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Published In: Annales Botanici Fennici 5(2): 145–147, f. 14–15, 20, 31–32, 35–36, 41, 43, 44, 47, 60, 69, 78, 81, 98, 100. 1968. (Ann. Bot. Fenn.) Name publication detail

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Acceptance : Accepted
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The circumscription of Plagiomnium used here follows Koponen (1968) which restricts the genus to those species of Mnium sensu lato having plagiotropic stolons, macro‑ and micronemata, a Bryum‑type stem epidermis, and unistratose bordered, singly toothed leaves (rarely entire on the stolon leaves). Plagiomnium with 24 species in 5 sections (T. Koponen 1968, 1981) is found throughout the world; the greatest concentration of Plagiomnium species is in Asia. Koponen (1979) treated the genus for Central and South America.


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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.

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