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

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 View 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 View Figure 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 View Figure 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.