Monographs Details: Ceratodon
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 - Rather small plants in dense, dull tufts. Stems erect, simple or forked. Leaves contorted when dry, keeled, gradually acuminate, usually acute, sometimes ± awned; margins reflexed to revolute, notched or irregularly serrate near the tip; costa subpercurrent to excurrent, prominent at back; cells subquadrate, thick-walled, and smooth above, short-rectangular below. Dioicous. Perigonia swollen and conspicuous. Perichaetial leaves differentiated, sheathing. Setae erect, elongate; capsules suberect and nearly symmetric to strongly inclined and distinctly asymmetric, ± strumose at the base, ± sulcate w h en dry; annulus large and revoluble; operculum conic; peristome teeth 16, split nearly to the base into 2 terete divisions connected at the joints toward the base, bordered, papillose. Spores spherical. Calyptrae cucullate, smooth.
Asymmetric, ribbed capsules and connections between the forks of the peristome teeth are important features of the genus. The leaves have a considerable resemblance to some of the Pottiaceae (Barbula, for example) in shape, areolation, and revolution of margins, but the cells are not papillose. T h e tendency of the leaves to be keeled and the common excurrency of the costa (at least in C. purpureus) help in recognizing sterile specimens.
Reference maybe made to a recent revision of the genus b y Burley and Pritchard (1990).