Phylogenetic taxon definitions and specifiers for Fungi, Dikarya, Ascomycota and Basidiomycota. Capital letters following species names indicate the clade(s) for which they serve as specifiers (F for Fungi, and so on). There are two species of Taphrina in the tree: T. wiesneri, which was included in the reference phylogeny for Basidiomycota, and T. neoformans, which was used in the reference phylogeny for Ascomycota. A. Topology based on James et al. (2006: fig. 1) and Bauer et al. (2015: fig. 2). B. Topology based on Spatafora et al. (2016: fig. 1) and the alternative topology of Bauer et al. (2015), which was described but not illustrated.