Swamp Slippery Jack
Boletus paluster · Family Boletaceae · Updated October 2026
39US records
8states
Octbusiest month
39 US records since 1887 (8 in the last 10 years)
Last seen Oct 23, 2025 (about 12 months ago) near Tremont, Hancock County, ME, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from New York, Minnesota and Maine, and the busiest months are Oct, Sep and Aug. (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, Aug.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| New York | 20 | Oct 5, 2016 |
| Minnesota | 6 | Oct 10, 2024 |
| Maine | 5 | Oct 23, 2025 |
| Massachusetts | 4 | Oct 4, 1970 |
| Idaho | 1 | Jul 15, 1964 |
| Pennsylvania | 1 | Aug 9, 1941 |
| Wisconsin | 1 | Aug 31, 1906 |
| Vermont | 1 | Sep 25, 2021 |
Top counties
- Franklin County, NY (8) · latest Oct 5, 2016
- Penobscot County, ME (4) · latest 1887-09
- Middlesex County, MA (4) · latest Oct 4, 1970
- Essex County, NY (3) · latest Sep 12, 1982
- Isanti County, MN (2) · latest Oct 2, 1989
- Chenango County, NY (2) · latest Aug 10, 1960
- Rensselaer County, NY (2) · latest 1910-08
- Lewis County, NY (2)
- Lake County, MN (2) · latest Oct 5, 2023
- Beltrami County, MN (1) · latest Sep 23, 2014
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.