Dark Bitter Bolete
Caloboletus conifericola · Family Boletaceae · Updated October 2026
51US records
5states
Augbusiest month
51 US records since 1970 (30 in the last 10 years)
Last seen Aug 12, 2026 (about 2 months ago) near Glacier, Whatcom County, WA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from Washington, Alaska and Oregon, and the busiest months are Aug, Sep and Oct. (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: Aug, Sep, Oct.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 25 | Aug 12, 2026 |
| Alaska | 12 | Aug 14, 2025 |
| Oregon | 7 | Jul 3, 2023 |
| Idaho | 4 | Sep 23, 1983 |
| California | 3 | Oct 22, 2022 |
Top counties
- Anchorage Municipality, AK (10) · latest Aug 14, 2025
- Lane County, OR (5) · latest Sep 12, 2021
- Skamania County, WA (5) · latest Aug 23, 2025
- King County, WA (4) · latest Aug 10, 2024
- Snohomish County, WA (3) · latest Sep 26, 2024
- Bonner County, ID (3) · latest Sep 23, 1983
- Clallam County, WA (3) · latest Sep 4, 2024
- Whatcom County, WA (3) · latest Aug 12, 2026
- Humboldt County, CA (3) · latest Oct 22, 2022
- Pierce County, WA (2) · latest Oct 9, 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.