Cortinarius griseoluridus
Family Cortinariaceae · Updated October 2026
33US records
6states
Augbusiest month
33 US records since 1950 (0 in the last 10 years)
Last seen Aug 12, 2010 (about 16 years ago) near Winter Park, Grand County, CO, a preserved specimen in Field Museum of Natural History (Botany) Fungi Collection. Most US records come from Colorado, Wyoming and Oregon, and the busiest months are Aug, Jul 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: Aug, Jul, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Colorado | 17 | Aug 12, 2010 |
| Wyoming | 7 | Aug 11, 1999 |
| Oregon | 4 | Nov 29, 1991 |
| Idaho | 2 | Aug 31, 1964 |
| California | 2 | Nov 30, 1984 |
| Tennessee | 1 | Oct 24, 1975 |
Top counties
- Pitkin County, CO (7) · latest Aug 10, 1979
- Fremont County, WY (4) · latest Aug 11, 1999
- Coos County, OR (4) · latest Nov 29, 1991
- Grand County, CO (3) · latest Aug 12, 2010
- Valley County, ID (2) · latest Aug 31, 1964
- Teton County, WY (2) · latest Aug 10, 1999
- Summit County, CO (2) · latest Aug 16, 1997
- Carbon County, WY (1) · latest Aug 15, 1950
- Eagle County, CO (1) · latest Aug 1, 1978
- Humboldt County, CA (1)
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.