Plants dark green to yellow-green, glossy or sometimes dull. Stems 2-6(-8) cm, 0.5-4 mm wide across leafy stem. Leaves 0.7-4 × (0.2-)0.4-2 mm; alar cells spheric, oval, quadrate, or rectangular, in 1-8 vertical rows, region triangular, or auriculate and oval; basal laminal cells shorter, broader than medial; medial cells 36-180 × 3-21 µm; apical cells often shorter. Specialized asexual reproduction by 2-7-celled propagula borne on branched stalks in leaf axils or in clusters without stalks on abaxial leaf surface. Seta yellow or orange to red-brown. Capsule yellowish, orange-brown, reddish, light brown, or dark red when mature, oblong to ovoid, smooth to striate, often wrinkled at neck, often contracted below mouth when dry; annulus differentiated; endostome cilia 1-3, usually as long as segments or nearly so, nodulose, rarely rudimentary or absent.
SELECTED REFERENCES Ireland, R. R. 1969b. A Taxonomic Revision of the Genus Plagiothecium for North America, North of Mexico. Ottawa. Ireland, R. R. 1986. Synopsis of the genus Plagiothecium for North America. Lindbergia 12: 49-56. Ireland, R. R. 1987. Scanning electron microscope study of the spores of the North American species of Plagiothecium. Mem. New York Bot. Gard. 45: 95-110.
'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.