Thallus orbicular to spreading, 5-15 cm diam., corticolous or muscicolous. Lobes rounded, flattened, closely attached centrally, subascendent apically, margins entire, rounded, sinuous. Upper surface markedly faveolate-reticulate, faveolae 2-3 mm wide, separated by well-defined ridges, olive-brown to reddish-brown to greyish-red or grey (shade forms), matt or shining in parts, sometimes white-maculate (×10 lens). Lower surface distinctly bullate, shining, creamish-buff at margins, dark grey-brown centrally, glabrous. Apothecia pale to dark brown, 5-10 mm broad and 2-5 mm long with a narrow, entire margin. Ascospores biseriate, pale brownish, 2-septate, 14-20 × 7-8 µm. Chemistry: Zeorin, unidentified terpene, perlatolic acid and unidentified pigment (±).