Thallus foliose-lobate, rosette-forming to spreading, ± closely attached, 5-10(-16) cm diam., without a prothallus. Lobes irregularly imbricate and wrinkled-plicate, apices incised or notched, much folded, margins thickened, tomentose, entire. Upper surface bright lettuce-green when wet, pale greenish-yellow to buff on storage, with a slight, white, marginal pubescence, smooth, matt, ± waxy, very slightly uneven at apices. Cephalodia mainly on lower surface, simple, globose becoming glomerulate, occasionally marginal and spreading to upper surface, placodioid-wrinkled-plicate, to 2 mm diam., blue-grey. Lower surface conspicuously striate with lower medullary hyphae arranged parallel to length of lobes, pale whitish at margins, becoming brown centrally. Apothecia sessile to subpedicellate, often numerous, to 2 mm diam., disc plane or subconcave, smooth, matt, brown or red-brown, epruinose, very rarely with a central thalline lobule, rarely gyrose-etched or fissured, margins thick, crenate- striate, obscuring disc in young fruits, thalline exciple very gnarled. Ascospores subglobose, 14-16 × 12-14 µm, epispore 2.5 µm thick verrucose, sometimes apiculate.