18. Microctenidium Fleisch. 小梳藓属 xiao shu xian shu
Musci Buitenzorg 4: 1464. 1923.
Plants slender, yellowish green or golden yellow, glossy, often in flattened and dense mats. Stems prostrate, radiculose, pinnately branched, branches short. Stem leaves reflexed above, broadly ovate at base, abruptly narrowed to a very slender or filiform apex; margins serrulate; branch leaves longer, suberect, narrowly ovate at base, gradually lanceolate above, concave; margins recurved below, distinctly serrate; costae absent; leaf cells elongate rhomboidal, sometimes prorate. Autoicous or dioicous. Inner perichaetial leaves ovate and somewhat sheathing at base, abruptly filiform and laciniate above. Setae elongate, smooth; capsules nearly erect, symmetric, oblong-ovoid; opercula conic, shortly rostrate; annuli differentiated; peristome single due to undeveloped endostome; teeth lanceolate, hyaline, trabeculate on the inner surface. Calyptrae cucullate, somewhat hairy. Spores large, spherical, yellowish, minutely papillose.