Monographs Details: Trachypus
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 slender to fairly robust, in dense, dull, green, yellow, or brown mats, usually black-tinged. Stems spreading or ± pendent, freely and irregularly branched. Leaves loosely erect or ±spreading, rather rigid and plicate when dry (and sometimes ± crisped at the tips), rather broadly long-acuminate from a broadly oval base, often auriculate at the basal angles; margins not bordered, generally serrulate to serrate; costa extending well beyond the leaf middle; cells elongate, thick-walled, densely and finely papillose over the lumen and also over adjoining walls, the mid-basal cells linear and smooth, a few in the small auricles± rounded. Setae up to 2 cm long, hispidulose; capsules erect, subglobose, blackish; operculum obliquely long-rostrate; exostome teeth pale, narrowly lance-acuminate, papillose; endostome much shorter, with a low basal membrane, ± rudimentary, unkeeled segments, and no cilia. Calyptrae cucullate or narrowly mitrate, densely hairy.

Discussion:The plants resemble Papillaria but are more rigid when dry, with plicate leaves and leaf cells densely papillose over both lumina and walls. The finely brisUed seta, erect, subglobose capsule, and slenderly conic-rostrate operculum are also distinctive.