Stromata 1-2 x ca 0.5 mm, lenticular, formed between vascular bundles of the host tissue, at first immersed beneath the epidermis but becoming widely erumpent through splits in the substratum, often aggregated and sometimes coalescing, matt black, 3- to 5-loculate, the ostioles usually inconspicuous, the outer part composed of several layers of dark brown thick-walled textura angularis with cells 5-7 µm diam, often completely occluded by melanized material, the inner part of cells varying from textura angularis to porrecta, vertically elongated and hyaline to pale brown, 11-12 x 5-6 µm in size.
Anamorph: Cordella johnstonii. Conidiomata sporodochial, formed from a small basal stromatic cushion, setose, the setae 100-300(-450) µm in length, 4-6 µm diam at the base, erect, dark brown, unbranched, acute. Conidiophores to 140 µm in length, 3-4 µm diam, not synnematous, straight or flexuous, unbranched, ± hyaline to pale brown or olivaceous, faintly roughened, remotely septate, the septa thickened and highly refractive, formed from ampulliform mother cells 8-12 x 4-7 µm in size. Conidia formed terminally or from short side branches of the conidiophores which do not proliferate, the oldest at the top, 20-32 µm diam, 14-18 µm thick, lenticular, mid to dark brown, bilaterally flattened with a distinct hyaline band at the junction of the two sides.
Ascomata 170-340 µm diam, 125-225 µm high, globose to shortly pyriform with a flattened base, thin-walled, the ostiole periphysate. Peridium 10-15 µm wide, composed of compressed and sometimes vertically elongated textura angularis. Interascal tissue composed of thin-walled filamentous paraphyses 5-7 µm diam. Asci 65-85(-100) x 20-28 µm, broadly cylindrical to cylindric-saccate, short-stalked, the walls thin at all stages of development, the apex rounded with an inconspicuous J- apical ring, 8-spored. Ascospores arranged biseriately, (19-) 21-26 (-33) x (7-) 8-10 (-12) µm, ellipsoidal, ± straight, hyaline, smooth- and fairly thin-walled, with a single septum near the base of the spore, lacking gelatinous appendages or sheath.