Thallus crustose, epiphloeodal or in part hypophloeodal, homoiomerous, ecorticate, not gelatinous when wet, corticolous or muscicolous. Photobiont green . Apothecia at first immersed, becoming emergent, adnate, globose or depressed-globose, thalline margin thin or thick, wrinkled, not much raised, lacerate, disappearing or closed over disc, or forming a narrow punctiform opening dehiscing from disc and becoming orbicular-dilated, margins of aperture fringed or crenulate or fissured, in radiating, recurved layers. Disc gyalectiform, ± immersed, concave, naked. Excipulum thin, paler or red- brownish, of felted, leptodermatous hyphae. Hymenium colourless, subhymenium thin. Paraphyses numerous, conglutinate, straight, simple, colourless, apices gradually thickened, septate (septa visible in I solution). Asci cylindrical-clavate to cylindrical, (1-)8-spored to many (20-40-80) spored. Ascospores ellipsoid or ovoid or fusiform-elongate, simple or transversely 1-10-septate, colourless, halonate. Pycnidia not seen.