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Splitpea Shanklet

Collybia cookei · Family Tricholomataceae · Updated October 2026

362US records

27states

Octbusiest month

362 US records since 1936 (103 in the last 10 years)

Last seen Aug 8, 2025 (about 15 months ago) near Cordry Sweetwater Lakes, Brown County, IN, 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 Colorado, and the busiest months are Oct, Aug 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, Aug, Sep.

Where it's recorded

State	Records	Latest sighting
New Jersey	191	Nov 3, 2019
Pennsylvania	27	Oct 18, 2023
Colorado	22	Aug 22, 2021
Minnesota	19	Sep 21, 2022
Washington	19	Oct 11, 2014
California	13	Nov 26, 2016
North Carolina	11	Sep 26, 2015
New York	8	Oct 21, 2023
Indiana	7	Aug 8, 2025
Michigan	5	Oct 11, 1969
Idaho	5	Sep 28, 1992
West Virginia	5	Oct 20, 2002

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
Warren County, NJ (11) · latest Jul 28, 2019
Bucks County, PA (11) · latest 2019

Bring along

🍄

Regional mushroom field guideSee on Amazon

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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

🍄

Spore print paperSee on Amazon

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