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The genus Theissenia: T. pyrenocrata, T. cinerea sp. nov., and T. eurima sp. nov

     Institute of Botany, Academia Sinica, Nankang, Taipei 115, Taiwan

Jack D. Rogers

     Department of Plant Pathology, Washington State University, Pullman, Washington 99164-6430

Huei-Mei Hsieh

     Institute of Botany, Academia Sinica, Nankang, Taipei 115, Taiwan

The diagnosis of Theissenia is emended to include taxa that lack a definite central perithecial columella and taxa that feature ascospores with a germ slit. Theissenia cinerea is described as a new species that lacks a perithecial columella; T. eurima is described as a new species with ascospores having a germ slit. The type species, T. pyrenocrata, is redescribed and compared with the new species. The taxonomic position of Theissenia is discussed.

Key words: Nodulisporium, systematics, Xylariaceae

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