Systematics of Pacific Northwestern species of the genus Gymnomyces inferred from nuclear ribosomal DNA internal transcribed spacer sequences Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/d791sm450

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  • Gymnomyces is an ectomycorrhizal basidiomycete genus in the family Russulaceae estimated to contain less than 50 species worldwide, with 23 species known to occur in the Pacific Northwest. Gymnomyces species are common in Pacific Northwest forests that include Pseudotsuga, Abies, Tsuga, and Quercus. They produce sequestrate (truffle-like) sporocarps with ornamented amyloid spores, which are a common food resource for a suite of mycophagous, both small and large manirrials. Gymnomyces is one of five sequestrate genera (Macowanites, Gymnomyces, Cystangium, Arcangeliella, and Zelleromyces) long recognized as being more closely related to Russulaceae than to other sequestrate fungi as judged from similarities in spore ornamentation, tissue anatomy, and sporocarp morphology. The russuloid dade, where Gymnomyces resides, exhibits a great diversity of sporocarp morphologies. The hymenomycetous forms include sequestrate, resupinate, pileate, and coralloid, with smooth, toothed, lamellate, or poroid sporocarps forms. This dade is complex because it lacks an obvious morphological synapomorphy uniting all of the unique sporocarp forms. In this study I investigated infrageneric relationships in Gymnoinyces to test current taxonomic hypotheses and species concepts. Through phylogenetic analyses of internal transcribed spacer nuclear ribosomal DNA sequences I found that Gymnomyces does not form a monophyletic group, and the ITS region clearly suggests at least six unique lineages of Gymnomyces. Because the ITS data is consistent with the morphological autapomorphies of both G. ellipsosporus and G. gilkeyae, their removal from the genus Gymnomyces is suggested.
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