Plants in dense flat mats, blue-green to black-green. Stems 0.5-1 cm, central strand weak. Leaves lanceolate from a broad base, 0.8-1.3 × 0.2-0.5 mm, keeled, weakly to rarely strongly plicate distally [often strongly plicate in Eurasian specimens], margins plane proximally, incurved distally, cucullate, awn 0.1-0.5 mm, often muticous, costal transverse section prominent, semicircular; basal juxtacostal laminal cells quadrate to short-rectangular, straight, thin-walled; basal marginal laminal cells short-to long-rectangular, straight, thick transverse and thin lateral walls, not hyaline; medial laminal cells rounded-quadrate, thick-walled; distal laminal cells 2-stratose, bulging, marginal cells 2-stratose, bulging. Sexual condition dioicous, perichaetial leaves not enlarged. Seta straight, 1.8-2.4 mm. Capsule occasionally present, exserted, yellow, cylindric, exothecial cells short-rectangular, thin-walled, stomata present, annulus of 1 row of quadrate, thick-walled cells, operculum mammillate, peristome present, fully-developed, solid in distal half.
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