Monographs Details: Porotrichum
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)
Description:Genus Description - Plants moderately robust, usually ± shiny, green or yellow-green. Secondary stems erect, regularly to irregularly 1-2-pinnate, typically from a stipitate base; branches complanate-foliate or rarely somewhat terete. Stipe leaves small, scalelike, and appressed or more remote and appressed to squarrose or squarrose-recurved, triangular, acuminate. Frond leaves spreading and often complanate, oblong-ovate or oblong-ligulate, acute to broadly short-acuminate, sometimes apiculate; margins serrulate to coarsely serrate at the apex and often in the upper half, sometimes slightly inflexed on 1 side at base; costa angle, about 2/3-3/4 the leaf length, sometimes forked si at or near the tip; cells mostly smooth, subquadrate, hexagonal, oblong-rhomboidal, or linear (always shorter at the apex), with thin or thick, sometimes pitted walls; alar cells not or slightly differentiated. Dioicous. Perichaetial leaves sheathing, with narrow, spreading acumina. Setae elongate, smooth; capsules erect to slightly inclined, symmetric, oblong-cylindric, smooth; annulus broad; operculum as long as the urn or longer; peristome teeth lanceolate, striolate at base, papillose above, trabeculate at back; segments arising from a high basal membrane, lance-subulate, keeled, ± perforate, papillose, the cilia paired, short or obsolete to about as long as the segments. Calyptrae cucullate, usually naked.