Pterobryaceae

Diagnosis: Plants medium-sized, in loose, dull or somewhat shiny, yellow-green or brownish mats. Secondary stems erect-ascending, straight or curved, simple or sparsely branched, up to 3 cm long, often bearing filiform, septate brood bodies in leaf axils. Leaves crowded, loosely appressed and wrinkled or ± plicate when dry, erect spreading when moist, somewhat concave, 1-2 mm long, oblong-ovate or oblong-lanceolate, acute or gradually acuminate; margins revolute nearly to the apex, entire or crenulate at the apex; costa single, slender, ending at or above midleaf; cells linear-flexuose, with 1 or sometimes 2-4 papillae on both surfaces or rarely smooth, small and subquadrate in numerous rows at the basal angles. Setae 4-6 mm long, straight or slightly flexuose, smooth; capsules exerted, erect and symmetric, oblong-cylindric ca. 2 mm long; exostome with a well developed prostome; endostome smooth, with a low basal membrane, perforate, almost as long as the teeth.