| Kingdom: Fungi |
| Phylum: Ascomycota |
| Subphylum: Pezizomycotina |
| Class: Sordariomycetes |
| Subclass: Hypocreomycetidae |
| Order: Microascales |
| Family: Ceratocystidaceae |
| Genus: Bretziella |
| Subject: Bretziella fagacearum (Bretz) Z.W. de Beer, Marinc., T.A. Duong & M.J. Wingf. |
| Kingdom: Plantae |
| Phylum: Magnoliophyta |
| Class: Magnoliopsida |
| Subclass: Hamamelidae |
| Order: Fagales |
| Family: Fagaceae |
| Genus: Quercus |
| Subject: Quercus spp. L. |