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Slimy Webcap

Cortinarius mucifluus · Family Cortinariaceae · Updated October 2026

273US records

13states

Octbusiest month

273 US records since 1905 (67 in the last 10 years)

Last seen Nov 3, 2019 (about 7 years ago) near Belleplain, Cape May County, NJ, a field observation from Fungi of parks, forests and reserves of New Jersey (2007-2019). Most US records come from New Jersey, Washington 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.

☠ 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
Washington	29	Oct 25, 2000
Pennsylvania	22	2019
Oregon	13	Oct 29, 1995
Colorado	6	Oct 1, 1995
Michigan	3	Oct 17, 1961
California	3	Nov 24, 1962
Wisconsin	1	Sep 19, 1905
Maine	1	Aug 18, 1979
Massachusetts	1	Oct 4, 1911
North Carolina	1	Sep 12, 1945
New York	1	Oct 4, 1909

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

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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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