Thallus appressed to somewhat pulvinate, moderately to loosely adnate, 2-7 cm diam., saxicolous. Lobes 0.4-3 mm broad., flat, short and rounded to elongate, contiguous to imbricate. Upper surface yellowish to reddish-brown or dark brown, paler and yellower at apices, smooth to strongly pitted at apices, smooth to weakly wrinkled centrally, dull throughout or shining at apices which are sometimes also pruinose, sparsely to densely isidiate. Isidia cylindrical, simple or branched, 0.2-1 mm tall. Lower surface black, ± smooth, dull, moderately to sparsely rhizinate. Rhizines concolorous with lower surface, to 0.4 mm long. Apothecia infrequent, sessile, ± concave, to 5.5 mm diam., margins soon isidiate. Ascospores ellipsoid, 8-12.5 × 4.5-6 µm. Pycnidia rare. Conidia bifusiform, 5.6 × 1 µm. Chemistry: Cortex K-, HNO3+ dark blue-green; medulla K-, C-, KC+ rose red, Pd-. Alectoronic and α-collatolic acids. UV+ blue-white.