#  New Publications from HUH Research Fellow Michael Bradshaw 

 





October 26, 2022

 

 

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 HUH Research Fellow Michael Bradshaw and collegues have two new publications out in *Mycologia* on the phylogeny and taxonomy of Erysiphaceae*.*

 **Phylogeny and taxonomy of the genera of Erysiphaceae, part 1: *Golovinomyces***  
ABSTRACT  
Powdery mildews are a monophyletic group of obligate plant pathogenic fungi in the family Erysiphaceae. Powdery mildews are economically important in that they cause damage to many agriculturally significant crops and plants in ecologically important habitats. In this contribution, we introduce a new series of publications focusing on the phylogeny and taxonomy of this group, with an emphasis on specimens collected from North America. The first part of the series focuses on the genus *Golovinomyces* and includes a section detailing the powdery mildew species concept. We conducted analyses of *Golovinomyces* spp. with available rDNA sequence data from GenBank and supplemented the data set with rDNA (ITS, 28S, IGS) as well as protein-coding (*GAPDH*) data from 94 North American collections. Many of the species evaluated are included in phylogenetic and morphological analyses for the first time, including the American species *G. americanus, G. brunneopunctatus, G. californicus, G. greeneanus, G. hydrophyllacearum*, and *G. sparsus*. A special emphasis was placed on acquiring ex-type or ex-epitype sequences or presenting reference sequences for phylogenetic-taxonomic purposes. Three new species, *G. eurybiarum, G. galiorum*, and *G. malvacearum*, are described, and the new combinations *G. fuegianus, G. mutisiae*, and *G. reginae* are introduced. Ex-holotype sequences of *Erysiphe sparsa* (≡ *G. sparsus*) reveal that it should be reduced to synonymy with *G. ambrosiae*, and ex-epitype sequences of *G. valerianae* reveal that it should be reduced to synonymy with *G. orontii*. Multiple epitypes are designated with ex-epitype sequences.

 Michael J. Bradshaw, Uwe Braun & Donald H. Pfister (2022) Phylogeny and taxonomy of the genera of Erysiphaceae, part 1: *Golovinomyces*, Mycologia, DOI: [10.1080/00275514.2022.2115419](https://doi.org/10.1080/00275514.2022.2115419)

 **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.

 Michael J. Bradshaw, Uwe Braun, Monika Götz & Donald H. Pfister (2022) Phylogeny and taxonomy of the genera of Erysiphaceae, part 2: *Neoerysiphe*, Mycologia, DOI: [10.1080/00275514.2022.2115420](https://doi.org/10.1080/00275514.2022.2115420)



 

 

 



 

 

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