Thallus crustose, heteromerous, orbicular, rosette-forming to spreading, lobate at margins in some species, closely attached, saxicolous or terricolous. Upper surface corticate, cortex paraplectenchymatous, matt or shining, areolate-cracked or with irregularly anastomosing cracks or continuous, or warted or wrinkled-plicate, usually whitish or cream or pinkish, orange-red in some species, pale green or olive-brownish or blackened in others. Soredia and isidia present or absent. Photobiont green, , cells spherical, 4-12 µm diam. Cephalodia always present, ± conspicuous, sessile or immersed, discoid or subglobose, irregularly lobed or folded and wrinkled, pinkish, reddish or red-brown or greyish, containing , or . Apothecia sessile or immersed, lecanorine, with a thalline margin concolorous with thallus, proper margin present, pale (sometimes undeveloped), disc variously coloured, ± plane, smooth or minutely scabrid, sometimes cracked, matt or shining or white-pruinose. Hymenium 80-320 µm tall, colourless or pale yellowish. Epithecium sordid yellowish with small, yellowish granules also present on tips of paraphyses. Paraphyses 1.5-2 µm thick, discrete, slightly swollen at apices. Hypothecium colourless, or pale yellowish, of intricately interwoven, unorientated hyphae. Asci cylindrical to cylindrical-clavate, 8-spored. Ascospores uniseriate or subbiseriate, colourless, simple, ellipsoid, elongate-ellipsoid or subfusiform. Pycnidia immersed, minute, punctiform.