Ascomata solitary to grouped, immersed in bark. Stromatic tissues delimited by a black marginal line (conceptacle) or not. Ectostromatic disc usually surrounded by tightly ostiolar necks. Perithecial ascostroma inclined to upright, flask-shaped to spherical, arranged circularly or irregularly. Paraphyses present or deliquescent. Asci free floating, ellipsoid to clavate, apical ring chitinoid, refractive. Ascospores hyaline, elongate-allantoid, aseptate, thin-walled, biseriate to irregularly multiseriate, 4, 8 or more per ascus. Conidiomata stromatic or pycnidial, immersed in bark. Stromatic tissues delimited by a black marginal line (conceptacle) or not. Ectostromatic disc prominent or lacking, one to more ostioles per disc. Locules single, undivided to multiple chambered with invaginations. Conidiophores borne along the locules, branched or unbranched. Conidiogenous cells enteroblastic, phialidic. Conidia hyaline, allantoid, aseptate, small and narrow.