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Taxonomy of the Rhizopogon vinicolor species complex based on analysis of ITS sequences and microsatellite loci

     S.U.N.Y. College of Environmental Science and Forestry, Faculty of Environmental and Forest Biology, 350 Illick Hall, Syracuse, New York 13210-2788

Daniel L. Luoma

     Department of Forest Science, Oregon State University, 154 Peavy Hall, Corvallis, Oregon 97331-7501

Randy Molina

     U.S.D.A. Forest Service, Pacific Northwest Research Station, 2300 SW Jefferson Way, Corvallis, Oregon 97331

Joseph W. Spatafora

     Department of Botany and Plant Pathology, Oregon State University, 2082 Cordley Hall, Corvallis, Oregon 97331-2902

We are re-addressing species concepts in the Rhizopogon vinicolor species complex (Boletales, Basidiomycota) using sequence data from the internal-transcribed spacer (ITS) region of the nuclear ribosomal repeat, as well as genotypic data from five microsatellite loci. The R. vinicolor species complex by our definition includes, but is not limited to, collections referred to as R. vinicolor Smith, R. diabolicus Smith, R. ochraceisporus Smith, R. parvulus Smith or R. vesiculosus Smith. Holo- and/or paratype material for the named species is included. Analyses of both ITS sequences and microsatellite loci separate collections of the R. vinicolor species complex into two distinct clades or clusters, suggestive of two biological species that subsequently are referred to as R. vinicolor sensu Kretzer et al and R. vesiculosus sensu Kretzer et al. Choice of the latter names, as well as morphological characters, are discussed.

Key words: fungal species concepts, internal transcribed spacers, microsatellite markers, Rhizopogon

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