Blackening Slime Spike
Gomphidius oregonensis · Family Gomphidiaceae · Updated October 2026
228US records
7states
Novbusiest month
228 US records since 1901 (101 in the last 10 years)
Last seen Dec 13, 2025 (about 10 months ago) in Memorial Park, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Washington and Oregon, and the busiest months are Nov, Oct 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: Nov, Oct, Dec.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 147 | Dec 13, 2025 |
| Washington | 51 | Nov 18, 2025 |
| Oregon | 22 | Oct 24, 2025 |
| Idaho | 5 | Nov 11, 1972 |
| Montana | 1 | Oct 1, 1978 |
| New Mexico | 1 | Aug 6, 1992 |
| Alaska | 1 | Aug 12, 2004 |
Top counties
- Marin County, CA (33) · latest Dec 11, 2025
- San Mateo County, CA (26) · latest Dec 13, 2025
- Santa Cruz County, CA (21) · latest Dec 11, 2025
- Mendocino County, CA (18) · latest Nov 28, 2024
- Pierce County, WA (14) · latest Oct 9, 2014
- Sonoma County, CA (12) · latest Dec 28, 2024
- Humboldt County, CA (11) · latest Oct 12, 2023
- King County, WA (9) · latest Dec 30, 2018
- Santa Clara County, CA (7) · latest Nov 18, 2025
- Lane County, OR (7) · latest Oct 24, 2025
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.