Home › Species › Diminutive Agaricus

Diminutive Agaricus

Agaricus diminutivus · Family Agaricaceae · Updated October 2026

323US records

23states

Octbusiest month

323 US records since 1900 (81 in the last 10 years)

Last seen Oct 26, 2024 (about 2 years ago) near Orick, Humboldt County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from New Jersey, California and Pennsylvania, and the busiest months are Oct, Aug 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: Oct, Aug, Jul.

Where it's recorded

State	Records	Latest sighting
New Jersey	192	Nov 3, 2019
California	48	Oct 26, 2024
Pennsylvania	19	2019
Michigan	6	Jun 25, 1968
Florida	6	Jul 29, 1984
Illinois	6	Sep 20, 1989
Washington	6	Oct 10, 2014
New York	5	Jul 10, 1920
Tennessee	5	Oct 12, 2015
North Carolina	5	Aug 6, 1926
Texas	4	Sep 20, 2002
Oregon	4	Nov 22, 2022

Top counties

Sussex County, NJ (36) · latest Sep 28, 2019
Ocean County, NJ (29) · latest Oct 26, 2019
Mercer County, NJ (24) · latest May 4, 2019
Humboldt County, CA (22) · latest Oct 26, 2024
Morris County, NJ (22) · latest Jul 20, 2019
Burlington County, NJ (19) · latest Oct 6, 2018
Mendocino County, CA (15) · latest Nov 21, 2007
Hunterdon County, NJ (15) · latest Aug 25, 2019
Monmouth County, NJ (13) · latest Aug 22, 2015
Middlesex County, NJ (12) · latest Aug 18, 2019

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 Amazon

As an Amazon Associate we earn from qualifying purchases.