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Three Novel Cheiroid Hyphomycetes in Dictyocheirospora and Dictyosporium ( Dictyosporiaceae ) from Freshwater Habitats in Guangdong and Guizhou Provinces, China.
Journal of Fungi (Basel, Switzerland) 2024 March 29
Over the past two decades, numerous novel species have been identified within Dictyosporiaceae , primarily in Dictyocheirospora and Dictyosporium . A recent monograph has revealed that these two genera exhibit a distinct preference for freshwater habitats, particularly in southern China. However, further investigation into the distribution and diversity of the two genera in Guangdong and Guizhou Provinces remains insufficient. In this study, we conducted an analysis of four intriguing cheiroid hyphomycetes collected from flowing rivers in these two regions. Through morphological and phylogenetic analyses incorporating combined LSU, SSU, ITS, and tef1-α sequence data, we have identified them as a novel species in Dictyocheirospora ( Dictyoc. submersa sp. nov.), two novel species in Dictyosporium ( Dictyos. guangdongense sp. nov. and Dictyos. variabilisporum sp. nov.), and one previously documented species ( Dictyos. digitatum ). Specifically, the identification of Dictyos. guangdongense is primarily based on its distinct morphology, characterized by complanate, cheiroid, and brown to dark brown conidia, with a hyaline, short, and atrophied appendage arising from the apical cell of the outer row. In addition, the morphological distinctions between Dictyocheirospora and Dictyosporium are further clarified based on our new data. This study also highlights a few phylogenetic matters regarding Dictyosporiaceae .
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