Diatrypella quercina

Asci fusiform to cylindric-clavate, up to 120 µm long, polysporous with up to 80 or more spores irregularly arranged inside, with a poorly defined inamyloid apical ring.

Paraphyses abundant, filiform, smooth, hyaline, multiseptate, very slender (up to only 2 µm wide) with minute internal oil guttules.

Ascospores strongly curved (allantoid), smooth, thin-walled, with pale brown intracellular pigment and occasionally with oil guttules.