Phylogeny and taxonomy of the genera of Erysiphaceae, part 5: (the " lineage" part 1).

In this contribution, we offer the fifth installment of a series focusing on the phylogeny and taxonomy of powdery mildews. This paper is the second segment evaluating the genus . The first treatment of focused on phylogenetically basal species in the " lineage." This research presents a phylogenetic-taxonomic assessment of species that form the group previously referred to as the " lineage." Given the size of the group, we split the treatment of this lineage of species into two parts based on their phylogenetic placement. Phylogenetic trees based on ITS+28S data are supplemented by sequences of additional markers (, and ). Included in the analysis of the lineage is the " complex" (group, clade, cluster), which encompasses sequences obtained from an assemblage of species with insufficient resolution in rDNA analyses. Attempts have been made to resolve this group at the species level by applying a multilocus approach. A detailed discussion of the " complex" is provided. Sequences are provided for the first time for several species, particularly North American species, such as , and . Ex-type sequences for and have been retrieved. , and are epitypified with ex-epitype sequences. The new species , and are described, the new combinations , and are introduced, and the new name is proposed.