Phylogeny and taxonomy of the genera of Erysiphaceae, part 5: Erysiphe(the “Microsphaeralineage” part 1)

ABSTRACTIn 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 Erysiphe. The first treatment of Erysiphefocused on phylogenetically basal species in the “Uncinulalineage.” This research presents a phylogenetic-taxonomic assessment of species that form the group previously referred to as the “Microsphaeralineage.” Given the size of the group, we split the treatment of this lineage of Erysiphespecies into two parts based on their phylogenetic placement. Phylogenetic trees based on ITS+28S data are supplemented by sequences of additional markers (CAM, GADPH, GS, RPB2, and TUB). Included in the analysis of the Microsphaeralineage is the “Erysiphe aquilegiaecomplex” (group, clade, cluster), which encompasses sequences obtained from an assemblage of Erysiphespecies 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 “Erysiphe aquilegiaecomplex” is provided. Sequences are provided for the first time for several species, particularly North American species, such as Erysiphe aggregata, E. erineophila, E. parnassiae, and E. semitosta. Ex-type sequences for Microsphaera benzoinand M. magnusiihave been retrieved. Alphitomorpha penicillata, Microsphaera vanbruntiana, and M. symphoricarpiare epitypified with ex-epitype sequences. The new species Erysiphe alnicola, E. deutziana, E. cornigena, E. lentaginis, and E. sambucinaare described, the new combinations E. lauracearum, E. passiflorae, and E. sambucicolaare introduced, and the new name E. santaliis proposed.