Plants very small, growing from an abundant protonema. Stems simple, rounded in section, consisting of uniform cells (epidermis, cortex and central strand not differentiated); axillary hairs consisting of 4 uniseriate cells, hyaline except for the shorter, yellowish basal cells. Leaves few, larger and crowded above, plane to broadly concave, oblong-lanceolate to long-lingulate, acute, scarcely differentiated at base; margins plane to broadly incurved, undulate, irregularly dentate to serrulate in the upper half; costa strong, ending 2-4 cells below the apex, with 2 stereid bands and 2-4 guide cells in 1 layer; upper cells papillose; lower cells differentiated across the leaf base. Dioicous; perichaetia terminal, the inner bracts little differentiated. Setae very short, yellow-green; capsules globose, conic-apiculate, lacking an operculum, peristome, and columella; exothecial cells smooth or somewhat protuberant because of central lens-like thickenings. Calyptra covering 1/3-1/2 the capsule, campanulate, 4-5-lobed, with cells mammillose-bulging (especially on the lobes).