Mycologia
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First published on August 31, 2009, doi:10.3852/08-168

Mycologia 2010;102:108.

DOI: 10.3852/08-168
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© 2009 by The Mycological Society of America

Taxonomic reconsideration of a sequestrate fungus, Octaviania columellifera, with the proposal of a new genus, Heliogaster, and its phylogenetic relationships in the Boletales


Takamichi Orihara 1,*
Fumiko Sawada 2
Shiho Ikeda 3
Masahide Yamato 4
Chihiro Tanaka 5
Norihiro Shimomura 4
Makoto Hashiya 6
Koji Iwase 4

     1 The Course of Bioenvironment Science, The United Graduate School of Agricultural Sciences, Tottori University; Research Fellow of the Japan Society for the Promotion of Science, Totori, Tottori, 680-0945, Japan
2 Mycologist Circle of Japan, Fujisawa, Kanagawa
3 Forest Development Technological Institute, Kyoto, Kyoto
4 Fungus/Mushroom Resource and Research Center, Faculty of Agriculture, Tottori University, Tottori, Tottori
5 Kyoto University, Kyoto, Kyoto
6 Botanic Gardens of Toyama, Toyama, Toyama

During taxonomic revision of the genus Octaviania in Japan, we examined herbarium and fresh specimens of O. columellifera and O. asterosperma sensu S. Yoshimi & Y. Doi using morphological and molecular techniques. These two species were identical in both macro- and micromorphological characters, and were clearly different from the generally known O. asterosperma. The identity of the two species and their distinctness from O. asterosperma was further supported by both nuclear large subunit and ITS rDNA phylogeny. The molecular analyses also revealed that O. columellifera shares its lineage with the boletoid mushroom-forming Xerocomus chrysenteron complex, and that it does not form a monophyletic clade with other Octaviania species. Our morphological reevaluation, including transmission electron microscopic observation of basidiospores, clarified the taxonomic boundary between O. columellifera and other Japanese Octaviania species. Accordingly, we propose a new genus, Heliogaster, for O. columellifera with designation of the lectotype. We discuss phylogenetic relationships with Octaviania sensu stricto species and the closely related boletoid (pileate-stipitate) fungi, generic characters of Heliogaster, and intraspecific phylogeny.

Key words: Boletaceae, hypogeous fungi, Octavianina, systematics, taxonomy, truffle-like fungi

* The Course of Bioenvironment Science, The United Graduate School of Agricultural Sciences, Tottori University; Research Fellow of the Japan Society for the Promotion of Science, Totori, Tottori, 680-0945, Japan h2-berg-3f{at}red.megaegg.ne.jp






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Copyright © 2009 by The Mycological Society of America.