Royal Bolete
Butyriboletus regius · Family Boletaceae · Updated October 2026
58US records
7states
Novbusiest month
58 US records since 1898 (0 in the last 10 years)
Last seen Oct 1, 2011 (about 15 years ago) in Tahoe National Forest, CA, a preserved specimen in San Francisco State University, Harry D. Thiers Herbarium. Most US records come from California, Oregon and Massachusetts, and the busiest months are Nov, Oct and Dec. (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: Nov, Oct, Dec.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 50 | Oct 1, 2011 |
| Oregon | 2 | Nov 5, 1990 |
| Massachusetts | 2 | Sep 11, 1898 |
| Florida | 1 | Jul 20, 1958 |
| Texas | 1 | Aug 12, 1982 |
| North Carolina | 1 | Sep 9, 1934 |
| Pennsylvania | 1 | – |
Top counties
- Mendocino County, CA (14) · latest Oct 15, 1989
- Sierra County, CA (11) · latest Oct 1, 2011
- San Mateo County, CA (7) · latest Dec 14, 1996
- Marin County, CA (3) · latest Dec 13, 1996
- Tuolumne County, CA (3) · latest Jun 8, 1973
- Nevada County, CA (2) · latest Nov 9, 1975
- Santa Cruz County, CA (2) · latest Jan 18, 1967
- Sonoma County, CA (1) · latest Nov 24, 1979
- Mariposa County, CA (1) · latest Sep 30, 1975
- El Dorado County, CA (1) · latest Jun 26, 1982
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.