| Classification | Fungi: Ascomycota: Erysiphales: Erysiphaceae: Erysiphe |
| Classification 1 | Fungi: Ascomycota: Erysiphales: Erysiphaceae: Microsphaera |
| Harvard University Herbaria Barcode(s) | 01122187 |
| Collector | C. Gross |
| Collector number | HCG 229 |
| Country | United States of America |
| State | Maryland |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Maryland |
| Locality | Baltimore |
| Date Collected | 1936-10-02 |
| Host | On Quercus robur (cult.) |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/ad7a085b-d990-4c51-a61c-2bce08ad27ba |
| Harvard University Herbaria Barcode | 01122187 |
| Herbarium | FH |
| Previous ownership | From the Herbarium of the University of Wisconsin |
| Family | Erysiphaceae |
| Determination | Erysiphe pseudoextensa M. Bradshaw, U. Braun & Quijada |
| Date Determined | 2025 |
| Determination Remarks | [filed under] [current name] |
| Family | Erysiphaceae |
| Determination | Microsphaera extensa Cooke & Peck |
| Determined by | Braun, Uwe |
| Date Determined | 1987-03-24 |
| Annotation Text | var. extensa |
| Family | Erysiphaceae |
| Determination | Erysiphe extensa (Cooke & Peck) U. Braun & S. Takamatsu |
| Family | Erysiphaceae |
| Determination | Microsphaera alni (de Candolle) G. Winter |
| Determined by | Greene, Henry Campbell |
| Determination Remarks | [label name] |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Packet |
| Preparation Method | Dried |
