Mountain Webcap
Cortinarius alpinus · Family Cortinariaceae · Updated October 2026
33US records
5states
Augbusiest month
33 US records since 1982 (1 in the last 10 years)
Last seen Aug 14, 2019 (about 7 years ago) near Telluride, San Miguel County, CO, a preserved specimen in Denver Botanic Gardens, Sam Mitchel Herbarium of Fungi. Most US records come from Alaska, Wyoming and Colorado, and the busiest months are Aug and Jul. (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.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Alaska | 24 | Aug 7, 2006 |
| Wyoming | 5 | Aug 28, 1995 |
| Colorado | 2 | Aug 14, 2019 |
| Arizona | 1 | – |
| New Mexico | 1 | – |
Top counties
- North Slope Borough, AK (15) · latest Aug 7, 2006
- Teton County, WY (5) · latest Aug 28, 1995
- Denali Borough, AK (4) · latest Jul 20, 1995
- Yukon-Koyukuk Census Area, AK (3) · latest Jul 30, 2006
- Nome Census Area, AK (2) · latest Aug 21, 2001
- Pima County, AZ (1)
- Santa Fe County, NM (1)
- Pitkin County, CO (1) · latest Aug 4, 2000
- San Miguel County, CO (1) · latest Aug 14, 2019
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.