Thallus crustose, pale to dark grey, often tinged glaucous or blue, usually rather thick, more rarely thin, occasionally immersed and inconspicuous, continuous, somewhat waxy, the surface smooth or rarely warted, the margin not placodioid, prothallus pale or absent. Isidia and soredia absent. Photobiont trebouxioid. Anamorph: not recorded. Teleomorph: ascomata apothecia to 1.5(-2) mm diam., scattered to ± contiguous, sometimes overlapping, often angular due to compression, sessile, constricted at the base. Thalline margin ± persistent, grey, even, swollen, raised, often flexuous. Disc orange, orange-yellow or green, concave when young, becoming flat when mature. Epithecium with copious orange crystalline deposits. Hymenium and hypothecium hyaline. Interascal tissue of broad thick-walled usually unbranched paraphyses, swollen towards the tips, to ca 4 μm diam. Asci clavate, almost sessile, thick-walled, the apex often attenuated, 8-spored. Ascospores arranged biseriately, 11.5-13.5 (-15) × 5.5-7 μm, ellipsoidal to cylindric-ellipsoidal, hyaline, disoseptate, the septum 5-7 μm broad at the outer wall and ca 2.5 µm at the central canal, 35-50% of the length of the ascospore, without an epispore, gelatinous sheath or appendages. Chemistry: thallus and thalline margin K–, discs K+ purple.