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. 2025 Jul 14:119:335-350.
doi: 10.3897/mycokeys.119.156745. eCollection 2025.

 Yamadazymaakebiae sp. nov. and Y.hainanensis sp. nov. (Debaryomycetaceae, Saccharomycetales) from leaf in China

Peng Wang  1 , Chun-Yue Chai  1 , Qiu-Hong Niu  1 , Feng-Li Hui  1
Affiliations

 Yamadazymaakebiae sp. nov. and Y.hainanensis sp. nov. (Debaryomycetaceae, Saccharomycetales) from leaf in China

Peng Wang et al. MycoKeys. .

Abstract

Members of the genus Yamadazyma are widely distributed and frequently found in plant materials. In an effort to investigate the species diversity within this genus, leaf samples collected from Guizhou and Hainan provinces in China were examined. This study led to the discovery of two previously undescribed taxa. Phenotypic examination, combined with phylogenetic analysis based on concatenated ITS and LSU D1/D2 sequences, confirmed their affiliation with Yamadazyma and supported their designation as novel species. One of the new species, Yamadazymaakebiae sp. nov., is phylogenetically closely related to Y.kanchanaburiensis, whereas Y.hainanensis sp. nov. represents a distinct lineage, clearly separated from other known Yamadazyma species. Detailed descriptions, illustrations, and comparative discussions with their nearest relatives are provided. These findings contribute two additional species to the genus and enhance our understanding of Yamadazyma diversity in China.

Keywords: Ascomycetous yeast; phylloplane; phylogeny; taxonomy.

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Conflict of interest statement

The authors have declared that no competing interests exist.

Figures

Figure 1.
Figure 1.
Phylogenetic tree of Yamadazyma inferred from maximum likelihood (ML) analysis based on a combined ITS and LSU D1/D2 dataset, with BabjeviellainositovoraCBS 8006T as the outgroup. Bootstrap support (BS) ≥ 50% and Bayesian posterior probabilities (BPPs) ≥ 0.95 are shown. Strains marked with “T” are ex-type. The strains from this study are highlighted in bold.
Figure 2.
Figure 2.
Morphology of Yamadazymaakebiae (ex-type, NYNU 22830). A. Colony on YM agar after 3 days at 25 °C; B. Budding cells on YM agar at 25 °C after 3 days; C. Simple pseudohyphae on CM agar after 3 days at 25 °C; D. Pseudohyphae with blastoconidia on CM agar after 7 days at 25 °C. Scale bars: 10 μm.
Figure 3.
Figure 3.
Morphology of Yamadazymahainanensis (ex-type, NYNU 24829). A. Colony on YM agar after 7 days at 25 °C; B. Budding cells on YM agar after 3 days at 25 °C; C. Pseudohyphae with blastoconidia on CM agar after 7 days at 25 °C. Scale bars: 10 μm.
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