Monographs Details: Ptychomitrium
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1)
Description:Genus Description - Plants small to fairly robust, in loose or dense, yellowish-, brownish-, or blackish-green cushions. Leaves erect with points curved, inrolled, or crisped when dry, spreading when moist, concave or keeled-concave and oblong-lanceolate from a broader, ± sheathing base, blunt or acute to acuminate; margins erect to incurved (or sometimes recurved below), entire to coarsely serrate above; costa ending at or near the apex; upper lamina often bistratose, sometimes in longitudinal streaks or only at the margins (if bistratose, sometimes roughened on 1 or both surfaces by bulging cells); upper cells rounded-quadrate; lower cells linear to laxly oblong or subquadrate to short-rectangular, those at the insertion broader and laxer, the alar cells not or ± differentiated. Autoicous. Perichaetial leaves not differentiated. Sporophytes single or clustered; setae straight; capsules oblong-ellipsoidal or cylindric; annulus none or variously developed; operculum slenderly long-rostrate and erect; peristome teeth variously perforate or irregularly split into 2-3 papillose divisions. Spores spherical. Calyptra mitrate, deeply lobed, sometimes scabrous at the apex, ± plicate, covering the upper half of the urn or sometimes the entire capsule.