Sapjegin, Bot. Jahrb. Syst. 46: 10. 1911.
in dense tufts, light green to yellowish green, glossy.
0.5-3 cm, tomentose below with whitish or reddish brown rhizoids.
straight, erect-spreading, little changed when dry, smooth, 4-6 × 0.2-0.4 mm, most of the leaf tips deciduous and absent, lanceolate, concave proximally, tubulose distally, apex acute; margins entire or serrulate at apex; laminae 1-stratose or with 2-stratose regions near apex; costa long-excurrent,
/4 the width of the leaves at base, abaxial ridges absent; leaf cells smooth, with a row of guide cells, no stereid bands, 1 or 2 rows of cells above and below guide cells with slightly thickened walls and large lumens, the adaxial and abaxial epidermal layers of cells not differentiated; cell walls between lamina cells not bulging; alar cells 1-stratose, differentiated, not extending to costa; proximal laminal cells rectangular to linear, with a few pits, (46-)60-105(-120) × (4-)6-16(-22) µm; distal laminal cells quadrate, rounded or short-rectangular, not pitted, (12-)17-25(-32) × (8-)10-11(-12) µm.
dioicous; male plants as large as females; interior perichaetial leaves gradually narrowed to a subulate apex, convolute-sheathing.
1.5-2.5 cm, solitary, yellow to light brown.
1.4-2.5 mm, straight and erect, smooth, often irregularly wrinkled when dry, yellow to light brown; operculum 1-1.8 mm.
Capsules mature in summer. Frequently on rotten logs, stumps, or tree bases in woodlands, sometimes on humus or humus over rock; 150-2200 m; Alta., B.C., N.W.T., Sask.; Alaska, Calif., Colo., Idaho, Mont., Nebr., Oreg., S.Dak., Utah, Wash., Wyo.; Europe.
has been reported from Utah by S. Flowers (1973). It is a western North American species, occurring on trees and rotten wood. It is recognized as glossy plants with broken off leaf tips and straight, erect capsules. It can be confused with
, which also has broken off leaf tips and whose range overlaps with
. For distinctions see discussion under 21.