Mycologia
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DOI: 10.3852/mycologia.98.5.801
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Mycologia, 98(5), 2006, pp. 801-814.
© 2006 by The Mycological Society of America

Ophiostoma breviusculum sp. nov. (Ophiostomatales, Ascomycota) is a new species in the Ophiostoma piceae complex associated with bark beetles infesting larch in Japan


Wen-Hsin Chung 1

     Department of Plant Pathology, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 402, Taiwan R.O.C.

Jae-Jin Kim

     Division of Environmental Science & Ecological Engineering, Korea University, Seoul 136-701, Korea

Yuichi Yamaoka 1

     Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8687, Japan

Adnan Uzunovic

     Forintek Canada Corp., Western Laboratory, 2665 East Mall, Vancouver, B.C., V6T 1W5 Canada

Hayato Masuya

     Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan

Colette Breuil

     Department of Wood Science, Faculty of Forestry University of British Columbia, 24 Main Mall, Vancouver, B.C., V6T 1Z4 Canada

A new species of the Ophiostoma piceae -complex was isolated from bark beetles and the insect galleries of Larix kaempferi in Japan. This species was described as Ophiostoma breviusculum. The fungus was morphologically similar to O. piceae and O. quercus. However the average length of the perithecial necks and synnemata were shorter than for O. piceae and O. quercus. Synnemata morphological characteristics also differentiated O. breviusculum from the other species of the Ophiostoma piceae - complex isolated from conifers. Mating tests demonstrated that this fungus did not produce perithecia with O. floccosum, O. piceae and O. quercus. In phylogenetic trees using rDNA ITS O. breviusculum was placed in a clade with O. canum, O. piceae and O. subalpinum, but when using ß-tubulin it was placed into a separate clade.

Key words: bark beetle, insect-fungus relationship, Larix kaempferi, new species, Ophiostoma breviusculum, Ophiostoma piceae-complex

1 Corresponding authors.
Wen-Hsin Chung. Department of Plant Pathology, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 420, Taiwan, R.O.C. Tel: +886-4-22840780; Fax: +886-4-22877585. E-mail: wenchung{at}dragon.nchu.edu.tw
Yuichi Yamaoka. Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan. Tel: +81-29-853-4707 Fax: +81-29-853-4707. E-mail: yyamaoka{at}sakura.cc.tsukuba.ac.jp






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Copyright © 2006 by The Mycological Society of America.