Phylogeny and taxonomy of the genera of Erysiphaceae, part 2: Neoerysiphe .

The second contribution to a new series devoted to the phylogeny and taxonomy of powdery mildews is presented. An overview of species is given, including references to ex-type sequences or, if unavailable, representative reference sequences for phylogenetic-taxonomic purposes are provided. The new species is described, and is reduced to synonymy with . Epitypes with ex-epitype sequences are designated for , and . Based on phylogenetic analyses, it has been demonstrated that is confined to its type host, (= ), and other North and South American parasites on Asteraceae hosts, previously assigned to this species, pertain to . The first record of from Europe (Germany) on cultivated was confirmed by sequencing. Sequence analysis of type material of reveals that this species should be excluded from ; however, the true affinity of this taxon is not yet clear.