Thallus ± orbicular to spreading, 8-15(-20) cm diam., ± closely attached. Lobes broad (2-4 cm) at centre, narrow (0.5-1.5 cm) at margins, dichotomously to complexly branched, margins entire, ± thickened, notched, incised or ± minutely lobulate, often with conspicuous, white, punctiform to irregular pseudocyphellae, sometimes ragged uneven and ± subascendent. Upper surface lettuce-green when wet, olive-brown at margins or sometimes ± generally blackened, smooth or very shallowly faveolate-uneven, glossy at margins, smooth, matt centrally. Medulla white. Photobiont green. Lower surface sometimes with a narrow, glabrous, wrinkled marginal zone at lobe apices, ± densely and regularly thick, pale tomentose, whitish buff at margins, darkening to almost black centrally, tomentum thick, felted, pale, white, silky. Pseudocyphellae white, scattered, verruciform, frequent at margins, sparse centrally, 0.1-1.0 mm wide, round to irregular, flat, with a slightly raised margin. Apothecia mainly marginal, occasionally laminal, subpedicellate, disc red-brown, densely white-pruinose, margins pale or whitish, crenate to ± lobulate-roughened, completely covering disc when young, thalline exciple white, granular-verrucose. Ascospores brown-black, ellipsoid-fusiform, polaribilocular, 25-30 × 8-9 µm. Chemistry: Methyl virensate, physciosporin, hopane-6α, 7β,22-triol, two dull grey-green pigments, stictic, norstictic and constictic acids.