Chlamydosporoides H. Pan & Zhi. Y. Zhang 2025, gen. nov.

Chlamydosporoides H. Pan & Zhi. Y. Zhang gen. nov. Etymology. Refers to its production of chlamydospore-like conidia. Geographical distribution. Guizhou Province, China. Description. Hyphae branched, septate, hyaline to brown, smooth, sometimes hyphopodia-like structures creating a cauliflower-like appearance. Conidiogenous cells hyaline, smooth, solitary, cylindrical to clavate, straight or curved, aseptate. Conidia chlamydospore-like, solitary, hyaline to brown, non-septate, pyriform, globose to ellipsoid, or irregular shapes, sessile or borne on conidiogenous cells. Chlamydospores borne on hyphae, solitary, catenate, or grape-like, brown to dark brown. Setae, Conidiomata, and Sexual morph unknown. Type species. Chlamydosporoides sinensis H. Pan & Zhi. Y. Zhang. Notes. Currently, the family Wiesneriomycetaceae comprises eight genera: Excipulariopsis, Heveicola, Parawiesneriomyces, Phalangispora, Pseudogliophragma, Setosynnema, Speiropsis, and Wiesneriomyces (Wijayawardene et al. 2020; Xu et al. 2022; Hyde et al. 2024). Molecular sequences for all genera are available in public databases (Table 1, Xu et al. 2022; Yang et al. 2023). Our multi-locus phylogenetic analysis revealed that, with the exception of Wiesneriomyces and Parawiesneriomyces, the remaining genera formed a strongly supported monophyletic clade (Fig. 1). The novel isolates obtained in this study, along with ‘ Wiesneriomyces laurinus ’ (CBS 101058 and CBS 101143), constituted a distinct subclade within Wiesneriomycetaceae (Fig. 1). Morphologically, no sexual morph has been reported in this family to date, while all known genera share the characteristic of producing conidia in acropetal chains (Xu et al. 2022). The newly proposed genus is primarily distinguished from other genera in Wiesneriomycetaceae by the absence of conidia produced in acropetal chains, setae, synnemata, sporodochium or stroma.