New Boletaceae taxa from Guyana: Binderoboletus segoi gen. and sp. nov., Guyanaporus albipodus gen. and sp. nov., Singerocomus rubriflavus gen. and sp. nov., and a new combination for Xerocomus inundabilis

Abstract

Binderoboletus segoi gen. and sp. nov., Guyanaporus albipodus gen. and sp. nov. and Singerocomus rubriflavus gen. and sp. nov. (Boletaceae, Boletales, Basidiomycota) are described from the Pakaraima Mountains and adjacent lowlands of Guyana. Xerocomus inundabilis, originally described from the central Brazilian Amazon and based solely on the type collection, is redescribed from numerous collections from Guyana and transferred into Singerocomus. These boletes occur in Neotropical forests dominated by ectomycorrhizal trees in the genera Dicymbe (Fabaceae subfam. Caesalpinioideae), Aldina (Fabaceae subfam. Papilionoideae) and Pakaraimaea (Dipterocarpaceae). Three of the species were repeatedly found in a multiyear sporocarp survey in Dicymbe corymbosa-monodominant forest. Macromorphological, micromorphological, habitat and multilocus DNA sequence data are provided for each species. A molecular phylogenetic analysis based on a large taxon set across the Boletaceae justifies erection of the new genera.

• Agaricomycetes
• Boletineae
• Caesalpinioideae
• Dipterocarpaceae
• ectomycorrhizal fungi
• Guiana Shield

Acknowledgments

For financial support the authors thank the following: National Science Foundation (NSF) DEB-0918591 and the National Geographic Society’s Committee for Research and Exploration grants 6679-99, 7435-03 and 8481-08 to TWH, NSF DEB-0732968 and a Linnaean Society Systematics Research Fund award to MCA, and a University of Guyana Sabbatical Leave grant to DH. MES support was provided by the University of Florida’s Institute for Food and Agricultural Sciences and NSF DEB-1354802. Field assistance in Guyana was provided by M. Chin, P. Henkel, C. Andrew, V. Joseph, P. Joseph, F. Edmund and L. Edmund. Kevin Amses provided the scanning electron micrographs. Research permits were granted by the Guyana Environmental Protection Agency. Two anonymous reviewers provided helpful comments on an earlier version of the manuscript. This paper is No. 208 in the Smithsonian Institution’s Biological Diversity of the Guiana Shield Program publication series.