Anamorph: named as Coniothyrium parasitans. Conidiomata pycnidia, similar to the ascomata but usually a little smaller. Conidiophores absent. Conidiogenous cells lining the conidioma wall, 8-14 x 5-7 µm, irregularly ampulliform to doliiform, proliferating percurrently, collarette minute, periclinal wall markedly thickened. Conidia 6-8 (-9) x 3-5 µm, ellipsoidal, aseptate, light to medium brown, smooth to finely verruculose, usually with two guttules [information derived from Jaklitsch et al. 2002]. Teleomorph: ascomata superficial on a basal hypostroma, 180-260 µm diam., often densely aggregated in large groups, globose to obpyriform, often laterally compressed by mutual pressure, black, carbonaceous, verrucose, with indistinct ostioles, hardly papillate. Peridium three-layered, 30-50 µm thick. Interascal tissue composed of numerous branched pseudoparaphyses to ca 3 µm diam., longer than the asci. Asci in a broad basal fascicle, 74-82 x 8-11 µm, cylindrical to cylindric-clavate, the base tapered and the apex rounded, thick-walled and fissitunicate, not blueing in iodine, 8-spored. Ascospores 12.5-15.5 x 4.6-5.2 µm, fusiform to fusiform-ellipsoidal, the apex obtuse and the base ± acute, strongly constricted at the median to marginally submedian septum, the upper cell often slightly broader, thick-walled, golden to mid brown, smooth, each cell usually biguttulate, with a narrow gelatinous sheath that may degenerate to appear slightly verrucose.