带藓科 dai xian ke
by Jia Yu
Plants usually rigid, yellowish green, glossy, in loose mats. Primary stems slender, elongate, prostrate, with scale-like leaves; rhizoids at the base; secondary stems without rhizoids, simple or irregularly branched, leafy branches strongly complanate; a central strand absent; paraphyllia none; pseudoparaphyllia often present, filamentous. Leaves clearly arranged in 2 ranks, elongate-ovate or elongate-lingulate, strongly concave; margins plane, usually entire; costae short, weak, single or forked, or absent; leaf cells narrowly rhomboidal, smooth, thin-walled. Gemmae sometimes present, multicellular. Dioicous. Perichaetia and perigonia terminal on lateral branches. Perichaetial leaves differentiated, smaller than vegetative leaves. Setae very short or elongate; capsules immersed, emergent, or exserted, ovoid, erect, light brown or brown, apophyses not or slightly differentiated; opercula large, conic, shortly straight-rostrate or obliquely long rostrate; annuli not differentiated; peristome single or double, prostome sometimes present; exostome teeth narrowly lanceolate, trabeculate and irregularly perforate on the outside; endostome segments rudimentary or reduced. Calyptrae large, mitrate or cucullate, with numerous long hairs. Spores spherical, in various sizes, finely papillose.