| Classification | Fungi: Ascomycota: Erysiphales: Erysiphaceae: Erysiphe |
| Classification 1 | Fungi: Ascomycota: Erysiphales: Erysiphaceae: Microsphaera |
| Harvard University Herbaria Barcode(s) | 01122185 |
| Type Status | Holotype |
| Collector | M. L. Fernald, B. H. Long & R. F. Smart |
| Country | United States of America |
| State | Virginia |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Virginia |
| Locality | Petersburg |
| Date Collected | 1936-10-18 |
| Host | On Quercus alba |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/0c0a1d67-365c-45b8-816e-5d391ce18769 |
| Harvard University Herbaria Barcode | 01122185 |
| Herbarium | FH |
| Family | Erysiphaceae |
| Type Status | Holotype |
| Holotype of | Erysiphe pseudoextensa M. Bradshaw, U. Braun & Quijada |
| Determination Remarks | [filed under] [current name] |
| Taxon Reference | (for Erysiphe pseudoextensa M. Bradshaw, U. Braun & Quijada) Forest Pathol. 2025. 55: e70005, 19. |
| Family | Erysiphaceae |
| Determination | Microsphaera extensa Cooke & Peck |
| Determined by | Braun, Uwe |
| Date Determined | 1982-02-09 |
| Annotation Text | (somewhat intermediate between var. extensa and var. curta Braun) |
| Family | Erysiphaceae |
| Determination | Erysiphe extensa (Cooke & Peck) U. Braun & S. Takamatsu |
| Family | Erysiphaceae |
| Determination | Microsphaera alni (de Candolle) G. Winter |
| Determined by | Linder, David Hunt |
| Determination Remarks | [label name] |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Packet |
| Preparation Method | Dried |
