Agaricus smithianus
Family Agaricaceae · Updated October 2026
42US records
4states
Novbusiest month
42 US records since 1934 (18 in the last 10 years)
Last seen Nov 22, 2024 (about 23 months ago) near Big Lagoon, Humboldt County, CA, a preserved specimen in INSDC Sequences. Most US records come from California, Washington and Oregon, and the busiest months are Nov, Oct 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.
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, Jul.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 37 | Nov 22, 2024 |
| Washington | 2 | Aug 26, 1935 |
| Oregon | 2 | Nov 2, 1989 |
| Utah | 1 | Sep 6, 1997 |
Top counties
- Humboldt County, CA (32) · latest Nov 22, 2024
- Mendocino County, CA (3) · latest Oct 27, 1981
- Coos County, OR (2) · latest Nov 2, 1989
- Del Norte County, CA (1) · latest Oct 27, 1967
- Alameda County, CA (1) · latest Oct 17, 1972
- Duchesne County, UT (1) · latest Sep 6, 1997
- Kitsap County, WA (1) · latest Aug 26, 1935
- King County, WA (1) · latest 1934-09
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.