Authors: Richard E. Andrus

Plants moderate-sized and fairly strong-stemmed; green, yellow to yellowish brown; capitulum 5-radiate in shade forms to hemispherical in open grown or drier growing forms. Stems pale green to pale brown, sometimes with red branch bases; superficial cortex of 2 layers of enlarged, clearly differentiated and thin-walled cells. Stem leaves triangular to lingulate-triangular, 0.8--1.3 mm; typically appressed; apex acute to apiculate; hyaline cells efibrillose and nonseptate to rarely septate. Branches straight and somewhat tapered, usually 5-ranked; leaves little elongate at the distal branch end. Branch fascicles with 2 spreading and 2--3 pendent branches. Branch stems green$ but often reddish at proximal end, with cortex enlarged with conspicuous retort cells, Branch leaves ovate to narrowly ovate-lanceolate; (1.1)1.4--1.8(--3.1) mm; slightly undulate and sharply recurved when dry, somewhat subsecund; margins entire; hyaline cells on convex surface with usually 1 round pore on apical end, on concave surface with wall thinnings in the cell ends and angles; chlorophyllous cells broadly triangular in transverse section and very deeply enclosed on the concave surface. Sexual condition dioicous. Spores 19--25 µm; finely papillose on both surfaces.

Forested and open poor fen habitats where it often occurs as a ruderal species in extensive mats; B.C.; Alaska, Ore., Wash.

Sporophytes are uncommon. See discussion of S. brevifolium. Characters of the spores from K. I. Flatberg (1989).