Cortinarius majestaticus comb. nov.: phylogenetic evidence for the transfer of Descolea majestatica to Cortinarius
Descolea majestatica is an agaric with features described as intermediate between the genera Descolea Singer and Rozites P. Karst. (≡ Cortinarius). Molecular phylogenetic analysis of nuclear ribosomal internal transcribed spacer (ITS), large ribosomal subunit (LSU) and RNA polymerase second largest subunit (RPB2) sequences indicates that D. majestatica is nested within the genus Cortinarius, with its closest relative a sequestrate Cortinarius species from Argentina. Taxonomic recombination is made to restore the monophyly of Cortinarius and Descolea.
KeywordsBasidiomycota Cortinariaceae Molecular phylogenetics New Zealand
We thank Nicolás Pastor, Instituto Multidisciplinario de Biología Vegetal CONICET – UNC, Córdoba, Argentina, for valuable information on Cortinarius sp. Trappe 26352, herbaria PDD and OTA for generous loans of specimens and permission to extract DNA from them, Stewart Bell for expert field assistance, the Department of Botany, University of Otago for financial support to DAO. Some samples used for analysis were collected at the New Zealand Fungal Foray and participants are gratefully acknowledged for their time and effort. This project was initiated as a class project in the paper BTNY326 Plant Diversity and Evolution at the University of Otago, and some DNA sequencing and preliminary phylogenetic analyses were expertly conducted by T.A.H. Bostock, J.J. Boucher, P. Choo, A.K. Fitzgerald, M.B. Janke, A.D. Johnson, S.G.J. Logan, A.M. Luckhurst, K.R. Mathewson, J.G. Milner, R.D. Mitchell, N.J. Napier, J.A. Rich, B.A. Robinson, J.R. Ross, N. Sanchez, P.C. Shelling, N.J.K. Soloi, D. Teramura, J.A.I. Tyson, S.L. Walmsley-Bartlett, K.A. Wendelgelst, R. Macdonald, M. Buxton and X. Wang.
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