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Atkinson's Fungus

Cortinarius atkinsonianus · Family Cortinariaceae · Updated October 2026

230US records

11states

Octbusiest month

230 US records since 1905 (74 in the last 10 years)

Last seen Oct 4, 2026 (about 3 weeks ago) near Lakeville, Scott County, MN, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from New Jersey, Pennsylvania and Minnesota, 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.

☠ Dangerous genus. The genus Cortinarius includes webcaps containing orellanine. Mushrooms in this group have caused serious or fatal poisonings.

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	191	Nov 3, 2019
Pennsylvania	20	Sep 24, 2022
Minnesota	7	Oct 4, 2026
Michigan	2	Sep 11, 1940
Ohio	2	Oct 19, 2016
Illinois	2	Sep 30, 2023
Indiana	2	Oct 20, 2021
Oregon	1	Dec 3, 1915
Arkansas	1	Oct 25, 2013
Kentucky	1	Aug 22, 1909
New York	1	Sep 15, 1905

Top counties

Sussex County, NJ (36) · latest Sep 28, 2019
Ocean County, NJ (29) · latest Oct 26, 2019
Mercer County, NJ (23) · latest May 4, 2019
Morris County, NJ (22) · latest Jul 20, 2019
Burlington County, NJ (19) · latest Oct 6, 2018
Hunterdon County, NJ (15) · latest Aug 25, 2019
Monmouth County, NJ (13) · latest Aug 22, 2015
Middlesex County, NJ (12) · latest Aug 18, 2019
Bucks County, PA (11) · latest 2019
Warren County, NJ (11) · latest Jul 28, 2019

Bring along

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Folding mushroom knife with brushSee on Amazon

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Wicker foraging basketSee on Amazon

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10x hand lens / loupeSee on Amazon

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Spore print paperSee on Amazon

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