Monographs Details: Trematodon
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:Species Description - Plants small, gregarious to loosely tufted, light-green or yellowish. Leaves ± contorted when dry, oblong-ovate and clasping at base, gradually to abruptly narrowed to a lanceolate or subulate point; costa subpercurrent to excurrent; cells small, obscure, smooth, subquadrate to short-rectangular, longer at the base, not differentiated at basal angles. Setae elongate, straight or flexuose, yellow; capsules erect or curved, cylindric with a narrow neck as long as the urn or longer, often strumose at base; annulus simple or compound; operculum slenderly and obliquely long-rostrate; peristome lacking or single, with 16 undivided, perforate, or forked teeth, vertically barred-striate on the outer surface. Spores ± polygonal or reniform. Calyptrae cucullate, moderately inflated, smooth, naked.
The elongate seta, long, slender neck of the capsule, cylindric urn, differentiated operculum, and cucullate calyptra are distinctive. The peristome (when present) has vertically barred teeth.