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Synnematotriadelphia gen. nov. (S. stilboidea comb. nov. and S. synnematofera comb. nov.) and Triadelphia hexaformispora sp. nov. in the family Triadelphiaceae

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Abstract

During our studies of microfungi from Thailand, Triadelphia hexaformispora sp. nov. collected from decaying wood in a freshwater habitat in Nan Province, Thailand, is described and illustrated. Based on newly generated sequences of the nuclear ribosomal DNA and partial sequence of the second largest subunit of RNA polymerase, Triadelphia species clustered in two monophyletic sister clades in Triadelphiaceae (Microascales, Hypocreomycetidae, Sordariomycetes), one clade accommodates T. heterospora, the type species of Triadelphia, T. diversa, T. loudetiae, T. hexaformisspora, and T. romanica and the second clade incudes T. moubasheri, T. pulvinata, and T. disseminata. Two other species, Triadelphia stilboidea and T. synnematofera (morphological data only) group in a separate clade for which we propose the new genus Synnematotriadelphia. Molecular clock analyses suggest that Triadelphiaceae evolved in the middle Cretaceous, ca. 105 (74–142) million years ago.

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Acknowledgments

The authors wish to thank Drs. Somvong Tragoonrung, Wonnop Visessanguan, and Sissades Tongsima for their support with fungal research at BIOTEC and National Biobank of Thailand (NBT). Part of this work was presented as an oral presentation by the corresponding author at the Asian Mycological Congress (AMC) in Ho Chi Minh City, Vietnam, in October 2017. Gareth Jones is supported by the Distinguished Scientist Fellowship Program (DSFP), King Saud University, Kingdom of Saudi Arabia. The authors are very thankful to Profs. Pedro W. Crous (the Westerdijk Fungal Biodiversity Institute) and Keith A. Seifert (Ottawa Research and Development Centre) for their constructive comments during AMC2017 on the draft manuscript. The two anonymous reviewers and Mycological Progress section editor Hans-Josef Schroers are also acknowledged for their useful comments.

Funding

This work was funded by National Science and Technology Development Agency (NSTDA) infrastructure grant no. P-14-51395 and partially funded by grant nos. P-15-51111 and NBT-2000026.

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Chuaseeharonnachai, C., Suetrong, S., Nuankaew, S. et al. Synnematotriadelphia gen. nov. (S. stilboidea comb. nov. and S. synnematofera comb. nov.) and Triadelphia hexaformispora sp. nov. in the family Triadelphiaceae. Mycol Progress 19, 127–137 (2020). https://doi.org/10.1007/s11557-019-01547-6

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