Plants reddish brown to black. Leaves erect-spreading to squarrose, straight, panduriform, widest distally, apex symmetric; costa absent; leaf margins denticulate along leaf base; basal laminal cells rectangular to long-rectangular, marginal cells similar, walls pitted, nodose; medial laminal cells rounded-quadrate to ovate, 1-stratose entirely or sometimes 2-stratose distally, lumens rounded; laminal papillae rare, low. Sexual condition cladautoicous; perichaetial leaves differentiated, convolute-sheathing. Spores 18-28 µm.
Wet acidic or basic rock; Greenland; s, w South America; n Europe.
The spores of Andreaea alpina are of two types, the brown spores generally smaller than the green, and apparently abortive. This comparatively robust species is easily identified by the panduriform leaves with basal marginal denticulations.
Plants: red-brown to purple-black. Leaves: straight to secund, panduriform, widest in distal half, apex usually symmetric; costa absent; leaf margins entire; basal laminal cells rectangular to long-rectangular, marginal cells rectangular, walls thick, pitted-nodose; medial laminal cells quadrate, 1-stratose, lumens irregularly stellate to rhombic; laminal papillae low or absent. Sexual: condition autoicous; perichaetial leaves differentiated, convolute-sheathing. Spores: 20–35 µm.
Rock or soil in streams. low to moderate elevations. Greenland, B.C., Nfld. and Labr. (Labr.), Nunavut, Yukon, Alaska, n Eurasia, c Africa.
Like Andreaea alpina, A. obovata has spores in two size classes, the smaller apparently abortive. It is very rare in the flora area and can be distinguished from A. rupestris by the panduriform leaves.