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Background  Previous phylogenetic analyses of species within the genus  Golovinomyces  (Ascomycota ,  Erysiphales), based on ITS and 28S rDNA sequence data, revealed a co-evolutionary relationship between powdery mildew species and hosts of certain tribes of the plant family Asteraceae.  Golovinomyces  growing on host plants belonging to the  Heliantheae  formed a single lineage, comprised of a morphologically differentiated complex of species, which included  G. ambrosiae ,  G. circumfusus , and  G. spadiceus . However, the lineage also encompassed sequences retrieved from  Golovinomyces  specimens on other Asteraceae tribes as well as other plant families, suggesting the involvement of a plurivorous species. A multilocus phylogenetic examination of this complex, using ITS, 28S, IGS (intergenic spacer),  TUB2  (beta-tubulin), and  CHS1  (chitin synthase I) sequence data was carried out to clarify the discrepancies between ITS and 28S rDNA sequence data and morphological differences. Furthermore, the circumscription of species and their host ranges were emended.    Results  The phylogenetic and morphological analyses conducted in this study revealed three distinct species named, viz., (1)  G. ambrosiae  emend. (including  G. spadiceus ), a plurivorous species that occurs on a multitude of hosts including,  Ambrosia  spp., multiple species of the  Heliantheae  and plant species of other tribes of Asteraceae including the Asian species of  Eupatorium ; (2)  G. latisporus  comb. nov. (≡  Oidium latisporum ), the closely related, but morphologically distinct species confined to hosts of the  Heliantheae  genera  Helianthus ,  Zinnia , and most likely  Rudbeckia ; and (3)  G. circumfusus  confined to  Eupatorium cannabinum  in Europe.    Conclusions  The present results provide strong evidence that the combination of multi-locus phylogeny and morphological analysis is an effective way to identify species in the genus  Golovinomyces .

bmc microbiology

Multi-locus phylogeny and taxonomy of an unresolved, heterogeneous species complex within the genus Golovinomyces (Ascomycota, Erysiphales), including G. ambrosiae, G. circumfusus and G. spadiceus