Plagiomnium T. Kop., Ann. Bot. Fenn. 5: 145. 1968.
Plants in dark-green or yellowish
green tufts. Stems erect, simple, Bryum-type (Koponen 1968),
plagiotropic shoots usually present; macronemata and micronemata rhizoids
present. Leaves spirally arranged, erect‑spreading to spreading, obovate‑elliptic,
oblong, elliptic, decurrent; apices acute to apiculate; margins uni‑stratose
(occasionally, bi‑ or multistratose), singly toothed, bordered by long,
linear cells (occasionally elimbate); costae single, strong, subpercurrent to
percurrent, smooth at back, with one stereid band (occasionally absent); upper
cells hexagonal, rounded hexagonal to elongate, firm‑walled, with or
without thickened corners, smooth. Dioicous or synoicous. Setae single or
multiple. Capsules exserted, horizontal to pendulous, oblong to cylindrical;
stomata in neck or urn; opercula rostrate to mammillate; peristome double,
exostome of 16 narrowly triangular teeth; endostome with basal membrane
well-developed, segments perforate, cilia 2–4. Calyptrae cucullate, naked.