Bryol. Univ.2: 95. 1827 ,
Worldwide in arctic and subarctic areas.
Species 2 (2 in the flora).
Psilopilum is a small genus of pioneer mosses on soil in disturbed or otherwise unstable, non-calcareous sites, in arctic and subarctic North America and Eurasia. The closest affinities of Psilopilum are with Atrichum, as indicated by the tendency towards bordered leaves (P. laevigatum), finely longitudinally striate exothecium, and a similar peristome of 32 linear, crowded teeth. Sporophytes are commonly produced in both species. The best recent treatment is that of D. G. Long (1985), who examined an extensive series of collections from arctic America.
|1||Leaves oblong-ovate, erect-appressed when dry, spreading when moist; leaf margins entire or minutely denticulate near apex; lamellae entire or crenulate in profile; capsule cylindric, weakly to moderately curved, not or weakly gibbous, suberect or inclined.||Psilopilum cavifolium|
|1||Leaves ovate to oblong-obovate, erect-incurved when wet or dry; leaf margins crenate-dentate distally, hyaline (decolorate); lamellae incised, coarsely and irregularly dentate in profile; capsule ovoid-gibbous, strongly curved, horizontal.||Psilopilum laevigatum|