Monographs Details: Zygodon
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, small to moderately robust, in light- to olive-green mats or tufts, or sometimes scattered among other mosses, on trees or rocks. Stems erect-ascending, simple or forked, ± covered with a red-brown tomentum. Brood bodies ellipsoidal to cylindric, septate, axillary or on rhizoids. Leaves imbricate to irregularly twisted or curved around stems and branches and sometimes undulate when dry, erect-spreading to squarrose-recurved when moist, 0.7-2.5 mm long, keeled, ovate- to linear-lanceolate, acute to rounded-obtuse, often apiculate, sometimes decurrent; margins entire or ± denticulate near the apex, plane or reflexed; costa ending at or near the apex, rarely excurrent; upper cells rounded-hexagonal to subquadrate, ± thick-walled, densely pluripapillose or rarely unipapillose; basal cells quadrate to rectangular, thin-walled, smooth, usually yellowish. Perigonia budlike, sometimes stalked. Perichaetial leaves usually undifferentiated. Setae ± elongate; capsules exserted, about 0.7-2.5 mm long, oblong-ellipsoidal to fusiform, strongly 8-ribbed, not or somewhat contracted below the mouth, tapered to the seta through a long neck; operculum usually long-rostrate; stomata superficial, in the lower portion of the urn and the neck; peristome single, double, or none; exostome teeth partially or wholly united in 8 pairs, papillose to papillose-striate, without a preperistome, erect to recurved, sometimes consisting of a low papillose membrane; endostome segments (if present) 8, slender, smooth, papillose, or striate. Spores small, smooth to papillose. Calyptrae long-conic, cucullate, naked, usually smooth.