Leucangium microspermum: Re-examination of Japanese L. carthusianum reveals its taxonomic novelty

編集・出版統括
折原貴道(神奈川県立 生命の星・地球博物館)
E-mail: t_orihara(at)nh.kanagawa-museum.jp
編集委員
木下晃彦(森林総合研究所)
山本航平(国立科学博物館)
大和政秀(千葉大学教育学部)

Editor-in-Chief
Takamichi Orihara (Kanagawa Prefectural Museum of Natural History, Kanagawa, Japan)
E-mail: t_orihara(at)nh.kanagawa-museum.jp
Editors
Akihiko Kinoshita (Forestry and Forest Product Research Institute Kyushu Research Center, Kumamoto, Japan)
Kohei Yamamoto (National Museum of Nature and Science, Ibaraki, Japan)
Masahide Yamaoto (Faculty of Education, Chiba University, Chiba, Japan)
Truffology(日本地下生菌研究会会報)
出版者:日本地下生菌研究会
所在地(事務局:神奈川県立 生命の星・地球博物館
(神奈川県小田原市入生田499)

Publisher:Japanese Association for Truffle Science
Location:Kanagawa Prefectural Museum of Natural History, 499 Iryuda, Odawara, Kanagawa 250-0031, Japan

Authors

Kohei Yamamoto, Hiromi Sasaki, Muneyuki Ohmae, Takamichi Orihara

Abstract

The genus Leucangium (Morchellaceae, Pezizales) is a truffle-like ascomycete that includes the type species L. carthusianum from Europe and North America, as well as a variety from China. Two specimens collected from subalpine conifer forests in Hokkaido in 2004 and 2011 are the only records of the genus in Japan. Since they were identified as L. carthusianum without detailed examination, in-depth morphological observation and phylogenetic analysis were necessary to confirm their taxonomic placement. In this study, we critically reexamined the Japanese specimens. Morphologically, the length of ascospores of the Japanese L. carthusianum was found to be much shorter than that indicated by the original descriptions of the type species and its variety. Phylogenetic analyses based on two nuclear ribosomal DNA regions showed significant genetic divergence between the Japanese specimens and other specimens of L. carthusianum, including the variety from China. Accordingly, we described the second species of the genus Leucangium, L. microspermum, more than a century after the establishment of the genus.

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Bibliography

Journal: Truffology, volume 3 (2020), issue 1, pages 1–7