Monographs Details: Amphidium
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, light- to yellow-green above, darker and olive-green or brownish below, in dense, dull to somewhat lustrous cushions. Stems erect, repeatedly forked, radiculose below. Leaves crowded in ± spiral rows, crisped, and contorted when dry, flexuose-spreading to loosely wide-spreading when moist, keeled, linear to linear-lanceolate, narrowly acute; margins irregularly recurved on 1 or occasionally both sides below, sometimes also above the middle; costa ending near the apex; upper cells rounded-quadrate or rounded-hexagonal, thick-walled, minutely pluripapillose; basal cells rectangular, hyaline or yellow, thin- or thick-walled, sometimes faintly and minutely papillose-striolate. Perichaetial leaves not much differentiated or broad, short-pointed, entirely sheathing, and pale; cells ± elongate and smooth or somewhat papillose. Setae short, erect or curved; capsules emergent to shortly exserted, erect and symmetric but the mouth often slightly oblique, obovoid to ovoid-oblong and wide-mouthed from a short, broad neck, becoming oblong-urceolate and strongly 8-ribbed when dry and empty, dark-brown; annulus and peristome none; exothecial cells differentiated along the ribs in about 8 rows; stomata superficial; operculum apiculate or obliquely rostrate. Spores spherical. Calyptrae cucullate, smooth, naked.