Consortium of Bryophyte Herbaria - Pterygoneurum subsessile

Pterygoneurum subsessile (Brid.) Jur.
Family: Pottiaceae California pterygoneurum moss, more...sessile pterygoneurum moss [Anictangium subsessile (Brid.) Grev. & Arn., more]	Flora of North America Flora of North America Resources Richard H. Zander in FNA Volume 27 Pterygoneurum subsessile Leaves: with distal lamina smooth; awn smooth or sharply serrulate; lamellae 10–12 cells in height, not lobed, sometimes bearing filaments. Capsule: stegocarpous (or stegocarpous but bursting irregularly), immersed to emergent, short-ovoid, annulus present, operculum cells in straight rows; eperistomate. Calyptra: mitrate. North Temperate Zone, s South America. Varieties 2 (2 in the flora). Pterygoneurum subsessile is an abundant moss in the arid West, often occurring with P. ovatum. In some specimens, the perigoniate plants appear separate, but this species and doubtless others are apparently occasionally rhizautoicous. Following the reasoning of R. T. Wareham (1939), var. henrici is placed with the typical variety. The characters associated with P. californicum (H. A. Crum 1967) are poor: the spores are finely papillose, the leaf cells do have weak collenchymatous thickenings, and the calyptra is long-mitrate. Richard H. Zander in FNA Volume 27 Pterygoneurum subsessile var. subsessile Capsule: stegocarpous, spores released after operculum falls. Phenology: Spores mature late winter–spring. Soil (sandy, volcanic), alkali flats. moderate to high elevations (600-1700 m). Alta., B.C., Sask., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Ill., Iowa, Kans., Minn., Nebr., Nev., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah, Wyo., s South America, Europe, Asia, n Africa. Discussion.
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