8. Desmatodon Brid. 链齿藓属 lian-chi xian shu
Muscol. Recent. Suppl. 4: 86. 1819 .
Plants small, green, yellowish green to yellow, in low loose tufts. Stems short, usually simple, rarely branched; central strand present, rarely absent. Leaves usually flexuous or curved-contorted when dry, erect-spreading when moist, often concave or keeled-concave, broadly ovate, narrowly obovate or oblong- to ovate-lanceolate, acute, obtusely pointed or apiculate to hair-pointed at the apex; margins mostly entire, revolute below, plane, serrulate above, sometimes borders differentiated by linear cells near leaf bases, but by short, incrassate cells in the upper margins; costa percurrent to excurrent, or ending in a hairy awn, smooth or papillose; in cross section dorsal stereid band present; upper leaf cells orderly arranged, quadrate to hexagonal or oblong-hexagonal, thin-walled, with multiple C-shaped papillae, or occasionally smooth; basal cells larger, lax, irregularly rectangular, smooth, hyaline. Autoicous. Perichaetial leaves not much differentiated from stem leaves. Setae elongate, straight, twisted or cygneous, smooth; capsules usually erect, symmetric, ovoid- to oblong-cylindrical; annuli developed, deciduous or persistent; peristome teeth nearly erect, occasionally twisted once, short and flat, rather broad, lanceolate, with a low basal membrane, usually divided 2–3 times, densely papillose, rarely peristome rudimentary or absent; opercula conic, obliquely short- to long-rostrate. Calyptrae cucullate, smooth. Spores rather large, spherical, yellow or reddish brown, mostly coarsely papillose.