Spence, J.R. 2013. A new combination in Ptychostomum (Bryaceae, Bryophyta) for Brym subneodamense Kindb.
Phytoneuron 2013-3: 1. Published 9 January 2013. ISSN 2153 733X

A NEW COMBINATION IN PTYCHOSTOMUM (BRYACEAE, BRYOPHYTA)
FOR BRYUM SUBNEODAMENSE KINDB.

JOHN R. SPENCE
National Park Service, Glen Canyon National Recreation Area

Page, Arizona 86040-1507
John_Spence@nps.gov

ABSTRACT
Ptych E i (Kindb.) J.R. Spence is provided as a new name for a
combination in the moss genus Ptychostomum Hornsch. for Bryum ovatum Jur. in lieu of the blocking
name Ptychostomum ovatum J.R. Spence.

KEY WORDS: Ptychostomum, Bryaceae

The species Brywm ovatum Jur. (1882) is an illegitimate name, being a later homonym of
Bryum ovatum (Hedw.) Dicks. ex With. (1801). Spence (2007) intended to transfer Bryum ovatum
Jur. to the the genus Ptychostomum, but an inadvertent error listed the basionym as Gymnostomum
ovatum Hedw., the same as that of Bryum ovatum (Hedw.) Dicks. ex With., a different species.

Given that Ptychostomum ovatum (Hedw.) J.R. Spence is a homotypic synonym of
Pterygoneurum ovatum (Hedw.) Dixon and blocks a transfer of Brywm ovatum Jur., the next available
name for the taxon is Brywmn subneod Kindb., a heterotypic synonym of Brywm ovatum Jur.

The appropriate and correct binati in Ptych for the species under
consideration is made here, showing the nomenclatural history in outline form.

PTYCHOSTOMUM SUBNEODAMENSE (Kindb.) J.R. Spence, comb. nov. Basicnym: ee
subneodamense Kindb., Rev. Bryol. 32: 34. 1905. Bryum i var.
(Kindb.) Podp., Bryum Gen: Monog. Prodr. 16: 57. 1973.

Bryum ovatum Jur., Laubm.-F1. Oesterr.-Ung. 291. 1882 [not Brywm ovatum (Hedw.) Dicks. ex With.
1801]. Transfer to Ptychostomum blocked by Ptychostomum ovatum (Hedw.) J.R. Spence.

The species typified by Gymnostomum ovatum Hedw. is currently treated within the genus
Pterygoneurum. Pertinent synonyms are given here.

Pterygoneurum ovatum (Hedw.) Dixon, Rev. Bryol. Lichénol. 6: 96. 1934. Ptychostomum ovatum
(Hedw.) J.R. Spence, Phytologia 89: 113. 2007. Gymnostomum ovatum Hedw., Sp. Musc.
Frond. 31. 1801. Brywn ovatum (Hedw.) Dicks. ex With., Syst. Arr. Brit. Pl. (ed. 4) 3: 795.
1801.

LITERATURE CITED
Spence, J.R. 2007. Nomenclatural changes in the Bryaceae (Bryopsida) for North America IL.
Phytologia 89: 110-114.