Plants in loose tufts, dark green above, blackish green below, dull. Stems 1.5-3.5 cm, sparsely tomentose with light-to reddish brown rhizoids. Leaves erect-spreading, some weakly falcate-secund, crisped when dry, smooth, (3-)4-5(-7) × 0.5-0.8 mm, some leaf tips broken off, concave below, subtubulose above, narrowly lanceolate to a long, narrow subula occupied mainly by the excurrent costa, apex acute; margins serrate to serrulate in distal half; laminae 1-or 2-stratose above, sometimes 2-stratose in patches; costa excurrent, 1/4-1/3 the width of the leaves at base, abaxially toothed or papillose in distal half, abaxial ridges absent, with a row of guide cells, two stereid bands not extending above the leaf middle, adaxial and abaxial epidermal layers of cells somewhat differentiated or with a few cells enlarged in both layers, cell walls between lamina cells strongly bulging in distal part of leaf lamina; leaf cells smooth or abaxially prorate above; alar cells mostly 1-stratose or sometimes with a few 2-stratose cells, distinctly differentiated, often extending to costa; proximal laminal cells elongate-rectangular, not pitted or with few pits, (19-)24-33(-42) × (4)5-6(9) µm; distal laminal cells regularly quadrate to short-rectangular, not pitted, (5-)10-11(-16) × (4)5-6(9) µm. Sexual condition dioicous; male plants as tall as female plants but usually more slender; interior perichaetial leaves abruptly long-acuminate, convolute-sheathing. Seta 1-2 cm., solitary, brown or reddish brown. Capsule 1.5-3 mm, straight and erect, smooth, slightly furrowed when dry, reddish brown; operculum 1.5-2 mm. Spores 14-28 µm.
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