Teleomorph: stromata not clearly defined, but perhaps present as an immersed hypostroma from which the ascomata are formed. Ascomata perithecia, occasionally solitary but usually aggregated into blackberry-like clusters, erumpent and finally ± superficial, sessile, subglobose, neck absent, the ostiole 30-40 µm diam., lined with periphyses which have dark rounded tips at the external surface. Ascomatal wall 50-70 µm thick, black and carbonaceous with tubercles and deep fissures, the outer layers composed of dark brown thick-walled angular cells with conspicuous Munk pores, the inner layers paler and thinner-walled. Interascal tissue not present, but downward-pointing periphysoids are formed from large thin-walled cells lining the inner wall in the apical region. Asci 90-100 x 12-14 µm, ± cylindrical, short-stalked, thin-walled, not fissitunicate, lacking an apical ring, not blueing in iodine, 4-spored. Ascospores 30-35 (-53) x 10-11 (-13) µm, broadly fusiform, at first hyaline but becoming dark brown, with (2-) 4-5 (-9) transverse (rarely oblique) septa with distinct central pores, the wall thin and smooth, eventually three-layered but without a perispore, or gelatinous sheath or appendages.