Thallus crustose, uniform, thin or thick, continuous or ± areolate-cracked, smooth, or granular-roughened, matt to somewhat pulverulent, in irregular, spreading patches, delimited by a thin, black prothallus, often forming confluent mosaics on bark. Photobiont green, , cells minute, oblong-ellipsoid, in filaments. Apothecia innate, compound, in well-developed stromata in raised thalline verrucae, verrucae concolorous with thallus or paler, round to irregular, polycarpic, discs flat or subconcave, black or red-brown, matt, epruinose. Hypothecium brown or blackish-brown. Asci bitunicate, cylindrical-clavate, 8-spored. Paraphyses numerous, branched or netted. Ascospores fusiform-acicular, flexuose, 3-5-septate, normally 3-septate, colourless.