Bambusicola mangensis L. S. Han & D. Q. Dai 2026, sp. nov.

Bambusicola mangensis L. S. Han & D. Q. Dai sp. nov. Fig. 2 Etymology. Named after the locality where the holotype was collected, Mang City (China). Holotype. GMB-W 1160. Description. Saprobic on dead culms of bamboo. Sexual morph: Ascomata 350–450 μm diam., 170–210 μm high, raised, immersed, solitary to gregarious, sometimes forming stroma with a clustered 1–3 ascomata, coriaceous, dark brown, dome-shaped to subglobose, visible as a central black spot papilla, uni-loculate, with a central ostiolate. Peridium 10–35 μm, thick-walled, composed of several layers brown to pale brown cells of textura angularis. Hamathecium composed of 1–2 μm, dense, hyaline, filamentous, trabeculate, septate, anastomosing pseudoparaphyses above the asci. Asci 80–110 × 9.5–13 μm (x ̄ = 90 × 11.5 μm, n = 20), 8 - spored, bitunicate, fissitunicate, hyaline, cylindric-clavate to clavate, straight to slightly curved, short pedicellate, truncate or furcate pedicel, apically rounded, with an ocular chamber. Ascospores 22–30 × 4.5–6.5 μm (x ̄ = 25.5 × 5.5 μm, n = 20), overlapping 2–3 - seriate, hyaline, fusiform, constricted at the septum, occasionally with guttules, smooth-walled, mostly 1 - septate, occasionally with 2 - septate, surrounded by a mucilaginous sheath. Asexual morph: Undetermined. Culture characteristics. Ascospores germinate on PDA, with colonies reaching 25 mm diam. after 25 days in the dark at 25 ° C. Colonies are raised with regular margins; colonies are three-layered, with colors ranging from white to brown to blackish brown from the center to the margin and brown to dark brown on the reverse, without producing pigment on PDA medium. Material examined. China • Yunnan Province, Dehong Dai and Jingpo Autonomous Prefecture, Mang City, Xuangang Village, on dead culms of unidentified Bambusoideae (Poaceae), 22 July 2023, L. S. Han & D. Q. Dai, HLS 33 (GMB-W 1160, holotype), GMBCC 1160, ex-type; • ibid. (MHZU 24-0628, isotype), ZHKUCC 24-1164, ex-isotype; • ibid. HLS 33-1 (GMB-W 1154), living culture GMBCC 1154. Notes. Phylogenetically, the new isolates (GMBCC 1154 and GMBCC 1160) formed a sister clade to Bambusicola didymospora (MFLUCC 10-0557, ex-type) with high statistical support (100 % ML, 1.00 BYPP) (Fig. 1). Morphologically, the new collections have longer asci (80–110 μm vs. 55–85 μm) and ascospores (22–30 μm vs. 17–23 μm) than those of B. didymospora (Dai et al. 2017). Furthermore, the ostioles of B. didymospora have red pigment (Dai et al. 2017), whereas no red ostiolar pigment was observed in the new species. Therefore, Bambusicola mangensis is introduced as a new species based on phylogeny coupled with morphological differences.