@ARTICLE{TreeBASE2Ref18577, author = {Takamichi Orihara and Fumiko Sawada and Shiho Ikeda and Masahide Yamato and Chihiro Tanaka and Norihiro Shimomura and Makoto Hashiya and Koji Iwase}, title = {Taxonomic reconsideration of a sequestrate fungus, Octaviania columellifera, with the proposal of a new genus, Heliogaster, and its phylogenetic relationships in the Boletales}, year = {2009}, keywords = {}, doi = {10.3852/08-168}, url = {}, pmid = {}, journal = {Mycologia}, volume = {102}, number = {1}, pages = {108--121}, abstract = {During taxonomic revision of the genus <I>Octaviania</I> in Japan, we examined herbarium and fresh specimens of <I>O. columellifera</I> and <I>O. asterosperma</I> 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 <I>O. asterosperma</I>. The identity of the two species and their distinctness from <I>O. asterosperma</I> was further supported by both nuclear large subunit and ITS rDNA phylogeny. The molecular analyses also revealed that <I>O. columellifera</I> shares its lineage with the boletoid mushroom-forming <I>Xerocomus chrysenteron</I> complex, and that it does not form a monophyletic clade with other <I>Octaviania</I> species. Our morphological reevaluation, including transmission electron microscopic observation of basidiospores, clarified the taxonomic boundary between <I>O. columellifera</I> and other Japanese <I>Octaviania</I> species. Accordingly, we propose a new genus, <I>Heliogaster</I>, for <I>O. columellifera</I> with designation of the lectotype. We discuss phylogenetic relationships with <I>Octaviania sensu stricto</I> species and the closely related boletoid (pileate-stipitate) fungi, generic characters of <I>Heliogaster</I>, and intraspecific phylogeny.} }

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