Cortinarius pinguis
Family Cortinariaceae · Updated October 2026
97US records
8states
Augbusiest month
97 US records since 1941 (22 in the last 10 years)
Last seen Oct 8, 2025 (about 13 months ago) near Port Angeles, Clallam County, WA, a preserved specimen in INSDC Sequences. Most US records come from Washington, Colorado 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.
☠ Dangerous genus. The genus Cortinarius includes webcaps containing orellanine. Mushrooms in this group have caused serious or fatal poisonings.
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 | 38 | Oct 8, 2025 |
| Colorado | 20 | Aug 28, 2024 |
| Oregon | 14 | Jun 15, 2024 |
| Utah | 12 | Aug 7, 2021 |
| California | 7 | Jul 24, 2025 |
| Idaho | 2 | Sep 5, 2008 |
| North Carolina | 2 | Jul 8, 2021 |
| Wyoming | 2 | Sep 9, 1990 |
Top counties
- Jefferson County, OR (9) · latest Aug 29, 1976
- Summit County, UT (8) · latest Aug 31, 2019
- Clallam County, WA (7) · latest Oct 8, 2025
- King County, WA (5) · latest Jun 27, 2001
- Chelan County, WA (5) · latest Aug 16, 1995
- Pierce County, WA (4) · latest Oct 9, 2014
- Clear Creek County, CO (4) · latest Aug 10, 2019
- Grand County, CO (4) · latest Aug 18, 2021
- Duchesne County, UT (4) · latest Aug 7, 2021
- Skagit County, WA (4) · latest Jun 30, 2018
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.