About Streblotrichum convolutum (Hedw.) P.Beauv.
Streblotrichum convolutum (Hedw.) P.Beauv., also widely known as Barbula convoluta, and less commonly called lesser bird's-claw beard-moss and Convoluted Beard Moss, is a species of moss in the family Pottiaceae. Its leaves range in length from 0.5 millimetres (0.020 in) to 1.5 millimetres (0.059 in), and are broadly lanceolate or more parallel-sided. The leaves become firm when wet. Stems grow 1 to 1.5 centimetres (0.39 to 0.59 in) long. The seta is slender and yellow, and measures approximately 1 to 1.8 centimetres (0.39 to 0.71 in). The theca is 0.8 to 1.2 millimetres (0.031 to 0.047 in) long. Spores are smooth and measure about 10 to 12 micrometers. Capsules are not common for this species, but when it fruits, it can fruit abundantly, producing yellow setae with sheathing. This moss is very common and sometimes grows in great abundance. It occurs in exposed sites, mainly in urban settings, growing on substrates including soil, sand, gravel, granite, bricks, walls, sandstone, limestone, dunes, paths, and boulders. Moss species that are commonly associated with it include Barbula unguiculata, Bryum argenteum, Ceratodon purpureus, and Tortula muralis.
