Thallus appressed, moderately adnate, 4 cm diam., saxicolous. Lobes 1-2 mm broad, ± flat at apices, becoming convex centrally, linear-elongate and discrete. Upper surface reddish-brown to dark brown, ± smooth at apices, becoming weakly wrinkled and fissured centrally, ± dull, without isidia. Lower surface black, ± smooth, dull, sparsely to moderately rhizinate. Rhizines concolorous with lower surface, to 0.4 mm long. Apothecia common, sessile, flat to subconcave, becoming convex with age, to 1.8 mm diam., margins entire. Ascospores ellipsoid, 8.5-10.5 × 5.6 µm. Pycnidia common. Conidia 5.5-6.5 × 1 µm, bifusiform. Chemistry: Cortex K-, HNO3 ± dark blue-green; medulla K-, C-, KC+ rose, Pd-. Alectoronic acid (UV+ blue-white).