Bryum argenteum var. muticum
Bryol. Univ. 1: 846. 1827.
Plants hoary white to silver-green. Stems shorter than 0.2 cm, gemmiform to short-julaceous. Leaves often broader than long, hyaline in distal 1/2–1/4; costal apiculus absent or very short, of 1 or 2 cells; distal laminal cells short-hexagonal, (1–)2–3:1, sometimes a few quadrate cells present.
Phenology: Capsules unknown.
Habitat: Dry soil, soil over rock, crevices, lowland deserts to dry alpine tundra
Elevation: low to high elevations (0-4000 m)
Ariz., Calif., Colo., Nev., N.Mex., Utah, South America, Australia, Antarctica.
Variety muticum is widespread in extreme environments, but the world distribution is not well known.