Anamorph: conidiomata pycnidia, 80–170 µm diam., black. Peridium 10–40 µm thick, composed of 3–6 layers of irregularly flattened cells. Conidiogenous cells lining the conidiomatal cavity, 6.5–12 x 4–7.5 µm, ellipsoidal to ampulliform, without annellations. Conidia (6.5–) 9–11.5 (–16.5) x (4.5–) 6.5–8.5 (–10) µm, broadly obovoid to subglobose, usually truncate at the base, aseptate, smooth-walled, hyaline or golden brown (pigmentation most intensive in walls), guttulate. Teleomorph: stromata absent. Ascomata perithecia, (60–)100–220 (–280) µm diam., usually in large clusters and often tightly packed and confluent, subglobose to broadly ellipsoidal, erumpent to ± superficial and then almost sessile, dark brown to black, glossy, tuberculate and often rugose. Ostiole 10–50 µm diam., sometimes forming as an irregular split. Peridium orange-brown or reddish-brown, 20–70 µm thick in exposed parts, 10–35 µm in immersed parts, composed of 4–9 layers of irregularly flattened angular cells 3-12 µm diam., the outer layers pale to dark brown and very thick-walled and the inner layers hyaline. Interascal tissue of persistent septate scarcely branched and anastomosed pseudoparaphyses 1.5–3.5 µm diam., not swollen at the apices, interascal gel I-, K/I-. Asci (66–) 75–90 (–100) x (10–) 12–14 (–15) µm, ± cylindrical to cylindric-clavate, short-stalked, fissitunicate, tholus 0.5–3 mm tall, apical beak often distinct, short, sometimes refractive, cytoplasm becoming intensively yellowish brown to brownish orange with I and K/I, (6–) 8-spored. Ascospores uniseriate or partially biseriate, (11–) 14.5–19 (–24.5) x (4.5–) 5.5–7 (–9) µm, ellipsoidal to narrowly ellipsoidal, the ends rounded, (0–) 1-septate, the upper cell often larger, often constricted at the septum, at first hyaline but finally becoming pale yellowish brown, smooth (sometimes slightly roughened when overmature), without a gelatinous sheath or appendages.