Gerronema atrialbum
Family Marasmiaceae · Updated October 2026
36US records
5states
Octbusiest month
36 US records since 1911 (18 in the last 10 years)
Last seen Oct 21, 2025 (about 12 months ago) near Sudden Valley, Whatcom County, 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 Oct, Jan and Dec. (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: Oct, Jan, Dec.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 22 | Oct 21, 2025 |
| California | 10 | Jan 5, 2025 |
| Oregon | 2 | Oct 17, 2020 |
| Michigan | 1 | Oct 7, 1994 |
| Virginia | 1 | Sep 26, 1991 |
Top counties
- Whatcom County, WA (8) · latest Oct 21, 2025
- King County, WA (6) · latest Oct 9, 2005
- Kitsap County, WA (3) · latest Sep 28, 1932
- Marin County, CA (2) · latest Dec 16, 2023
- Fresno County, CA (2) · latest Jan 5, 2025
- Riverside County, CA (1) · latest Jan 23, 1982
- San Mateo County, CA (1) · latest Jan 15, 1983
- Sonoma County, CA (1) · latest Jan 3, 2025
- Yuba County, CA (1) · latest Dec 11, 2021
- Marion County, OR (1) · latest Oct 12, 2018
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.