Phylogenetic relationships within Paxillus s. I-(Basidiomycetes, Boletales): Separation of a Southern hemisphere genus

This study aimed to test the monophyly and present a generic concept of Pax illus s.l. Of special interest were the Southern hemisphere representatives of this genus. Using the primer combination LR0R-LR5, DNA sequence data we re generated from the nuclear encoded 28S gene. A data set containing 900 b ases was created for 30 different species. Phylogenetic analysis showed 3 m ain monophyletic groups, also supported by morphological, anatomical, ecolo gical and chemical data. Taxonomic interpretation of these clearly differen tiated groups corresponded to the genera Paxillus s. str. and Tapinella and lead to the proposal of a new Southern hemisphere genus, Austro-paxillus, mycorrhizal with Nothofagus. New combinations are proposed.