Thallus laciniate-lobate, spreading, ± loosely attached, 10-15(-25) cm diam. Lobes deeply incised, ± linear-elongate, margins very irregular, often lacerate- ragged and ± ascending, or flat, ± densely granular-sorediate. Upper surface glaucous green or fawn to olivaceous when wet, greyish-fawn when dry, thick, coriaceous, smooth to ± reticulate-faveolate, ridges low, ± sorediate. Soredia coarse, granular, whitish at first becoming superficially blackened. Medulla white. Photobiont green. Lower surface tomentose to margins, tomentum thick, regular, even, dark brown to blackish. Pseudocyphellae white, conspicuous. Apothecia marginal or submarginal, sessile or subpedicellate, disc 1-2 mm diam., smooth, dark brown or blackish, matt, margins concolorous with thallus, ± sorediate, thalline exciple smooth. Ascospores brown to blackish, polaribilocular, 27-30 × 9-12 µm. Chemistry: Hopane-6α,7β,22-triol, methyl virensate, physciosporin, norstictic, constictic and stictic acids (Wilkins and James loc. cit., Code B).