Fib King
Boletus fibrillosus · Family Boletaceae · Updated October 2026
111US records
4states
Octbusiest month
111 US records since 1948 (39 in the last 10 years)
Last seen Dec 5, 2025 (about 11 months ago) in Point Reyes National Seashore, 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, Nov and Sep. (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, Nov, Sep.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 59 | Dec 5, 2025 |
| Washington | 21 | Nov 28, 2025 |
| Oregon | 19 | Oct 27, 2025 |
| Idaho | 12 | Sep 18, 1990 |
Top counties
- Mendocino County, CA (30) · latest Nov 25, 1992
- Humboldt County, CA (17) · latest Nov 26, 2024
- Bonner County, ID (6) · latest Oct 5, 1973
- Lane County, OR (6) · latest Oct 5, 2024
- King County, WA (5) · latest May 24, 2008
- Marin County, CA (4) · latest Dec 5, 2025
- Whatcom County, WA (4) · latest Nov 28, 2025
- Del Norte County, CA (3) · latest Nov 10, 2014
- Lincoln County, OR (3) · latest Nov 10, 2023
- Kittitas County, WA (2) · latest Sep 12, 1978
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.