Barbula convoluta

Barbula convoluta, also called Streblotrichum convolutum, less commonly known as lesser bird's-claw beard-moss and Convoluted Beard Moss is a species of moss belonging the family Pottiaceae.^[2][3][4][5] The leaves are between 0.5 millimetres (0.020 in) and 1.5 millimetres (0.059 in) in length and are broadly lanceolate or more parallel-sided. The leaves become firm when wet. The stems are 1 to 1.5 centimetres (0.39 to 0.59 in). The seta is slender and yellow, and measured about 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), and the spores are smooth and measured about 10 to 12 micrometers.^[6][7] Capsules aren't common, but it can fruit abundantly with yellow setae and sheathing.^[8]

Barbula convoluta is very common and sometimes grows in great abundance. It is found in exposed sites, mainly in urban settings, on soil, sand, gravel, granite, bricks, walls, sandstone, limestone, dunes, paths and boulders.^[4][7] Associated mosses include Barbula unguiculata, Bryum argenteum, Ceratodon purpureus, and Tortula muralis.^[7]

• Barbula unguiculata