Teleomorph: Stromata composed of subcortical brown thick-walled hyphae, often degenerating by maturity of the ascostromata. Ascomata 300-500 µm diam, globose to turbinate, the base slightly constricted, the apical portion somewhat flattened with a minutely papillate ostiole, matt black, minutely verrucose, often coalescing, erumpent in ± linear clusters through the bark. Peridium composed of an outer layer of strongly melanized textura angularis, with an inner layer of similarly shaped paler cells, the locule surrounded by thick-walled hyaline flattened cells. Interascal tissue composed of copious cellular pseudoparaphyses to 3 µm diam, frequently septate. Asci 134-180 x 13-15 µm, cylindrical, usually short-stalked, thick-walled and fissitunicate, the apex rounded to truncate with a distinct apical invagination in the inner wall, 8-spored. Ascospores 21-26(-28) x 9-11 µm, cylindric-ellipsoidal, the ends usually obtuse, constricted at the ± median primary septum, the halves ± similar in shape, golden brown, without a mucus sheath, with 4-6 secondary transverse and 1-2 longitudinal septa, variable in orientation.
The type material (and apparently the only GB collection) appears no longer to contain the fungus; the description is taken from an Italian specimen. If this is correctly identified, the species may be a synonym of Teichospora obducens; there appear to be few substantial differences between the two taxa. It should also be compared with Karstenula rhodostoma, also recorded on Frangula.
Erumpent through the bark of dead twigs of Euonymus europaeus
England: Surrey. Also known from central and southern Europe.