Holotype: MFLU 11-1115
Etymology: Referring to the clavate ascospores
Saprobic on submerged wood in fresh water in Thailand. Sexual morph: Ascomata 400–500 μm high, 350–400 μm diameter ( = 470 μm high × 390 μm diameter, n = 10), subglobose, immersed to erumpent, black, papillate, with a slot-like ostiole; papilla 150–170 μm long, 170–230 μm wide, black, papillate, with hyaline periphyses; periphyses 35–45 μm long, 2.5–3 μm wide, branched at the base, numerous. Peridium unequal in thickness, 20–60 μm thick at upper part, broader (up to 100 μm) near the base, composed of parallel rows of rectangular to polygonal brown cells of 5–8 × 2.5–5 μm. Pseudoparaphyses 1.8–2.5 μm thick ( = 2.2 μm, n = 10), hypha-like, hyaline, septate, filamentous, numerous, anastomosing above the asci. Asci 140–160 × 20–30 μm ( = 151 ×25 μm, n = 10), 8-spored, fissitunicate, cylindrical to clavate, with a relatively long pedicel (22–30 μm), apically round with a broad ocular chamber. Ascospores 33–45 × 11–12.5 μm ( = 38.3 × 12 μm, n = 20), L/W 2.7–3.6 (mostly 3.2), mostly 2-seriate, narrowly ellipsoidal with acute ends, 1-septate, constricted at the septum, septum mostly median, upper cell slightly broader than lower cell, hyaline, with one large guttulate in each cell, smooth, thin-walled, with a mucilaginous collar around its equator, surrounded by a spreading papilionaceous sheath, 20–28 μm thick. Germ tube mainly formed from both end cells Asexual morph: Undetermined. (Descriptions from Zhang et al. 2014)
Material examined: CHINA, Tibet Autonomous Region (30°15'08.02" N, 82°58'27.77" E), on submerged decaying wood, May 2017, Z.L. Luo, 2XZ A 1–2–1, S-1483 (MFLU 19–0994, holotype), ex-type culture, MFLUCC 18–1316.