Thallus ± orbicular to 8 cm diam. Lobes 0.2-0.6(-1.0) cm wide, adjacent to imbricate, broadly cuneate to flabellate, apices rotund. Upper surface rather variable in texture, smooth, matt or slightly shining to ± wrinkled, scabrid, isidiate, often also with transverse, concentric ridges. Isidia concolorous with thallus or darker, terete, nodular when young, becoming coralloid, sparse or forming a dense, ± areolate crust centrally. Rhizines dense, colour variable, pale to dark bluish-black (then often white-tipped), sometimes projecting beyond lobe margins. Apothecia adnate, to 0.4 cm diam., orbicular at first, becoming irregular with age, disc pale brown-red to black. Ascospores 9-11 × 3-5 µm.