Thallus appressed to subpulvinate, moderately adnate, 2-8 cm diam., saxicolous. Lobes 0.5-2.5 mm broad, flat to moderately convex near apices, strongly convex centrally, elongate to linear-elongate, discrete to loosely entangled. Upper surface dark olive-brown to red brown or blackening, slightly paler at apices, smooth to weakly pitted at apices, wrinkled-plicate centrally, ± dull, without isidia. Lower surface dark brown to black, paler at apices, smooth and dull, flat to weakly channelled, sparsely to moderately rhizinate. Rhizines concolorous with lower surface, to 0.5 mm long, often in scattered clusters. Apothecia common, sessile, concave when young, plane or subconvex, to 3.5 mm diam., margins irregularly crenate. Ascospores broadly ellipsoid to subglobose, 7-9 × 5.5-6.5 µm. Pycnidia common. Conidia 5-7.5 × 1 µm, bifusiform. Chemistry: Cortex K- HNO3+ dark blue-green; medulla K-, C-, KC-, Pd-. Divaricatic acid.