Stromata 1-2 x 0.2-0.5 µm, oblong to linear, formed between vascular bundles of the host tissue, at first immersed beneath the apidermis but becoming widely erumpent through splits in the substratum, often aggregated and sometimes coalescing, matt black, 1- to 3-loculate, the ostioles inconspicuous, the outer part composed of several layers of mid brown thick-walled textura angularis with cells to 6 µm diam, the inner part of cells varying from textura angularis to porrecta, often vertically elongated and hyaline to pale brown, ranging from 6-10 x 2-5 µm in size. Anamorph: not known. Ascomata 150-250µm diam, globose to shortly pyriform, often slightly flattened at the base, thin-walled, the ostiole conspicuously periphysate. Peridium 15-25 µm wide, composed of compressed and sometimes vertically elongated textura angularis. Interascal tissue composed of thin-walled filamentous paraphyses to 5 µm diam. Asci 80-110 x 13-17 µm, cylindrical to cylindric-clavate, short-stalked, the walls thin at all stages of development, the apex obtuse to rounded without clear apical structures, 8-spored. Ascospores arranged biseriately, (19-) 21-25 x 6-7 (-8) µm, narrowly clavate-ellipsoidal, often slightly curved near the base, hyaline, smooth- and fairly thin-walled, with a single septum near the base of the spore, lacking gelatinous appendages or sheath.