Andreaea alpina Hedwig 1801

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 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.

Andreaea alpina

Andreaea alpina Hedw., Sp. Musc. 49, 1801. [Original material: Wales, coll. Dillen.]

Andreaea naumannii C. Müll., Bot. Jahrb. 5:76, 1883. [Original material: Kerguelen, coll. Naumann.]

Andreaea squamata C. Müll., Bot. Jahrb. 5:77, 1883. [Original material: Kerguelen, coll. Naumann.]

Plants blackish, about 1 cm high. Stems sparsely branching. Leaves 0.8 mm long, 0.4–0.5 mm wide, strongly panduriform with lower half sheathing, upper half slightly spreading with incurved tips, apices distinctly and rather abruptly long-attenuate; lower margin with distinct crenulations from projecting cell tips; ecostate; cells of lower lamina narrow and elongate with thick, reddish lateral walls, mostly 10 μm wide, up to 25 μm long, marginal cells sometimes paler; upper cells oval, mostly 10 μm wide and 15 μm long, alined longitudinally and obliquely. Perichaetium long-sheathing, inner leaves 2.0 mm long. Capsule with 4 valves split to the base.

MAS AFUERA: Correspondencia Camp, 3800 ft, H. & E. 52; trail to Los Innocentes, ca. 3000 ft, H. & E. 567.

The collections cited represent the first collections of the genus Andreaea from Juan Fernandez. The species is widely distributed in northern Europe, South Africa, southern South America, and the subantarctic islands.

Andreaea alpina là một loài rêu trong họ Andreaeaceae. Loài này được Hedw. mô tả khoa học đầu tiên năm 1801.