Grimmia sessitanaDe Not. (redirected from: Grimmia tenerrima De Not.)
Family: Grimmiaceae
grimmia dry rock moss
[Grimmia alpestris f. sessitana (De Not.) Loeske, moreGrimmia alpestris var. sessitana (De Not.) I. Hagen, Grimmia subpapillinervis Kindb., Grimmia tenerrima De Not., Orthogrimmia sessitana (De Not.) Ochyra & Żarnowiec]
Plants: in dense patches, dark green, brown-green, sometimes almost black. Stems: 0.5–1 cm, central strand strong. Leaves: lanceolate to ovate-lanceolate, 1–1.8 × 0.2–0.6 mm, keeled, not plicate, one margin commonly recurved, sometimes both plane, awn 0.3–0.8 mm, costal transverse section prominent, semicircular; basal juxtacostal laminal cells rectangular to elongate, straight, thin-walled; basal marginal laminal cells short- to long-rectangular, straight, thick transverse and thin lateral walls, hyaline or not; medial laminal cells quadrate, sinuose, thick-walled; distal laminal cells 1-stratose, often bulging, marginal cells widely 2-stratose, often bulging. Sexual: condition cladautoicous, perichaetial leaves not enlarged. Seta: straight, 1–2.5 mm. Capsule: usually present, exserted, yellow, ovoid to elliptic, exothecial cells short-rectangular, thin-walled, stomata present, annulus of 1 row of quadrate, thick-walled cells, operculum conic, usually with a short obtuse beak, peristome present, fully-developed, split or solid in distal half.
Exposed or sheltered, moist, acidic granite and sandstone, alpine. moderate to high elevations (1100-3900 m). Greenland, Alta., B.C., Nfld. and Labr., N.W.T., Que., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.H., N.Mex., N.Y., Oreg., Utah, Wash., Wyo., South America (Argentina, Chile), Eurasia, Africa (Kenya, South Africa, Uganda), Antarctic.