Plants robust, stiff; green, pale green, yellow-green; large terminal bud; typically as loose carpets in coniferous forests. Stem green to red-brown; 2-3 superficial cortical layers. Stem leaves shorter than branch leaves, ovate-lingulate to oblong-lingulate, 1.6-1.8 × 1-1.2 mm; hyaline cells mostly nonseptate. Branches long and tapering with distinct squarrose spreading leaves, often terete in tundra forms. Branch fascicles with 2 spreading and 2-3 pendent branches. Branch stems with 1-2 layers of cortical cells. Branch leaves larger than stem leaves, 1.9-2.8 mm, conspicuously squarrose from ovate-hastate base and abruptly narrowed 1/2-1/3 distance from apex into involute-concave acumen, often terete in tundra forms; hyaline cells convex on both surfaces, non-ringed pores at ends and corners of cells, ringed pores on concave surface (4-8/cell) and nonringed pores (2-4/cell) on convex surface, internal commissural walls smooth or indistinctly papillose, chlorophyllous cells ovate triangular with widest part at or close to the convex surface. Sexual condition monoicous. Spores 17-30 µm; proximal surface finely papillose, distal surface smooth with raised bifurcated Y-mark sculpture; proximal laesura more than 0.5 spore radius.
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