Abstract
A study of freshwater fungi in Thailand led to the discovery of Mycoenterolobium aquadictyosporium sp. nov. Evidence for the novelty and placement in Mycoenterolobium is based on comparison of morphological data. The new species differs from the type species, M. platysporum, in having shorter and wider conidia, and from M. flabelliforme in having much longer and wider conidia. The hyphomycetous genus Mycoenterolobium is similar to Cancellidium but differs in the arrangement of conidial rows of cells at the attachment point to the conidiophores. The conidia of the former are made up of rows of cells, radiating in a linear pattern from a single cell attached to the conidiophore, while in Cancellidium, adherent rows of septate branches radiate from the conidiophore. Cancellidium conidia also contain branched chains of blastic monilioid cells arising from the conidia, while these are lacking in Mycoenterolobium. At maturity in Mycoenterolobium, the two conidial lobes unite and are closely appressed. Phylogenetic analyses based on a combined LSU, SSU, ITS, TEF1-α, and RPB2 loci sequence data support the placement of Mycoenterolobium aquadictyosporium close to the family Testudinaceae within Pleosporomycetidae, Dothideomycetes. The novel species Mycoenterolobium aquadictyosporium is described and illustrated and is compared with other morphologically similar taxa.
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Acknowledgments
Mark S. Calabon is grateful to the Mushroom Research Foundation and the Department of Science and Technology, Science Education Institute (Philippines). MS Calabon is thankful to Dr. Eleni Gentekaki for her comments and suggestions in the phylogenetic tree. The authors are grateful to DF Bao for the Cancellidium photo. The two anonymous reviewers are also acknowledged for their useful comments.
Funding
Saranyaphat Boonmee would like to thank the Thailand Research Fund (Grant No. TRG6180001) and Plant Genetic Conservation Project under the Royal Initiation of Her Royal Highness Princess Maha Chakri Sirindhorn-Mae Fah Luang University. Kevin D. Hyde thanks the Thailand Research Fund grant entitled “Impact of climate change on fungal diversity and biogeography in the Greater Mekong Subregion” (Grant No. RDG6130001). E. B. Gareth Jones is supported under the Distinguished Scientist Fellowship Program (DSFP), King Saud University, Kingdom of Saudi Arabia. Mingkwan Doilom thanks the 5th batch of Postdoctoral Orientation Training Personnel in Yunnan Province (Grant No. Y934283261) and the 64th batch of China Post-doctoral Science Foundation (Grant No. Y913082271).
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Calabon, M.S., Hyde, K.D., Jones, E.B.G. et al. Mycoenterolobium aquadictyosporium sp. nov. (Pleosporomycetidae, Dothideomycetes) from a freshwater habitat in Thailand. Mycol Progress 19, 1031–1042 (2020). https://doi.org/10.1007/s11557-020-01609-0
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DOI: https://doi.org/10.1007/s11557-020-01609-0