Monographs Details: Leucomium
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 - Slender, pale, yellowish to whitish-green, sometimes slightly shiny plants. Stems creeping, irregularly branched; epidermal cells smaller than inner cells. Leaves lanceolate, slenderly acuminate, ecostate, entire, lateral leaves loosely complanate and often subsecund when dry, spreading to wide-spreading, ± asymmetric, dorsal and ventral leaves obhquely erect, symmetric; cells long-rhomboidal, lax, thin-walled, pellucid, smooth. Perichaetial leaves elongate, spreading-subulate from a ± sheathing base. Setae reddish, slender, flexuose, somewhat roughened at the extreme apex; capsules horizontal to pendulous, dark-red, oblong-ovoid, symmetric, contracted below the mouth and at the neck when dry, obscurely pustulate at the extreme base, otherwise smooth; annulus none but several rows at base of the operculum sometimes pale and thin-walled; operculum slenderly long-rostrate; exothecial cells not or slightly collenchymatous. Calyptrae naked or sparsely hairy.
The genus has recently been revised by Allen (1987).