Plants: small. Stems: short, branches many. Leaves: not falcate-secund, 0.8–1(–1.1) mm; apex abruptly acute to short-acuminate; medial laminal cells usually isodiametric, corners angular, prorulae distinct. Phenology: Capsules rare, mature Jun–Aug.
Dry calcareous to siliceous boulders and outcrops, exposed mineral soil. moderate to high elevations (1400-2400 m). Alta., B.C., Calif., Mont., Utah, w Eurasia. Discussion.