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Cryptolepiota, a new sequestrate genus in the Agaricaceae with evidence for adaptive radiation in western North America

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Abstract
  • Phylogenetic analyses based on nLSU and ITS sequence data indicate that the sequestrate genus Gigasperma is polyphyletic. Gigasperma cryptica, which is known only from New Zealand, has affinities with the Cortinariaceae whereas G. americanum and two additional undescribed taxa from western North America are derived from Lepiota within the Agaricaceae. The three North American taxa appear to be recently evolved and are closely related. They occur in similar environments and form a well supported clade indicating that adaptive radiation has occurred within this group of fungi. An independent genus with sequestrate fructifications, Cryptolepiota is proposed to accommodate the three species in this clade. Cryptolepiota microspora and C. mengei are described as new, and G. americanum is transferred to Cryptolepiola. Gigasperma cryptica is illustrated and compared with the species of Cryptolepiota.
  • Keywords: Gigasperma, Phylogenetics, Fungi, Basidiomycota, Cortinariaceae
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  • Kropp, B. R., Albee-Scott, S., Castellano, M. A., & Trappe, J. M. (2012). Cryptolepiota, a new sequestrate genus in the agaricaceae with evidence for adaptive radiation in western north america. Mycologia, 104(1), 164-174. doi: 10.3852/11-046
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  • 104
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  • 1
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  • We thank the Utah Agricultural Experiment Station for financial support of this research.
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