Thallus creamy, whitish or pale greenish, thin or thick, scattered or ± continuous, verrucose-rimose to ± areolate to ± furfuraceous, uneven-verrucose, shining or matt, in irregular patches 1-3(-8) cm diam., with or without a thin, black, wavy prothallus at margins, corticolous. Apothecia sessile, constricted at base, solitary or 1-3-confluent, plane to convex, 0.1-1.0 mm diam., disc brownish-black to reddish-brown, with or without a distinct blue-white pruina, margins prominent, swollen, entire to subcrenulate, persistent, blackened concolorous with disc in exposed forms, or more often reddish-brown, translucent. Epithecium black or olive-brown, 10-13 µm thick. Hymenium colourless 60-75 µm tall. Hypothecium olive-greenish or brownish, 40-50 µm thick. Asci I+ blue. Ascospores biseriate oval or broadly ellipsoid with pointed or rounded ends (13.5-)15-19(-22) × 6-7(-9) µm, straight or slightly curved and ± fabiform.