Abstract
Species of Cryptocoryneum were taxonomically reassessed on the basis of morphological observations and the results of molecular phylogenetic analysis. Eighteen isolates of Cryptocoryneum species, namely two strains from Africa, three from Europe, and 13 from Japan, were phylogenetically analysed using sequences of nuclear rDNA internal transcribed spacers (ITS) and the partial sequence of the translation elongation factor 1α gene (TEF1). The phylogenetic analysis indicated that Cryptocoryneum species formed a monophyletic clade and were closely related to Lophiotrema (Lophiotremataceae) and Aquasubmersa (incertae sedis) in the Pleosporales (Dothideomycetes). We examined holotype specimens of C. fasciculatum, C. hysterioides, and Torula uniformis and concluded that these species are conspecific, with C. hysterioides having priority. Although C. hysterioides has long been regarded as a synonym of C. condensatum, we consider C. hysterioides to be a distinct species within the genus. We found several cryptic species that were morphologically similar to C. condensatum sensu lato, but that could be separated on the basis of conidial size and the number of conidial arms and conidial septa, characters that seem to be informative for species delimitation within Cryptocoryneum. A total of seven new species, namely C. akitaense, C. brevicondensatum, C. congregatum, C. japonicum, C. longicondensatum, C. paracondensatum, and C. pseudorilstonei, are described and illustrated. A key to species accepted in Cryptocoryneum is provided.
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Acknowledgments
The authors gratefully acknowledge the following herbaria for the loan of material; G, IMI, NYS, PRM, and UPS. We wish to thank editors and anonymous reviewers for constructive comments on the manuscript. We also thank V.A. Mel’nik for providing valuable information about Cryptocoryneum lignicola. This work was partially supported by grants from the Japan Society for the Promotion of Science (JSPS, 25440199 and 26291084) and Hirosaki University Grant for Exploratory Research by Young Scientists.
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Hashimoto, A., Matsumura, M., Hirayama, K. et al. Taxonomy and phylogeny of Cryptocoryneum (Pleosporales, Dothideomycetes). Mycol Progress 15, 45 (2016). https://doi.org/10.1007/s11557-016-1186-8
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DOI: https://doi.org/10.1007/s11557-016-1186-8