Thallus crustose, smooth, verrucose, cracked or wrinkled, whitish, cream, greyish-white to olive greenish-grey, corticolous or saxicolous, rarely terricolous. Photobiont green, . Apothecia lecanorine, sessile or subpedicellate or ± immersed, 1-7 mm diam., thalline exciple prominent, concolorous with thallus, disc concave to convex, matt or pruinose, smooth or wrinkled or corrugate-cracked. Hymenium tall. Paraphyses branched, net-like. Asci clavate, I+ blue, with corona and amyloid tholus, 2-8-spored. Ascospores colourless, unicellular, large, usually longer than 30 µm, ellipsoid, thick walled.