| Kingdom: Fungi |
| Phylum: Ascomycota |
| Subphylum: Pezizomycotina |
| Class: Leotiomycetes |
| Order: Erysiphales |
| Family: Erysiphaceae |
| Genus: Erysiphe |
| Subject: Erysiphe poeltii U. Braun |
| Kingdom: Plantae |
| Phylum: Magnoliophyta |
| Class: Magnoliopsida |
| Subclass: Rosidae |
| Order: Rosales |
| Family: Hydrangeaceae |
| Genus: Hydrangea |
| Subject: Hydrangea spp. L. |