Cortinarius clandestinus
Family Cortinariaceae · Updated October 2026
103US records
8states
Octbusiest month
103 US records since 1947 (17 in the last 10 years)
Last seen May 23, 2026 (about 5 months ago) in Siskiyou County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from Washington, California and Colorado, and the busiest months are Oct, May 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.
☠ 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: Oct, May, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 64 | Nov 16, 2025 |
| California | 18 | May 23, 2026 |
| Colorado | 8 | Aug 13, 2015 |
| Oregon | 7 | May 29, 2015 |
| Idaho | 2 | Sep 5, 2008 |
| Kansas | 2 | – |
| Arizona | 1 | Aug 20, 2025 |
| Montana | 1 | 1984-05 |
Top counties
- Clallam County, WA (23) · latest Nov 19, 2000
- Pierce County, WA (8) · latest Nov 16, 2025
- Skagit County, WA (7) · latest Jun 30, 2018
- Siskiyou County, CA (5) · latest May 23, 2026
- Kittitas County, WA (4) · latest 2016-05
- Sierra County, CA (3) · latest Jun 9, 2023
- Chelan County, WA (3) · latest Jun 27, 1991
- Snohomish County, WA (3) · latest Oct 16, 2010
- Mono County, CA (2) · latest Jul 1, 2024
- Grays Harbor County, WA (2) · latest Jul 6, 2024
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.