Thallus foliose, lobate, 2-10 cm diam., orbicular to spreading, very closely attached. Lobes narrow, 2-4 mm wide, linear-elongate, subimbricate, margins incised, black, slightly thickened. Upper surface yellow, often blackened centrally, smooth, coriaceous, conspicuously wrinkled and cracked centrally, ± isidiate, maculae and soredia absent. Isidia slender, simple, becoming coralloid- branched, brownish, laminal, rarely at lobe margins. Lower surface black, shining, wrinkled-papillate. Rhizines black, simple. Apothecia not seen. Chemistry: Cortex K-; medulla K-, C-, KC+ pink, Pd-. Norlobaridone, loxodin and usnic acid.