Cortinarius ahsii
Family Cortinariaceae · Updated October 2026
39US records
7states
Julbusiest month
39 US records since 1978 (6 in the last 10 years)
Last seen Mar 28, 2026 (about 7 months ago) near Brinnon, Jefferson County, WA, a preserved specimen in INSDC Sequences. Most US records come from Washington, Colorado and California, and the busiest months are Jul, Jun and May. (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: Jul, Jun, May.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 15 | Mar 28, 2026 |
| Colorado | 10 | Jun 23, 2003 |
| California | 4 | Jul 9, 2023 |
| Wyoming | 4 | Aug 11, 1999 |
| Idaho | 3 | Jun 12, 1986 |
| Utah | 2 | Jul 3, 1993 |
| Oregon | 1 | Jun 25, 2010 |
Top counties
- Gilpin County, CO (5) · latest Jun 23, 2003
- Clallam County, WA (5) · latest Apr 21, 1999
- Pitkin County, CO (3) · latest Jul 29, 1979
- Pend Oreille County, WA (3) · latest May 28, 2012
- Modoc County, CA (2) · latest Jul 9, 2023
- Skamania County, WA (2) · latest Jul 11, 2010
- Valley County, ID (2) · latest Jun 12, 1986
- Cache County, UT (2) · latest Jul 3, 1993
- Fremont County, WY (2) · latest Aug 11, 1999
- Siskiyou County, CA (1) · latest May 10, 2012
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.