Monographs Details: Aulacomnium
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 and slender to coarse and robust, in dull, yellow-green, yellow-brown, or green, radiculose tufts. Leaves crowded, erect or erect-spreading, scarcely altered to strongly contorted on drying, oblong-lanceolate to oblong-ovate or elliptic, acute to obtuse or rounded, sometimes apiculate, not or somewhat decurrent, concave or keeled; margins entire or toothed above, usually ± revolute; costa tapered, usually flexuose above, typically ending somewhat below the apex; cells rounded, shortly oblong, or elliptic, ± thick-walled, scarcely differentiated to somewhat elongate below, sometimes colored and ± swollen at the insertion. Setae erect, smooth; capsules suberect or inclined to horizontal, subcylindric from a short neck, asymmetric and usually somewhat curved, contracted below the mouth when dry, ribbed; annulus revoluble; operculum bluntly conic to stoutly and obliquely rostrate; exostome teeth lance-acuminate, yellow to brown, densely papillose; endostome finely papillose, with a high basal membrane, keeled and mostly gaping segments, and long, ± nodulose cilia in groups of 2-4 (rarely 5). Spores spherical. Calyptrae cucullate, smooth, naked.
The genus can be characterized by plicate capsules, a well-developed bryoid peristome, and short leaf cells.