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Elm Leech

Hypsizygus ulmarius · Family Lyophyllaceae · Updated October 2026

486US records

33states

Octbusiest month

486 US records since 1879 (161 in the last 10 years)

Last seen Oct 4, 2026 (about 3 weeks ago) in Battle Creek Regional Park, 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 New York, and the busiest months are Oct, Sep and Nov. (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, Sep, Nov.

Where it's recorded

State	Records	Latest sighting
New Jersey	197	Nov 3, 2019
Pennsylvania	52	Nov 3, 2022
New York	39	Nov 14, 2021
Minnesota	33	Oct 4, 2026
Illinois	23	Sep 19, 2025
Wisconsin	16	Oct 22, 2023
Vermont	15	Dec 2, 2023
Michigan	13	Oct 11, 2025
Virginia	11	Oct 10, 1989
Kansas	10	Apr 9, 2022
Massachusetts	9	Oct 5, 1969
Connecticut	8	Nov 4, 1933

Top counties

Sussex County, NJ (36) · latest Sep 28, 2019
Ocean County, NJ (29) · latest Oct 26, 2019
Mercer County, NJ (25) · latest Sep 21, 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
Hennepin County, MN (12) · latest Sep 30, 2026
Middlesex County, NJ (12) · latest Aug 18, 2019
Champaign County, IL (11) · latest Oct 27, 1959

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

🍄

10x hand lens / loupeSee on Amazon

🍄

Spore print paperSee on Amazon

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