Hair Ice Crust
Exidiopsis effusa · Family Auriculariaceae · Updated October 2026
96US records
7states
Janbusiest month
96 US records since 1958 (87 in the last 10 years)
Last seen Mar 1, 2026 (about 8 months ago) in Centennial Trail, WA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from Washington, California and Oregon, and the busiest months are Jan, Dec 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.
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: Jan, Dec, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 77 | Mar 1, 2026 |
| California | 8 | Nov 23, 1971 |
| Oregon | 6 | Dec 31, 2025 |
| New Mexico | 2 | Oct 28, 2022 |
| Rhode Island | 1 | Nov 23, 2025 |
| Alaska | 1 | Dec 7, 2023 |
| Pennsylvania | 1 | Nov 18, 2025 |
Top counties
- King County, WA (42) · latest Jan 24, 2026
- Thurston County, WA (7) · latest Feb 11, 2025
- Snohomish County, WA (6) · latest Mar 1, 2026
- Whatcom County, WA (6) · latest Feb 15, 2026
- Pierce County, WA (5) · latest Dec 16, 2023
- El Dorado County, CA (3) · latest Nov 21, 1958
- Clallam County, WA (3) · latest Nov 18, 2023
- Skagit County, WA (3) · latest Dec 20, 2021
- Columbia County, OR (3) · latest Dec 31, 2025
- Amador County, CA (2) · latest Nov 8, 1960
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.