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Sydowia japonica, a new name for Leptosphaerulina japonica based on morphological and molecular data

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Abstract

We examined the taxonomic position of Leptosphaerulina japonica, a parasitic fungus on male strobili of Japanese cedar (Cryptomeria japonica) using morphology and molecular phylogeny. Because neither specimens nor illustrations were designated in the original paper, this name is neotypified with a fresh specimen collected from the type locality, Yamagata, Japan. Leptosphaerulina japonica has asci produced in a broad layer arising from the entire base of the locule, stipitate acervuli, and a hormonema-like synanamorph. These characteristics are not typical of the genus Leptosphaerulina (Didymellaceae, Pleosporales). In a molecular phylogenetic analysis of ITS sequences, L. japonica was placed into the Dothideaceae/Dothioraceae, Dothideales. Although muriform ascospores and an anamorph with long stipitate acervuli have not been reported for species in Sydowia, the other morphology and phylogeny support placement of L. japonica in that genus. Thus, a new combination, Sydowia japonica, is proposed.

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Acknowledgments

We are grateful to the curator of the herbaria K for loans of L. thujae specimen. We also thank Amy Y. Rossman for numerous discussions and comments on the taxonomy of the genus Dothiora and Sydowia. This study was supported by the MAFF practical technology development project grant No. 22023 “Development on the scattering prevention of cedar and cypress pollen by using fungi”.

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  1. Department of Forest Microbiology, Forestry and Forest Products Research Institute, Matsunosato 1, Tsukuba, Ibaraki, 305-8687, Japan

    Yuuri Hirooka, Hayato Masuya, Mitsuteru Akiba & Takanori Kubono

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  1. Yuuri Hirooka
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  2. Hayato Masuya
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  3. Mitsuteru Akiba
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  4. Takanori Kubono
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Correspondence to Yuuri Hirooka.

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Hirooka, Y., Masuya, H., Akiba, M. et al. Sydowia japonica, a new name for Leptosphaerulina japonica based on morphological and molecular data. Mycol Progress 12, 173–183 (2013). https://doi.org/10.1007/s11557-012-0823-0

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