Anamorph: not known. Teleomorph: stromata consisting of a thin black basal layer from which irregular but strongly aggregated clusters of 2-8 ascomata develop within a poorly developed pale brown entostroma composed of a mixture of fungal and degraded host cells; initially developing below the bark but becoming superficial when the cortical layer sloughs off. Ascomata 250-350 µm diam. and 300-350 µm tall, globose to subglobose with a short ± cylindrical neck to ca 100 µm tall, not collapsing when dry, black, the surface smooth. Peridium 20–30 mm thick, composed of an outer layer of dark brown thick-walled angular cells and an inner layer of small, compressed paler brown cells, with a hyphal coat encusted with dark red crystalline deposits that degenerates in older collections. Interascal tissue composed of broad very thin-walled branched paraphyses 4-5 µm diam., tapering towards the apex. Asci 48-60 x 4-5.5 µm, cylindrical to cylindric-clavate with a long tapering stalk (to ca 25 µm in length), thin-walled, not fissitunicate, the apex obtuse to truncate with an inconspicuous, minute apical ring, 8-spored. Ascospores arranged uniseriately (they may appear partially biseriate in heavily squashed mounts), 3.5-4 x 3-3.5 µm, globose to broadly ellipsoidal, hyaline, rather thick-walled, aseptate, smooth, without a gelatinous sheath or appendages.