Orthotrichum pilosissimum is described from herbarium material and recently collected specimens in the state of Nevada. Its specific epithet refers to the diagnostic hyper-developed axillary hairs, which are frequently longer than 1 mm, multiseriate and branched, covering most of the stems surface and sometimes protruding from the foliose shoots. These hairs are not only unique in the genus but also among mosses, providing a reliable diagnostic character for the new taxon. Additional gametophytic and sporophytic characters that contribute to its taxonomic delimitation are also given.
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1 June 2011
Orthotrichum pilosissimum (Orthotrichaceae), a new moss from arid areas of Nevada with unique axillary hairs
Rafael Medina,
Francisco Lara,
Vicente Mazimpaka,
James R. Shevock,
Ricardo Garilleti
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The Bryologist
Vol. 114 • No. 2
Summer 2011
Vol. 114 • No. 2
Summer 2011
desert bryophytes
Mosses
Orthotrichum bartramii
Orthotrichum norrisii
Orthotrichum tenellum
western North America