7. Crossidium Jur. 流梳藓属    liu-shu xian shu

Laubm.-Fl. Oesterr.-Ung. 127. 1882, nom. cons.

 

Plants tiny, yellowish green to reddish brown, in low gregarious or thin tufts. Stems very short, mostly buried in soil, simple; central strand present. Leaves imbricately appressed when dry, slightly spreading when moist, broadly ovate to rounded ovate or shortly triangular, concave, abruptly to broadly acute at the apex; costa slender, shortly excurrent as an apiculus or excurrent in a short, smooth, hyaline awn; superficial cells of upper ventral costa forming a group of separate, often branching, filaments; in cross section a dorsal stereid band present; margins entire, incurved; upper leaf cells subquadrate to rounded elliptic, thick-walled, without papillae or papillose; basal cells rectangular, thin-walled. Dioicous or monoicous. Outer perichaetial leaves similar to stem leaves, inner perichaetial leaves smaller. Setae elongate, slender, more or less straight; capsules oblong-ovoid, erect or curved; annuli differentiated, of 3 rows of cells, persistent or deciduous; peristome teeth 16, divided into 32 linear-lanceolate segments, papillose, twisted counterclockwise, rarely straight; opercula conic, obliquely short-rostrate. Calyptrae cucullate, smooth. Spores small, spherical, yellowish brown, smooth or finely papillose.