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First published on October 6, 2009
Mycologia 2009
DOI: 10.3852/09-137
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© 2009 by The Mycological Society of America

Verrucostoma, a new genus in the Bionectriaceae from the Bonin Islands, Japan.


Yuuri Hirooka 1,*
Takao Kobayashi 2
Tsuyoshi Ono 3
Amy Y. Rossman 4
Priscila Chaverri 5

     1 Systematic Mycology and Microbiology Laboratory, USDA-ARS, 10300 Beltsville Ave., Beltsville, Maryland, 20705, United States of America
2 Tokyo University of Agriculture, Setagaya, Tokyo
3 Tokyo Metropolitan Agricultural and Forestry Research Center, Tachikawa, Tokyo
4 USDA-ARS, Beltsville, MD, 20705, United States of America
5 Howard University, Washington, DC, 20059, United States of America

Verrucostoma freycinetiae gen. et sp. nov. is described and illustrated from specimens on dead leaves of Freycinetia boninensis (Pandanaceae) collected in Hahajima, Bonin (Ogasawara) Islands, Tokyo, Japan. The genus is characterized by having pale orange perithecia with protuberances around the perithecial apex, no color change in 3% potassium hydroxide and lactic acid, unitunicate asci, spinulose ascospores and an Acremonium-like anamorph. Morphological characters were compared with other genera in the Bionectriaceae and Nectriaceae (Hypocreales). Verrucostoma is morphologically similar to Bionectria (Bionectriaceae) from which it differs in the formation of conspicuous protuberances around the perithecial apex and the Acremonium-like anamorph. Moreover, molecular analyses of Verrucostoma and other members of the Bionectriaceae and Nectriaceae based on {alpha}-actin, large subunit nuclear ribosomal DNA and RNA polymerase II subunit 1 sequences support the conclusions based on morphological data. The results of this study confirm that V. freycinetiae is distinct from other genera among the Nectria-like fungi and represents a new genus belonging to the Bionectriaceae.

Key words: Ascomycota, Freycinetia, Hypocreales, molecular systematics, Pandanaceae

* Systematic Mycology and Microbiology Laboratory, USDA-ARS, 10300 Beltsville Ave., Beltsville, Maryland, 20705, United States of America Yuuri.Hirooka{at}ars.usda.gov






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Copyright © 2009 by The Mycological Society of America.