Thallus ± appressed, moderately to loosely adnate, 2-7 cm diam., saxicolous. Lobes 0.5-3 mm broad., ± flat, short and rounded, contiguous to imbricate. Upper surface red-brown to dark olive-brown, paler and yellowish at apices, smooth at apices, becoming strongly wrinkled centrally, dull throughout, or slightly shining or pruinose at apices, sparsely to densely isidiate. Isidia pustular, 0.05-0.3 mm diam., sometimes clustered. Lower surface dark brown to black, paler at apices ± smooth, dull, moderately rhizinate. Rhizines concolorous with lower surface, to 0.6 mm long. Apothecia and pycnidia not seen. Chemistry: Cortex K-, HNO3+ dark blue-green; medulla K+ yellow-red, C-, Pd+ pale orange. Four unidentified compounds similar to stictic and norstictic acids.