Thallus brown, olive brown or dark brown, continuous or slightly cracked, thin, mostly endophloeodal, sometimes in extensive patches. Anamorph: Conidiomata pycnidia. Those containing macoconidia 50-120 µm diam., hemisphaerical, with an involucrellum. Conidiogenous cells 5-11.5 × 2-2.5 μm, flask-shaped, proliferating percurrently, without clear periclinal thickening or collarette. Macroconidia (12.5-) 13.5-17.5 (-20) × (2-) 2.5-3 (-3.5) μm, cylindrical to cylindric-ellipsoidal, (0-)1-septate, hyaline, at each end with a poorly visible filamentous appendage 1.5-4.5 × 1-2 μm in size; each cell containing (2-) 3-4 (-5) persistent oil droplets. Conidiomata containing microconidia like those containing macroconidia but slightly smaller (50-100 µm diam.), the microconidia 2.5-4 × 1-1.5 μm, fusiform or subfusiform. Ascomata perithecia, 200-300 µm diam., projecting, immersed only in the lower quarter, ± conical. Interaqscal tissue of copious pseudoparaphyses, mostly simple, only rarely branched and anastomosing, except where adjacent to the peridium. Asci cylindrical to narrowly clavate, fairly thick-walled and fissitunicate, the base shortly stalked with a more or less bilobed foot, apex thickened into a poorly defined tholus, with an ocular chamber, not staining in iodine, 8-spored. Ascospores arranged biseriately, (16-) 19-24 (-27) × (3.5-) 4-5 μm, 1-septate, separating into part-spores at ascus dehiscence or before, the part-spores (8.5-) 9.5-12.5 (-14.5) × (3-) 3.5-5 (-5.5) μm in size.