Phylogeny and taxonomy of Echinodontium and related genera

ABSTRACT

The phylogenetic relationship of eight species of Echinodontium, Laurilia, and Perplexostereum of Russulales were analyzed based on sequences of the nuc rDNA ITS1-5.8S-ITS2 (ITS [internal transcribed spacer]) and D1–D2 domains of nuc 28S rDNA (28S). Our results show that Echinodontium tinctorium, E. ryvardenii, and E. tsugicola represent Echinodontium sensu stricto. Based on morphological and phylogenetic evidence, the new genus Echinodontiellum is established to accommodate Echinodontium japonicum. Amylostereum, Echinodontium, Echinodontiellum, and Larssoniporia form the Echinodontiaceae clade. The Bondarzewiaceae clade includes Bondarzewia, Heterobasidion, Laurilia, and Lauriliella. The new genus Lauriliella is established for the species initially described as Stereum taxodii and Lauriliella taiwanensis new to science. The monotypic genus Perplexostereum forms a distinct clade. A key to the genera in the Echinodontiaceae and Bondarzewiaceae as well to Perplexostereum is provided.

KEYWORDS:

• Bondarzewiaceae
• Echinodontiaceae
• Echinodontiellum
• Laurilia
• Lauriliella

ACKNOWLEDGMENTS

We thank especially Drs. Beatriz Ortiz-Santana, Rita Rentmeester (Center for Forest Mycology Research, U.S. Forest Service), and Sheng-Hua Wu (National Museum of Natural Science, Taiwan) for specimens or cultures loans. We express our gratitude to Dr. Hai-Jiao Li (Chinese Center for Disease Control and Prevention, China) for preparing the line drawings. We thank Dr. Bao-Kai Cui for allowing us to study his specimens.

FUNDING

The research was financed by the National Natural Science Foundation of China (project nos. 31470144 and 31670013).

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Funding

The research was financed by the National Natural Science Foundation of China (project nos. 31470144 and 31670013)