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Geminoarcus maximus sp. nov. and Ceramothyrium brevis sp. nov., two novel aquatic hyphomycetes from Viet Nam

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Abstract

Geminoarcus maximus sp. nov and Ceramothyrium brevis sp. nov. were isolated from fallen leaves collected from Cuc Phuong, Ninh Binh and Phu Quoc National Park, Viet Nam, respectively. They were described and illustrated. Geminoarcus maximus was similar to the others three known species of Geminoarcus in shape and conidial development, but the sizes of the mature conidia were different from the other species. Ceramothyrium brevis (Stanhughesia morph) has one main axis composed of several cells, 4–8 septate, sometimes have one (rarely two) lateral arm. This characteristic shows similarity with the Stanhughesia carniolica (morph of Ceramothyrium). C. brevis differs from S. carniolica in the size of the conidia. The phylogeny based on D1/D2 of the 28S rDNA gene showed that Geminoarcus is nested in the Trichomeriaceae, Chaetothyriales, Eurotiomycetes. Ceramothyrium brevis is nested in Ceramothyrium spp. clade (Chaetothyriaceae, Chaetothyriales, Eurotiomycetes).

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Acknowledgements

This work was conducted under the Joint Research Project on “Taxonomic and ecological studies of microorganisms in Vietnam and the utilization” between the Biological Resource Center, National Institute of Technology and Evaluation, Japan and the Institute of Microbiology and Biotechnology, Vietnam National University and the project “QG 19-70” funded by Vietnam National University, Ha Noi. We thank Mr. Kamijo, NITE, for sequencing in this study.

Funding

This work was conducted under the Joint Research Project on “Taxonomic and ecological studies of microorganisms in Vietnam and the utilization” between the Biological Resource Center, National Institute of Technology and Evaluation, Japan and the Institute of Microbiology and Biotechnology, Vietnam National University and the project “QG 19-70” funded by Vietnam National University, Ha Noi. We thank Mr. Kamijo, NITE, for kindly doing the sequences in this study.

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"LTHY performed the experiments, analyzed the data (morphology and phylogeny), and wrote the manuscript; YT, KA analyzed the data (morphology section) and revised the manuscript; DVH analyzed the data (phylogeny section) and revised the manuscript”.

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Correspondence to Yen Thi Hoang Le.

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Le, Y.T.H., Tsurumi, Y., Van Duong, H. et al. Geminoarcus maximus sp. nov. and Ceramothyrium brevis sp. nov., two novel aquatic hyphomycetes from Viet Nam. Vegetos 33, 641–647 (2020). https://doi.org/10.1007/s42535-020-00148-z

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  • DOI: https://doi.org/10.1007/s42535-020-00148-z

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