Phylogenetic and taxonomic re-assessment of the genera and .

The infrageneric classification of the genus has a long history of continuous refinement. Nevertheless, recent studies demonstrated that some of the widely used sections are not monophyletic in their current circumscription. In addition, the genus , or sect. in the traditional sense, was shown to be polyphyletic. In this work, the phylogeny and taxonomy of the sections of and the species attributed to /sect. are analysed based on morphological investigation and a multilocus phylogeny (ITS, LSU, mtSSU, ). Barcode ITS-sequences are provided for 11 type specimens for the first time. The genus is confirmed as a phylogenetically distinct clade. However, species so far treated in /sect. form two further clades in , one as basal clade in sect. and the other as a section on its own, for which the new combination sect. is introduced. sect. is validated as a result of a nomenclatural re-assessment. Lectotypes and epitypes are designated for and . as currently circumscribed is shown to be a complex formed by at least four distinct clades. The re-assessment and emendation of the sections in confirm that the microstructure of the pileus covering is the taxonomically most significant character, while the shape of the basidiospores is less uniform within the sections. Sarawi S, Piepenbring M, Reschke K (2025). Phylogenetic and taxonomic re-assessment of the genera and . : 235-263. doi: 10.3114/fuse.2025.15.11.