毛藓科 mao xian ke
by Jia Yu
Plants large to robust, more or less glossy, in loose mats. Primary stems thick, elongate, prostrate, forming stoloniferous stems, with dense brownish rhizoids; secondary stems erect, simple or densely irregularly branched; paraphyllia present; a central strand differentiated or absent. Leaves crowded, appressed or contorted when dry, fragile, erect-spreading or almost squarrose when moist, elongate-ovate-lanceolate, concave or undulate, short or narrowly long acuminate; margins plane, entire or irregularly dentate; costae single, percurrent or ending below the apex; upper leaf cells rounded-quadrate or oblong, sometimes rectangular, smooth or papillose, gradually elongate or narrowly elongate toward the base, smooth; alar cells differentiated, consisting of several rows of oblong or quadrate cells. Autoicous or dioicous. Perigonia large, bud-like, axillary. Perichaetia on terminal short branches; perichaetial leaves differentiated. Setae elongate, mammillose; capsules erect, symmetric, smooth; opercula conic, obliquely short-rostrate; annuli differentiated; stomata present at apophyses, superficial; peristome double or single; exostome teeth well developed, with a zigzagged median line on the outer surface, trabeculate on the inner surface, densely coarsely papillose; endostome segments often reduced; basal membrane low; cilia absent. Calyptrae cucullate, naked. Spores spherical, minutely papillose.