8-4-dfc/Lx; diam. famil. 108- 179 /i. Hah. On damp wall of dam. Sharp's Eiver, St. Yineent. No. 477. — Amongst Symploca cuspidata, n. sp., on trees, summit of Trois Pitons (4500 ft.), Dominica. No. 904. 49. Teteapedia teigona, nov. sp. (PI. ^YJ. fig. 8.) T. cellulse triangulares, lateribus concavis, angulis subrotun- datis ; a latere visae ellipticse ; cjtioplasraate pallide serugineo et bomogeneo. Lat. cell. 7"2 /x ; crass. 3*6 ju. Hah. On damp wall of dam, Sharp's Eiver, St. Yineent. Ko. 477. Class Diatom ACE JG. 50. EpithemiaWesteemanni, Kuetz. {Pritch.Infus. ed. 1861, p. 700, t. 4. f. 2.) Hah. In stream, crater of Grande Soufriere, Dominica. Nos. 881 and 908. 278 MR. W. WEST ON SOME FRESU WATER 51. EuNOTiA Arcus, Ehrenh. {TV, Sm. Brit. Diat. ii. t. 33. f. 283.) Hah. In stream, crater of Grrande Soufriere, Dominica. No. 908. 52. E. GRACILIS, Bahh. (Fl. Europ. Alg. i. p. 72.) [Kiman- tidium gracile, Ehrnh., TV. Sm. Brit. Diat. ii. p. 14, t. 33. f. 285.] Hob. Amongst mosses, on trees, summit of Trois Pitons (4500 ft.), Dominica. No. 903. 53. Odontidium MrTABiLE, W. Sm. (Brit. Diat. ii. p. 17, t. 34. f. 290.) Hah. On damp wall of dam. Sharp's Eiver, St. Vincent. No. 477. 54. Desmoqo^^ium Eabenhorstianum, Grun. {Biat. ins. Banlca, p. 6, t. i. f. 1 ; Be Toni, SyUoge Algar. vol. ii. p. 680.) Hah. Abundant in stream (hot and cold), crater of Grande Soufriere, Dominica. No. 908. 55. NiTZSCHiA PARTULA, W. Sm. (Brit. Biat. i. p. 41, t. 13. f. 100.) Hah. On damp wall of dam, Sharp's Eiver, St. Vincent. No. 477. 56. N. FLEXELLA, Suring. {Alg.Japon. p. 11, t. 1. f. 12.) Long. 33-44 {.i ; lat. 3-8-4-8 /u. Hah. In streams, Grande Soufriere, Dominica. Nos. 881 and 884. 57. N. linearis, W. Sm. {Brit. Biat. i. p. 39, t. 13. f. 110.) Hah. On damp wall of dam. Sharp's Eiver, St. Vincent. No. 477. — And in streams, Grande Soufriere, Dominica. Nos. 881 and 908. 58. N. minutissima, W. Sm. {L. c. p. 41, t. 13. f. 107.) Hah. In stream, Grande Soufriere, Dominica. No. 884. 59. Navicula cryptocepuala, Kuctz. (W. Sm. I. c. p. 53, t. 17, f. 155.) Hah. On damp wall of dam. Sharp's Eiver, St. Vincent. No. 477. ALG^ FEOM THE WEST INDIES. 279 60. "N A.Tic\jLA bo^eaJjIS, Kttetz. [Piauulariaborealis,^7?re;2&., TF. S?n. Brit. Dial. ii. p. 94; Bahh. Fl. Earop. Alg. i. p. 216.] Hah. "With tbe preceding species. 61. N. MESOLEPTA, EJirenb. [Pinnularia mesolepta, W. Sm. Brit. Diat. i. p. 58, t. 19. f. 182.] Hah. On bed of stream in crater of Grande Soufriere, Dominica. jS'o. 881. 62. FfitrsTULiA EHOMBOiDEs, D(9 Toui. {SyllogeAlgar. vol. ii. p. 227.) [Navicnla rhomboides, Ehrenh., W. Sm. Brit, Diat. i. p. 46, t. 16. f. 129.] Hah. In stream, crater of Grande Soufriere. No. 908. Yar. SAXONic.v, De Toni. (Z. c.) [Frustulia saxonica, Bahh. Navicula crassinervia, Breh. in JV. Sm. Brit. Diat. i. p. 47, t. .31. f. 271.] Hah. In streams (cold, warm, and hot), crater of Grande Soufriere, Domiuica. Nos. 883 and 908. — Also amongst mosses on trees, summit of Trois Pitons (4500 ft.), Dominica. IS'os. 903 and 904. 