Trichoderma nujiangense X. F. Liu, Karun., Tibpromma & K. D. Hyde 2026, sp. nov.

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Trichoderma nujiangense X. F. Liu, Karun., Tibpromma & K. D. Hyde sp. nov. Fig. 13 Etymology. Named after the type locality, Nujiang. Holotype. GMB -W 1546. Description. Associated with rock surface in the cave environment. Asexual morph on PDA: Vegetative hyphae 2–6 μm wide, septate, branched, hyaline, smooth-walled. Conidiophores pyramidal with verticillate, comprising a recognizable main axis, pairs or solitary branches, longer branches near the base, and short branches or solitary phialides arising near the tip. Phialides 5–11 × 2–5 µm (x ̄ = 7.94 × 3.32 μm, n = 50), ampulliform to lageniform, generally formed on terminal branches in divergent whorls of 2–3. Supporting cells 5–13 (– 18) × 2–4 µm (x ̄ = 9.11 × 2.92 μm, n = 50). Conidia 3–4 × 2–4 µm (x ̄ = 3.28 × 3.21 μm, n = 50), subglobose to globose, or ovoid, green, smooth-walled. Chlamydospores 5–8 (– 14) × 5–8 (– 9) µm (x ̄ = 7.13 × 6.76 μm, n = 20), single or in clusters, terminal and intercalary, variable in shape, mostly subglobose to globose, thick-walled, hyaline, granulate. Sexual morph: Undetermined. Culture characteristics. Colonies on PDA attaining 60 mm after 7 days at room temperature (25 ± 2 ° C), white, gray to green, sparse aerial mycelium on the surface, regularly circular, green conidiation occurs over time; reverse is green in the middle and white on the edges. Material examined. CHINA • Yunnan Province, Nujiang Lisu Autonomous Prefecture, Lushui City, Daxingdi Town, Walaya Cave, rock surface, 26.080743°N, 98.848391°E, elev. ca 850.46 m, 23 April 2024, Xiangfu Liu and Xuemei Chen, NJ 49 A (GMB -W 1546, holotype), ex-type GMBCC 2304, other living culture GZCC 25-0733. Notes. Phylogenetic analyses revealed that Trichoderma nujiangense (GMBCC 2304, ex-type) is closely related to T. cavernicola (GMBCC 1103 (ex-type) and GMBCC 1105) in Fig. 7. Morphologically, Trichoderma cavernicola differs from T. nujiangense by having more (2–4 (– 5) whorls vs. 2–3 whorls) and longer (6–17 × 2–4 µm vs. 5–11 × 2–5 µm) phialides on terminal branches, bigger supporting cells (4–22 × 2–8 µm vs. 5–13 (– 18) × 2–4 µm), and smaller conidia (4–7 × 2–5 µm vs. 3–4 × 2–4 µm) (Liu et al. 2025). The nucleotide comparisons between T. nujiangense (GMBCC 2304, ex-type) and T. cavernicola (GMBCC 1103, ex-type) revealed 2.35 % (15 / 638 bp, with 2 gaps) base pair differences in ITS, 4.37 % (39 / 892 bp, without gaps) differences in rpb 2, and 0.38 % (3 / 787 bp, without gaps) differences in tef 1 - α. In addition, the PHI test results (Fig. 6 B 3) revealed no significant recombination relationships between T. nujiangense and its phylogenetically related taxa within the dataset. Therefore, we introduce Trichoderma nujiangense as a new species.

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