Megacollybia (Agaricales)
Rep. Tottori Mycol. Inst. 45 : 1–57, 2007. Megacollybia (Agaricales) KAREN W. HUGHES1, RONALD H. PETERSEN1, JUAN LUIS MATA2, NADEZHDA V. PSURTSEVA3, ALEXANDER E. KOVALENKO3, OLGA V. MOROZOVA3, EDGAR B. LICKEY 4, JOAQUIN CIFUENTES BLANCO5, DAVID P. LEWIS6, EIJI NAGASAWA7, ROY E. HALLING8, SEIJI TAKEHASHI9, M. CATHERINE AIME10, TOLGOR BAU11, TERRY HENKEL12 Abstract The genus Megacollybia, originally proposed for M. (Collybia) platyphylla, has traditional- ly been treated as monotaxic. A phylogenetic reconstruction based on ITS rDNA sequences indicates that several species are involved, with strong phylogeographic signal. Although morphological characters are largely qualitative, examination of basidiomata suggests that specimens included in discrete clades can be distinguished at the species level. On these bases (phylogenetic, morphological), several new taxa are proposed: M. clitocyboidea, M. texensis, M. fusca, M. subfurfuracea, M. rodmani (with f. murina) and M. marginata. Tricholomopsis fallax is transferred to Megacollybia; M. platyphylla remains the type species of the genus but appears to be restricted to Europe, Scandinavia and western and central Russia. Key words: Taxonomy, systematics, biogeography, phylogeny, phylogeography 1 Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996-1100 USA. 2 Department of Biology, University of South Alabama, Mobile, AL 36688 USA 3 Komarov Botanical Institute, 2 Prof. Popov Street, St Petersburg, 197376 Russia 4 Department of Biology, Bridgewater College, Bridgewater,
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