Halfbonnets
Hemimycena oregonensis · Family Mycenaceae · Updated October 2026
69US records
3states
Octbusiest month
69 US records since 1972 (59 in the last 10 years)
Last seen Dec 14, 2025 (about 10 months ago) near North San Juan, Yuba County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Washington and Oregon, and the busiest months are Oct, Dec and Nov. (Data as of October 26, 2026; records can lag by weeks.)
⚠ Never eat a wild mushroom based on this site. We show where fungi have been recorded, nothing more. We never say any mushroom is edible or safe, and you shouldn't decide that from any website, app or photo. Many deadly mushrooms look like harmless ones. If someone may have eaten a wild mushroom, call Poison Control at 1-800-222-1222 right away.
Lookalike warning. Many mushrooms, including deadly ones, closely resemble each other, and the only reliable identification comes from an expert looking at the actual specimen (often with spore prints or microscopy). Never use a name, photo or record count on this page to decide what something is.
When it's recorded
Records by month, all years. Busiest: Oct, Dec, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 45 | Dec 14, 2025 |
| Washington | 13 | Oct 21, 2025 |
| Oregon | 11 | Oct 23, 2022 |
Top counties
- Lane County, OR (8) · latest Oct 23, 2022
- Santa Cruz County, CA (7) · latest Feb 17, 2025
- Sonoma County, CA (7) · latest Feb 22, 2025
- San Mateo County, CA (7) · latest Dec 13, 2025
- Marin County, CA (6) · latest Dec 8, 2024
- Contra Costa County, CA (5) · latest Feb 22, 2024
- Thurston County, WA (4) · latest Oct 17, 2025
- Mendocino County, CA (3) · latest Nov 15, 2025
- Humboldt County, CA (3) · latest Nov 26, 2025
- Clallam County, WA (2) · latest Oct 17, 2025
More on this species from GBIF.
Bring along
🍄
Regional mushroom field guideSee on Amazon🍄
Folding mushroom knife with brushSee on Amazon🍄
Wicker foraging basketSee on Amazon🍄
10x hand lens / loupeSee on Amazon🍄
Spore print paperSee on AmazonAs an Amazon Associate we earn from qualifying purchases.