Online ISSN : 1618-2545
Print ISSN : 1340-3540
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Phylogeny of the genus Pythium and description of new genera
Shihomi Uzuhashi Motoaki TojoMakoto Kakishima
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2010 Volume 51 Issue 5 Pages 337-365


Phylogeny of the genus Pythium is analyzed based on sequences of the large subunit ribosomal DNA D1/D2 region and cytochrome oxidase II gene region of Pythium isolates and comprehensive species of related taxa belonging to the Oomycetes. The phylogenetic trees show that the genus Pythium is a highly divergent group and divided into five well- or moderately supported monophyletic clades. Each clade is characterized by sporangial morphology such as globose, ovoid, elongated, or filamentous shapes. Based on phylogeny and morphology, the genus Pythium (s. str.) is emended, and four new genera, Ovatisporangium, Globisporangium, Elongisporangium, and Pilasporangium, are described and segregated from Pythium s. lato.

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© 2010, by The Mycological Society of Japan

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