Leptotheca Schwaegr., Sp. Musc. Frond. Suppl. 2(1): 135. 1824.
Aulacomnium sect. Leptotheca Mitt., J. Linn. Soc., Bot. 12: 316. 1869.
Plants dull or glossy, yellow‑green to brown, in dense tufts. Stems erect, simple; reddish rhizoids densely matted in lower _. Leaves spirally arranged, stiffly erect, erect‑patent to spreading when dry, patent when wet, linear to ovate‑lanceolate or oval, decurrent; apices acute to long‑acuminate; margins plane to recurved below, unistratose, singly toothed, elimbate; costae single, strong, excurrent, toothed at back; upper cells irregularly shaped, isodiametric, hexagonal, rhomboidal, or elongate, thick‑walled, smooth. Uniseriate propagula in upper leaf axils. Dioicous. Setae elongate. Capsules erect to somewhat curved, long‑cylindrical, furrowed; stomata phaneroporic at base of urn; opercula bluntly conic; annuli of 2–3 rows of enlarged, thin‑walled cells; exostome of 16 narrowly triangular teeth, endostome basal membrane well-developed, segments not perforate, cilia 2. Calyptrae cucullate, naked.