Anamorph: Conidiomata observed only in culture. Conidiophores formed from the entire inner surface of the conidioma,12–30 × 2–4 µm, septate, branched, hyaline. Conidiogenous cells cylindrical, the lower part often slightly swollen, proliferating percurrently with minute collarettes. Conidia 4–6 × 1.5–2 µm, cylindrical to cylindric-ellipsoidal, aseptate, hyaline, smooth-walled, without a gelatinous sheath or appendages [data from Tanaka & Harada, 2003].
Teleomorph: Ascostromata scattered or aggregated, often in linear groups, 300–450 µm tall, 500–800 µm diam, semi-erumpent, globose-conical but often elongate, the apical part papillate with a well-developed matt black irregular crest to 250 µm tall and to 500 µm in length. Ascostromatal wall 35–50 µm thick laterally, rather thinner at the base, strongly melanized, composed of 5–8 layers of flattened angular cells. Interascal tissue composed of copious thin-walled anastomosing pseudoparaphyses 1.5–2.5 µm diam, lacking a gelatinous matrix. Asci 115–140 (–170) × 13.5–15.5 (–17) µm, narrowly clavate, with a short tapered stalk, fissitunicate, with a small ocular chamber, 8-spored. Ascospores arranged biseriately, (29.5–)33–38 [mean 35.0, sd 2.03, n=40] × 5–7.5µm [mean 6.3, sd 0.64, n=40], mean length/breadth ratio 6.54:1, fusiform, slightly constricted at the septa and slightly more so at the ± median primary septum, the cell immediately above the primary septum usually a little inflated, guttulate when young, becoming mid brown with the end cells sometimes slightly less strongly pigmented, smooth-walled or faintly verrucose, without a gelatinous sheath or appendages.