| Classification | Fungi: Ascomycota: Erysiphales: Erysiphaceae: Erysiphe |
| Harvard University Herbaria Barcode(s) | 01131007 |
| Collector | D. E. Boufford |
| Collector number | 46013 |
| Country | United States of America |
| State | Massachusetts |
| Geography | North America: North America (CA, US, MX) (Region): United States of America: Massachusetts: Franklin County: Erving |
| Locality | Northwest part of town, east of Northfield Mountain Reservoir near south base of Hermit Mountain near ledges referred to locally as 'Hermit's Castle' |
| Georeference | 42 36 48 N, 72 25 27 W |
| Date Collected | 2022-09-25 |
| Verbatim Elevation | 275 m. |
| Habitat | Mixed broadleaved deciduous forest with Quercus alba, Q. coccinea, Q. montana, Q. rubra and Q. velutina with Fagus grandifolia, Fraxinus americana, Acer rubrum and numerous stump sprouts of Castanea dentata |
| Container | Plants of United States of America |
| Host | On Quercus rubra Linneaus |
| GUID | http://purl.oclc.org/net/edu.harvard.huh/guid/uuid/ca9ea40f-4517-4552-9c4e-9ce4fa661f26 |
| Harvard University Herbaria Barcode | 01131007 |
| Herbarium | FH |
| Family | Erysiphaceae |
| Determination | Erysiphe extensa (Cooke & Peck) U. Braun & S. Takamatsu |
| Date Determined | 2025 |
| Determination Remarks | [filed under] [current name] |
| Family | Erysiphaceae |
| Determination | Erysiphe sp. |
| Determined by | Bradshaw, Michael James |
| Date Determined | 2022-09-29 |
| Determination Remarks | [label name] |
| Sex | not determined |
| Phenology | NotDetermined |
| Preparation Type | Packet |
| Preparation Method | Dried |
