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DOI: 10.3852/08-168
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Mycologia, 102(1), 2010, pp. 108-121.
© 2010 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 1,2

     Department of Agrobiology, Graduate School of Agriculture, Tottori University, 4-101 Koyama-chominami, Tottori 680-8553, Japan

Fumiko Sawada

     2-11-12 Tsujido-taiheidai, Fujisawa, Kanagawa 251-0044, Japan

Shiho Ikeda

     Forest Development Technological Institute, Kyoto 612-0855, Japan

Masahide Yamato 3

     Environment Department, General Environmental Technos Co. Ltd., Osaka 541-0052, Japan

Chihiro Tanaka

     Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan

Norihiro Shimomura

     Fungus/Mushroom Resource and Research Center, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan

Makoto Hashiya

     Botanic Gardens of Toyama, Toyama 939-2713, Japan

Koji Iwase

     Fungus/Mushroom Resource and Research Center, Faculty of Agriculture, Tottori University, Tottori 680-8553, Japan

During taxonomic revision of genus Octaviania in Japan we examined herbarium and fresh specimens of O. columellifera and O. asterosperma sensu S. Yoshimi & Y. Doi with 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

1 Corresponding author. E-mail: h_-berg-_f{at}io.ocn.ne.jp






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Copyright © 2010 by The Mycological Society of America.