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

ABSTRACT

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.

KEYWORDS:

• Evolution
• Helotiales
• ITS-28S rDNA
• new combinations
• powdery mildews
• 1 new taxon

ACKNOWLEDGMENTS

We would like to thank the curatorial team at FH for helping with the herbarium specimens. We would also like to thank Tom Potterfield and Elan Alford from the Mt. Cuba Center for help with specimen collection.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Funding

We would like to thank the Harvard University Herbaria Research Fellowship, Daniel E. Stuntz Memorial Foundation, the Puget Sound Mycological Society, and the Sonoma County Mycological Association for funding this research.