Chlamydosporoides guizhouensis H. Pan & Zhi. Y. Zhang 2025, sp. nov.

Chlamydosporoides guizhouensis H. Pan & Zhi. Y. Zhang sp. nov. Fig. 3 Etymology. The epithet “ guizhouensis ” (Lat.) refers to Guizhou Province, where the species was collected. Type. China: • Guizhou Province, Guiyang City, Huaxi District, South Campus of Guizhou University, 26°42'23"N, 106°67'17"E, from epiphytic soil of Catalpa ovata G. Don, 28 September 2024, Heng Pan (holotype HMAS 354107, dried culture; ex-type CGMCC 3.29100 = ZY 24.007; ibid. ZY 24.008). Description. Culture characteristics (14 days at 25 ° C): Colony on PDA 31–39 mm diam. flat, gray white to platinum gray from center to margin, nearly circular, margin regular; reverse: light ivory to oyster white from center to margin. Colony on OA 21–25 mm diam. flat, brown beige to dark ivory from center to margin, margin irregular; reverse: green beige. Colony on SNA 33–39 mm diam. fluffy, honey yellow to white from center to margin, hyphae sparse; reverse: white. Hyphae branched, septate, hyaline to brown, smooth, 1–3 μm wide. hyphopodia-like structures creating a cauliflower-like appearance. Conidiogenous cells hyaline, smooth, solitary, cylindrical to clavate, straight or curved, aseptate, 7.5–12.5 (– 18) × 3–6 μm. Conidia chlamydospores-like, solitary, hyaline to brown, rough, non-septate, pyriform, globose to ellipsoid, or irregular shapes, sessile or borne on conidiogenous cells, 5.5–11.5 × 6–9.5 μm (av. 8.6 × 7.4, n = 50). Setae, Conidiomata, Chlamydospores, and Sexual morph unknown. Geographical distribution. Guizhou Province, China. Additional material examined. China: • Guizhou Province, Guiyang City, Huaxi District, South Campus of Guizhou University, 26°42'35"N, 106°67'20"E, from epiphytic soil of Catalpa ovata, 28 September 2024, Heng Pan (ZY 24.009). Notes. Phylogenetic analysis revealed that four new isolates (ZY 24.007 –24.009) formed a distinct subclade with strong statistical support (100 / 1). Morphologically, for differences between Chlamydosporoides guizhouensis and C. sinensis, see the notes on C. sinensis above. Furthermore, in a comparison of ITS and LSU nucleotides, CBS 101143 has 79.2 % and 98.5 % similarity in ITS (466 / 588 bp, 48 gaps) and LSU (821 / 833 bp, one gap), which is different from C. guizhouensis (CGMCC 3.29100).