Thallus closely attached, irregularly spreading 5-10(-15) cm diam. Lobes very variable, broadly elongate (1 × 5 cm) ± contiguous or discrete to short, rounded, 2-8 mm diam., and ± imbricate, margins slightly thickened, sinuous, notched or incised, to ± densely denticulate-phyllidiate. Phyllidia marginal, lobulate, simple to coralloid, delicately white-pubescent. Upper surface undulate, dark slate-grey-blue when wet, pale greyish-fawn when dry, smooth, shining or matt, coriaceous, not reticulate-faveolate or areolate-scabrid, without maculae, soredia, isidia or pseudocyphellae. Medulla white. Photobiont blue-green. Lower surface whitish to pale buff and ± glabrous at margins, darkening to ± blackened centrally, tomentose centrally. Tomentum thick, white or buff. Pseudocyphellae white, prominent, fleck-like at margins, ± convex centrally, 0.05-0.2 mm diam., scattered, rather sparse to moderately common. Apothecia sessile to subpedicellate, rare, laminal or submarginal, sparse to moderately abundant in some collections, concave to plane, disc red-brown to dark brown, shining, epruinose, 0.2-1.5 mm diam., margins pale flesh-coloured, entire to subcrenate, verrucose-scabrid, persistent, often obscuring disc in young fruits. Ascospores uniseriate or biseriate, colourless to pale yellowish-brown, 1-3-septate, ellipsoid, with pointed ends, 20.4-27.2 × 6.8-8.3 µm. Chemistry: 7β-acetoxyhopan-22-ol, hopane-15α,22-diol, hopane-7β,22-diol (tr.).