Plants very slender, in thin, + silky, green to brownish mats. Leaves rather remote, loosely spreading, 0.18--0.3 mm, narrowly lanceolate, gradually acuminate, not narrowed to the insertion, serrulate nearly all around but entire at the insertion; distal cells 3--6:1; alar cells scarcely differentiated. Specialized asexual reproduction absent. Sexual condition autoicous. Perichaetial leaves coarsely dentate above. Seta 4--9 mm. Capsule small, 0.4--0.45 mm, suberect or, more commonly, inclined or horizontal, broadly oblong-ovoid, asymmetric, without a neck, not contracted below the mouth when dry; annulus of 1 row of cells; operculum convex-conic, stoutly apiculate; stomata apparently none; peristome teeth yellowish; cilia of endostome well developed, single or paired. Spores 8--13 µm.

Rare; moist, shaded rock (limestone and sandstone); low to moderate elevations; Que.; Ark., N.J., N.Y., Ohio, Ind., Mass., Pa., Wis.

This species is rare, and occurs in thin, rather silky mats. The leaves are somewhat remote, loosely spreading when dry, and serrulate except near the insertion; the leaf cells are elongate, and those in the alar regions are scarcely differentiated.