Mnium Hedw., Sp. Musc. Frond. 188. 1801.
Medium-sized plants in dark-green or yellowish green tufts. Stems erect, simple, Mnium-type; reddish‑brown macronemata at base of stems, micronemata absent. Leaves spirally arranged, erect‑spreading to spreading, oblong‑elliptic, decurrent; margins multistratose, doubly toothed, bordered by linear cells; costae single, strong, subpercurrent to percurrent, usually toothed at back, with two stereid bands; upper cells hexagonal to isodiametric, firm‑walled, with or without thickened corners, smooth. Dioicous, paroicous, or synoicous. Setae elongate. Capsules exserted, horizontal to pendulous, oblong to cylindrical, smooth; stomata immersed in neck; opercula rostrate to mammillate; exostome of 16 narrowly triangular teeth, endostome basal membrane well-developed, segments perforate, cilia 2–4. Calyptrae cucullate, naked.