Small Agaric
Agaricus micromegethus · Family Agaricaceae · Updated October 2026
35US records
11states
Octbusiest month
35 US records since 1906 (1 in the last 10 years)
Last seen Feb 2, 2024 (about 3 years ago) near Cayucos, San Luis Obispo County, CA, a preserved specimen in International Barcode of Life project (iBOL). Most US records come from California, Washington and New York, and the busiest months are Oct, Dec and Sep. (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, Dec, Sep.
Where it's recorded
Top counties
- King County, WA (7) · latest Oct 5, 1973
- San Francisco County, CA (3) · latest Dec 3, 1978
- Los Angeles County, CA (3) · latest Oct 19, 1916
- Marin County, CA (2) · latest Dec 5, 1979
- Bronx County, NY (2) · latest Oct 2, 1983
- Cook County, IL (2) · latest Sep 22, 1998
- San Mateo County, CA (1) · latest Oct 20, 2012
- Norfolk County, MA (1) · latest 1906-10
- Carter County, TN (1)
- Riley County, KS (1) · latest Jun 25, 1951
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.