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Barbula unguiculata
Also called Bird's Claw Beard Moss, Prickly Beard Moss
Barbula unguiculata, also called as Bird's-claw Beard-moss is a species of moss belonging to the family Pottiaceae. Its color is usually distinctive, a kind of bright yellow-green shared by few similar acrocarps such as Trichostomum species. Its leaves always look opaque, thanks to its densely papillose leaf cells. In dry conditions, the leaves frequently twist or curl around the stem, whereas they spread outward when moist. Each leaf is parallel-sided for most of its lengths.
The stems of Barbula unguiculata typically reach lengths of approximately 1 to 2 millimetres (0.039 to 0.079 in), while the leaves generally measure between 1 and 2.5 millimetres (0.039 and 0.098 in) in length. The seta of Barbula unguiculata is 1 to 2.5 centimetres (0.39 to 0.98 in), and the spores are 8 to 11 μm. Capsules mature in winter and early spring, occasionally summer or fall.
Barbula unguiculata typically colonizes open, exposed and disturbed sites, on soil, sand, gravel, sandstone, granite, limestone, walls, roadcuts, paths, lawns, ditches, boulders, and cliff crevices, and low to high elevations (50-2700 m). It is frequently found on eutrophic grounds, such as sidewalks and arable fields.
Text excerpted from the Wikipedia article Barbula unguiculata by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
