Thallus foliose-lobate, rather loosely attached centrally, margins ± free, to 15 mm wide. Lobes linear-elongate to ± rounded, 1 cm wide and 5 cm long, branching ± dichotomous, margins entire, slightly thickened, crenate at apices, sinuses between lobes rounded. Upper surface bright lettuce-green when wet, olivaceous-glaucous when dry, deeply and regularly reticulate-faveolate, connecting ridges prominent, lacunae deep, smooth, glabrous, without soredia, isidia, maculae or pseudocyphellae. Medulla white. Photobiont green. Lower surface pale yellowish-buff or ± whitish, conspicuously bullate, glabrous at margins, with short, soft, pale tomentum centrally. Pseudocyphellae white, punctate, small, scattered, rather indistinct. Apothecia sparse to occasional or frequent, scattered or contiguous, sessile or subpedicellate, marginal, disc 1-4 mm diam., black, smooth, matt, epruinose, margins thick, entire or subcrenulate, concolorous with thallus or distinctly yellowish or pale, thalline exciple smooth, shining, or slightly whitish or brownish, pubescent, concolorous with thallus. Ascospores biseriate, brown, polaribilocular (18.7-)22.1-25.5 × 6.8-8.3 µm, septum 1.5-2 µm thick. Chemistry: Cortex C+ red, methyl gyrophorate, tenuiorin, gyrophoric acid (±), methyl lecanorate (tr.), two unidentified depsidones, hopane-6α, 7β,22-triol, norstictic (tr.), stictic and constictic acids.