in A. Gray, Manual, 647. 1848.
Plants very small, scattered or gregarious. Stems to 5 mm, erect, branches simple or branching. Leaves crispate to contorted when dry, erect-spreading when moist, oblong-lanceolate, 2–2.5 mm; margins serrulate distally; apices short-acuminate; costa single, percurrent; proximal laminal cells rectangular, distal cells rectangular to almost quadrate. Sexual condition autoicous. Seta erect, to 0.2 mm. Capsule stegocarpous, erect, immersed, symmetric, globose, to 0.7 mm, smooth; exothecial cells collenchymatous, particularly those adjacent to line of dehiscence; stomata at the very base of the capsule, superficial; annulus narrow, consisting of 1(–2) rows of delicate, small cells; operculum conical, short-apiculate, line of dehiscence equatorial, peristome absent. Calyptra mitrate, 4–6 lobed, small, smooth. Spores spherical, spiny-papillose.
e North America.