Description: Thallus crustose, episubstratic, whitish grey, greenish grey or pale ochre, continuous, rimose or areolate, forming patches to 5 cm in diam. Areoles 0.15-0.55 mm across, irregular in outline, the margins often crenulate or slightly raised. Apothecia biatorine, sessile and constricted at base, orange-brown to red-brown, 0.2-0.7(-1.5) mm across, with an initially flat, then strongly convex and sometimes tuberculate disc, and a paler, thin, smooth, soon excluded proper margin. Proper exciple 25-80(-100) µm wide laterally, colourless in outer part, pale brown within, of radiating hyphae with angular-elongate (brick-shaped), 1-2.5 µm wide lumina; epithecium scarcely differentiated from the hymenium, colourless to very pale brown; hymenium colourless, yellowish or brownish, 35-60 µm high; paraphyses conglutinate, simple or poorly branched, 1-1.5 µm thick at mid-level, the apical cells to 4 µm wide; hypothecium yellowish or brownish, 35-200(-300) µm high. Asci 8-spored, clavate, thick-walled, the outer wall weakly I+ reddish, Biatora-type. Ascospores 1-celled (rarely 1-septate), hyaline, ellipsoid, (8-)10-15(-21) x 3-5(-6) µm, with a thin perispore. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: one of the commonest Biatora-species in the Alps, especially on plant remains and on basal parts of subalpine shrubs, overlooked, and certainly more widespread in the Alps, and also known from the northern Apennines. See also notes on B. cuprea and B. vernalis.