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Mycologia, 96(2), 2004, pp. 260-271.
© 2004 by The Mycological Society of America

Molecular evolution and systematics

Rhizochaete, a new genus of phanerochaetoid fungi


Alina Greslebin 1

     Centro de Investigación y Extensión Forestal Andino Patagónico (CIEFAP), C.C. 14, 9200 Esquel, Chubut, Argentina

Karen K. Nakasone 2

     Center for Forest Mycology Research, Forest Products Laboratory, 1 Gifford Pinchot Drive, Madison, Wisconsin 53726-2398

Mario Rajchenberg

     Centro de Investigación y Extensión Forestal Andino Patagónico (CIEFAP), C.C. 14, 9200 Esquel, Chubut, Argentina

A new basidiomycete genus, Rhizochaete (Phanerochaetaceae, Polyporales), is described. Rhizochaete is characterized by a smooth to tuberculate, pellicular hymenophore and hyphal cords that turn red or violet in potassium hydroxide, monomitic hyphal system of simple or nodose septate hyphae, cystidia, and small, cylindrical to subglobose basidiospores. It morphologically is most similar to Phanerochaete. Analyses of nuclear ribosomal and internal-transcribed spacer region sequence data support a close relationship between Rhizochaete and Phanerochaete. The new taxon R. brunnea, from southern Argentina, is described and illustrated. In addition, the new combinations R. americana, R. borneensis, R. filamentosa, R. fouquieriae and R. radicata are proposed. A key to the species of Rhizochaete is provided.

Key words: Basidiomycetes, Ceraceomyces americanus, Ceraceomyces fouquieriae, internal transcribed spacer region, Phanerochaetaceae, Phanerochaete borneensis, Phanerochaete filamentosa, Phanerochaete radicata, Polyporales, Rhizochaete brunnea, ribosomal DNA, taxonomy




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