Mnium cinclidioides Huebener, Muscol. Germ., 416. 1833; Plagiomnium cinclidioides (Huebener) M. C. Bowers

Plants large, often growing with other bryophytes. Leaves with apiculus blunt or sharp; medial laminal cells with tapered ends, slightly smaller near margins. Capsule with annulus 2- or 3-seriate, revoluble; endostome cilia in groups of 2-4.

Capsules mature summer. Moist soil or humus in swamps, fens, wet meadows, streams, wet depressions in forests, boulders, tree roots; Greenland; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon; Alaska, Conn., Maine, Mass., Mich., Minn., N.H., N.J., N.Y., Pa., Vt., Va., W. Va.; Europe; Asia.

Pseudobryum cinclidioides is uncommon but one of the species easiest to recognize in Mniaceae. The broad, often green or yellow-green leaves with indistinct borders and elongate, Bryum-like laminal cells usually in diagonal rows are distinctive. The large laminal cells make it readily identifiable in the field with a hand lens.