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

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