Ectomycorrhizal fungal taxa recovered as sporocarps in savanna-fringing forests dominated by host trees Pakaraimaea dipterocarpacea and Dicymbe jenmanii at the Pegaima site in the Upper Mazaruni Basin during 2011–2012.

A total of 82 fungal species were found as sporocarps and 26 of these (bold) have not been collected from other study sites in Guyana. For comparison, the voucher numbers are shown for those taxa that have been found at nearby Potaro rainforest sites. GenBank numbers for ITS ribosomal DNA sequences are given for species where available.1Taxa lacking epithets are morphologically distinct but as yet unidentified to the species level; taxa with epithets followed by “ined.” have been tentatively determined as new to science but are yet to be formally described.2ECM lineages as identified by Tedersoo et al. (2010) except for the/agaricalesTH9235 lineage which is documented here for the first time.3Vouchers with TH (Terry Henkel) and JKU (Jessie K. Uehling) numbers are housed at Humboldt State University whereas MCA (M. Cathie Aime) numbers are housed at Purdue University.4GenBank numbers refer to specimens collected at the Potaro rainforest sites (see Smith et al., 2011 and Henkel et al. 2012) except in cases where a given species is only known from the Pegaima site.5Known to be a complex of cryptic species.