Diversity of (, ) in Europe, and typification of .

In this study, eight species of are recognized from Europe: , aff. 1, , cf, , . cf. , , and . Different candidates for the application of the name are evaluated and the best fit to the description is selected; lecto- and epitypes are chosen to fix the name. and are also epitypified and a new species, , is described. The infrageneric classification is revised and a new subgenus and three new sections, , and are introduced. The former sections and are elevated to subgeneric level. Comparison of the ITS regions (nuc rDNA ITS1-5.8S-ITS2) of all species studied shows that there is a minimum interspecific difference of 1.5 %, with the exception of the two species belonging to sect. which differ by a minimum of 0.9 %. Ecological specimen data indicate that species of form basidiomes under members of , with a general preference for species of . Five European species have been recorded under , while and have also been recorded as tree associates, although the detailed nutritional relationships of the genus, involving other suilloid fungi in particular, have yet to be fully clarified.