Phylogeny and taxonomy of the genera of Erysiphaceae, part 3: Cystotheca

ABSTRACT

This contribution is part of a series devoted to the phylogeny and taxonomy of powdery mildews, with an emphasis on North American taxa. An overview of Cystotheca species is given, including references to ex-type sequences or, if unavailable, proposals for representative reference sequences for phylogenetic-taxonomic purposes. The new species C. mexicana is described, based on Mexican collections on Quercus glaucoides × Quercus microphylla and Quercus liebmannii × Q. microphylla. Cystotheca lanestris is reported for the first time worldwide on Quercus laceyi (Collected in Mexico) and on Q. toumeyi (collected in Arizona, USA). Cystotheca lanestris on Q. agrifolia and on Q. cerris is reported for the first time in Mexico. Epitypes with ex-epitype sequences are designated for Cystotheca wrightii, Lanomyces tjibodensis (= C. tjibodensis), Sphaerotheca kusanoi, and S. lanestris (C. lanestris).

KEYWORDS:

• Evolution
• Helotiales
• ITS
• LSU rDNA
• new species
• powdery mildews
• 1 new taxon

ACKNOWLEDGMENTS

We thank the curatorial team at FH and BPI for helping with the herbarium specimens.

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the author(s).

Additional information

Funding

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