Phylogeny and taxonomy of the genera of Erysiphaceae, part 6: <italic>Erysiphe</italic> (the “<italic>Microsphaera</italic> lineage” part 2)

This is the sixth contribution in a series devoted to the phylogeny and taxonomy of powdery mildews. This part includes our third treatment of the species of the genus <italic>Erysiphe</italic>. It continues the previous contribution on the phylogenetic-taxonomic assessment of the species belonging to the “<italic>Microsphaera</italic> lineage.” Since this is a large lineage, we have split the treatment of the “<italic>Microsphaera</italic> lineage” into two parts. Phylogenetic trees based on rDNA are supplemented by sequences of additional markers (<italic>CAM, GAPDH, GS, RPB2</italic>, and <italic>TUB</italic>). The “<italic>Erysiphe trifoliorum</italic> complex” is a challenging group that belongs to the “<italic>Microsphaera</italic> lineage.” Adequate clarification of this complex will be possible when additional worldwide multilocus sequence analyses are performed. The new species <italic>Erysiphe acetosae, E. acmisponis, E. lathyrina, E. salmoniana</italic>, and <italic>E. santalicola</italic> are described, and the new combinations <italic>E. biuncinata</italic> and <italic>E. pavoniae</italic> are introduced. Specimens of several species have been sequenced for the first time, particularly North American species, such as <italic>Erysiphe caryae, E. ceanothi, E. juglandis-nigrae</italic>, and <italic>E. ravenelii. Erysiphe syringae</italic> is lectotypified and 15 species names are epitypified in order to provide ex-epitype reference sequences. For other species, non-ex-type reference sequences are proposed for phylogenetic-taxonomic purposes. Ex-type sequences for <italic>Erysiphe baptisiicola, E. sesbaniae, Microsphaera sydowiana, M. umbilici</italic>, and <italic>Oidium pavoniae</italic> have been retrieved. [ABSTRACT FROM AUTHOR]