Thallus determinate, effigurate, orbicular to irregularly spreading, to 6 cm diam., saxicolous. Marginal lobes swollen, expanded at apices, rounded, crenate, discrete or becoming confluent, usually separated bynarrow cracks, extending into centre of thallus, lobes also transversely cracked, wrinkled or folded. Upper surface distinctly rust-red to orange-brown, epruinose, areolate centrally, areolae swollen, rounded to irregular, 0.5-2 mm diam., isidia absent, sorediate. Soredia sparse to numerous, grey-white, erumpent, subrotund, to 2 mm diam., forming abraded patches on areolae. Cephalodia sparse, rounded to irregular, or radially lobate, 2-5 mm diam., brownish-red, dull, epruinose. Apothecia not seen. Pycnidia immersed in areolae, ostiole minute, punctiform. Conidia filiform, straight or curved 13-16 × 0.5 µm. Chemistry: Cortex K-, C+ red; medulla K-, C+ red, KC+ red, Pd+ red.