Thallus spreading, in irregular patches 2-6 cm diam., closely attached, 1-8 mm thick, rough, sordid yellow-brown or olivaceous, verrucose, verrucae convex, bullate, congested, 0.5-1 mm diam., not surrounded by prothallus, saxicolous. Apothecia ± scattered, deeply sessile, rounded, constricted at base, 0.2-1.5 mm diam., disc immersed, concave, black, matt, epruinose, thalline margin thick, concolorous with thallus, entire, crenulate, puckered to warted-globose, inflexed, surrounding disc as a thin, whitish, annular ring. Epithecium pale grey, granular, 18 µm thick. Hymenium brownish above, 180-220 µm tall. Hypothecium colourless, 30-40 µm thick. Paraphyses filiform, dense, straight interwoven, simple, eseptate, not swollen at apices. Asci oblong-clavate, apices rounded , 8-spored. Ascospores uni- or rarely biseriate, dark brown, broadly ovoid or broad ellipsoid, straight, muriform 24-35 × 14-16 µm. Chemistry: Thallus K-, C-, KC+ red.

Thallus pale to dark grey, sometimes with a yellowish tinge, roughened, warted-areolate, irregularly spreading or ± suborbicular 1-5 cm diam., saxicolous. Apothecia urceolate at first, emerging and opening out to reveal small, black, ± pruinose discs, proper margin visible within a thalline margin. Hypothecium black. Ascospores at first 5-septate becoming muriform, 22-40 × 10-18 µm. Chemistry: thallus K+ yellow, C+ red. Diploschistesic and lecanoric acids.