Thallus crustose, heteromerous, well-developed on substratum to effuse, ecorticate. Photobiont green, or . Perithecia compound, comprising an involucrellum and exciple, sessile to immersed,glabrous, sometimes subtomentose, rarely ± verrucose. Paraphyses persistent, discrete, simple or rarely branched, c. 1-2 µm thick. Asci unitunicate, clavate-fusiform, ± ellipsoid, obclavate or cylindrical, thin-walled (wall 1-2 µm thick), 8-spored. Ascospores colourless, elongate-fusiform, with one to several transverse septa, septa thin, locules ± cylindrical. Pycnidia sessile to immersed. Macroconidia simple, or transversely septate, filiform, cylindrical or bacillar. Microconidia simple, usually ellipsoid or fusiform.