Boletinus grisellus
Family Suillaceae · Updated October 2026
33US records
6states
Octbusiest month
33 US records since 1905 (2 in the last 10 years)
Last seen Nov 3, 2023 (about 3 years ago) in Clearwater County, MN, a preserved specimen in Bell Museum fungi. Most US records come from Minnesota, Michigan and Massachusetts, and the busiest months are Oct, Sep 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, Sep, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Minnesota | 18 | Nov 3, 2023 |
| Michigan | 6 | Oct 21, 1967 |
| Massachusetts | 4 | 1909-10 |
| New York | 2 | Sep 20, 1970 |
| Pennsylvania | 2 | 1905 |
| Wisconsin | 1 | Oct 11, 1975 |
Top counties
- Anoka County, MN (9) · latest Sep 29, 2014
- Clearwater County, MN (6) · latest Nov 3, 2023
- Middlesex County, MA (4) · latest 1909-10
- Oakland County, MI (3) · latest Oct 21, 1967
- Livingston County, MI (3) · latest Oct 15, 1936
- Armstrong County, PA (2) · latest 1905
- Hennepin County, MN (1) · latest Oct 1, 1972
- Cass County, MN (1) · latest Sep 24, 1988
- Becker County, MN (1) · latest Sep 23, 1980
- Albany County, NY (1) · latest Oct 19, 1968
More on this species from GBIF.
Bring along
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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.