Thallus chalky white or grey-white, thick, wrinkled to irregularly areolate-cracked, margins effuse, indeterminate, matt, minutely papillate. Fertile verrucae rounded to subirregular 0.6-1.4 mm diam., hemispherical to ± conical, apex often flattened, concolorous with thallus. Apothecia immersed, 1-2 per verruca, ostioles carbonaceous, black, shining, surrounded by a narrow zone of pellucid tissue, internal tissues black. Asci 2-spored, endoascus well-developed, with a prominent apical dimple. Ascospores uniseriate, broadly ellipsoid with rounded ends, contents granular at first then hyaline 120-165.3 × 39.15-60 µm, wall 8.7-17.4 µm thick. Chemistry: TLC nil.