Flora of North America, Volume 27, 2007
626 POTTIACEAE · Syntrichia Sexual condition dioicous. Seta 6–15 mm, brown. Dry soil, rock; moderate to high elevations; B.C.; Ariz., Capsule red, 2.5–3.2 mm, straight or slightly curved, with Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, a distinct neck; operculum 1.5–2mm, red; peristome 0.7– Wash.; Mexico (Coahuila, Nuevo León); s Europe; c Asia. 1 mm, the basal membrane about 1/2 the total length. Syntrichia papillosissima is primarily a species of the Spores 7–8 µm, lightly papillose. Great Basin Desert north into the shrub-steppe ecosystems Soil, deserts and steppe, often forming extensive of the Columbia Basin, where it often occurs as a co- carpets; moderate to high elevations; Alta., B.C.; Ariz., dominant with S. ruralis and S. caninervis. It is similar Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, to a robust S. ruralis, differing most conspicuously in the Wash., Wyo.; s, sw Asia (Afghanistan, Iran, Lebanon, extremely tall mammillae on the distal leaf cells, each Russia, Turkey); n Africa. crowned by only one or two papillae, unlike the shorter Syntrichia caninervis is most common in the colder bulging cell surface bearing four or five papillae deserts and steppes of the flora area, particularly in the characterizing other species in the S. ruralis complex. Mojave and Great Basin deserts and the Columbia Basin. Syntrichia papillosissima also has larger distal laminal It can be confused in the field with S. ruralis, but good cells, which are more pellucid than those of S. ruralis. field distinctions for S. caninervis include the blackish or olive green color, the imbricate, weakly twisted leaf stance 16.
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