63. GoMPHOXEMA. TENELLUM, Kuetz. {W. Sm. Brit. Diat. i. p. 80, t. 29. f. 243.) Hah. On damp wall of dam. Sharp's Eiver, St. Yincent. No. 477. EXPLANATION OF THE PLATES. Plate XIIL Figs. 1-4. Zygneina (§ Zygogonium) pachydermum, n. sp. Conjugated spe- cimens, 520/1. 5-8. Ditto. Four zygospores, 520/1. 9, 10. Ditto. Two specimens, with azygospores, 520/1. 11-15. Ditto, sterile filaments; fig. 11, 520/1; figs. 12-15, filaments, showing short branches, 120/1. Fig. 16. Ditto, showing conjugation between three filaments, 120/1. Fig. 17. Cosmarium ohliquum, Nordst., f. minor, Nordst., 520/1. Plate XIY, Figs. 1-6. Zygnemapachydermum,T^.s^.,ydir-.confervoides,^.\Kr. Figs. 1&2, filaments without cell-contents ; fig. 3, filament with contents delineated ; fig. 4, attempt at conjugation ? ; fig. 5, cells showing longitudinal division. Figs. 1-5, .520/1 ; fig. 6, 830/1. 7-11. MicrochcBte tenuissirna, n. sp. 520/1. 12-15. Scyt&iiema javaniciim, Bornet. 520/1. 280 FEESHWATEll ALG^ FEOM THE WEST INDIES. Plate XIV. {continued). Fig. 16. Cerasterias staurastroides, n, sp. 520/1. Pigs. 17-24. Ekizoclonium Berggrenianum, Hauck, var. dominicense, n. Tar. 520/1. , Fig. 25. Cosmarium pseudojjyramidatum, Luud, * stenonotum, Nordst., f, minor, Racib. 520/1. Fig. 26. Glceothece linearis, Naeg., forma. 520/1. Plate XV. Figs. 1-3. Hapalosiplion arhoreus, n, sp. 520/1. 4-8. Stigonerna hormoides, Bornet et Flah., ysiY.'tcnue, n. var. 520/1. h, beterocysts. 9-10. Aphanocapsa elachista, n. sp. 520/1. 11-15. Scytonema amhiguum, Kuetz. 520/1. 16-28. Hapalosiphon intricatus, n. sp. 520/1. Plate XVI. Figs. 1-7. Symploca aisjndata, n. sp. Fig. 1, natural size ; fig, 2, a very small portion of cue of the erect fasciculi, 120/1 ; fig. 3, a specimen sbowing tbree tricbomes in one sheatb, 120y 1 ; figs. 4 & 5, examples witb two tricbomes in one sbeatb, 520/1 ; figs. 6& 7, tbe apices of two filaments, sbowing in fig. 6 a broad sbeatb at tbe apex, and in fig. 7 a narrow one, 520, 1. Fig. 8. Tetrapedia trigona, n. sp. 830/1. 9. Glceothece lunatum, n. sp. 520/1. 10. Eudorina stagnate, Wolle, var. 520/1. Figs. 11-13. Glaocapsa gigas, n. sp. 520,1. Fig. 11, an example Laving the cells with finely granulate walls ; fig. 12, one where tbe lamellte round the cells are not visible. 14-16. Scytonema amphim, n. sp. 520/1. Fig. 17. Chroococciis minor, Naeg. 520/1. 18. „ ,, ,, f. minima. 520/1. 19. „ schizodennaticiis, \\'est. 520/1. West Linn Soc Jolj-rn" J3ot Yv.l XXX. t'li^. C- c" West, I'lnal del J.Cart.er sc "ATest.llevOT.ar.S.C-m PRPSIivVATER ALGiE 0? WEST INDIES f W£3t. IinmSoc JoTO^^ BotVoi,:KXX.P1.14 G SW-sl.aim^ael. J Carter "Wesi ."Nevrman % C-faip 5RESHWATER ALGJ^ OF Ul ST INDIES liNM Soc Jouiog EoT Vol, JOQL PI .15, ;.S^.Vest..= aEat.arl J Carter--: FRESHWATLK ALG.^ OP Vv£ST IINDIES '.'fes't .T^ewioan 6rC°-imri. West LlNN SOC JGUKN -bOT A/OL XXXPl .16 GSl^TesI, ad nat. a^ J .C c Wes t, ."Newman & C ° i-m ^i . F R T-. S TT WA TlT.Tl AT .CW. OT AN^ K ST INI) i K S New York Botanical Card. QK572.W4 W4 West Wil iam/On some freshwater algae f snwater aig lllllll yc. 3 5185 00115 9217