Thallus ± orbicular, in closely-attached often regular rosettes, or spreading, to 8 cm diam., saxicolous. Lobes rather short, to 1.5(-2.0) mm wide, irregularly dichotomously branched, not extended at apices, ± strongly contiguous at margins, ± congested-imbricate centrally, outer lobes smooth, glossy, centrally wrinkled-scrobiculate or corrugate, matt, margins rounded or shallowly incised, olive-green or brown or blackened, sometimes pale green-grey centrally, apices chestnut-brown, glossy, often grey-white-maculate, internal cavity black. Perforations rather large, infrequent, to 1 mm long, ± oval, in median line of lobes, plane with surface of lobes. Lower surface black, shining, glabrous, markedly scrobiculate, brownish at margins, eperforate. Apothecia often frequent, central, 0.5-2.5 mm diam., sessile, rounded, disc concave to ± plane, red-brown to dark brown, shining, epruinose, exciple smooth, shining, ± ridged, margins thick, entire, shining, concolorous with thallus. Epithecium granular, pigmented. Ascospores 2 per ascus, smooth, oval 44-52 × 17-20 µm, wall 3 µm thick. Chemistry: Stictic, constictic, norstictic and menegazziaic acids and accessory substances, medulla K+ yellow → orange, C-, KC+ orange, Pd+ orange.