Thallus pale greyish-green or whitish-olivaceous or pale olivaceous, ± continuous, occasionally irregularly cracked, slightly irregularly wrinkled or verrucose, shining, delimited at margins by a wavy, black prothallus, in irregular patches 1-2 cm diam., corticolous. Apothecia scattered, solitary, 0.2-0.8(-1.0) mm diam., plane to subconvex, black, matt or shining, epruinose, margins concolorous with disc, slightly raised to ± occluded. Epithecium 10-15 µm tall, pale olive-greyish. Hymenium 40-45 µm tall, colourless. Hypothecium 45-60 µm thick, pale yellowish. Paraphyses free, simple, non-septate, 2 µm thick, apices slightly swollen to 3.5-4 µm. Ascospores oval-ellipsoid, to ± fabiform, straight or curved, apices pointed or rounded, locules equal often with one conspicuous nucleus, 15.3-20.4 × 5.1-6.8 µm.