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Girdled Webcap

Cortinarius trivialis · Family Cortinariaceae · Updated October 2026

71US records

12states

Augbusiest month

71 US records since 1909 (7 in the last 10 years)

Last seen Aug 25, 2025 (about 14 months ago) near Greer, Apache County, AZ, a preserved specimen in INSDC Sequences. Most US records come from Colorado, California and Washington, and the busiest months are Aug, Sep and Oct. (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: Aug, Sep, Oct.

Where it's recorded

State	Records	Latest sighting
Colorado	15	Aug 5, 2023
California	12	Dec 4, 2014
Washington	10	Aug 28, 2010
Michigan	9	Sep 16, 1978
Minnesota	6	Sep 14, 2013
Alaska	6	Aug 28, 2021
Wyoming	5	Aug 12, 1997
New Mexico	2	Aug 10, 2015
Arizona	2	Aug 25, 2025
Vermont	2	Sep 29, 2022
Maine	1	Aug 8, 1962
Wisconsin	1	Sep 8, 2017

Top counties

Boulder County, CO (6) · latest Aug 23, 2010
Teton County, WY (4) · latest Aug 12, 1997
El Dorado County, CA (4) · latest Sep 16, 1983
Clear Creek County, CO (4) · latest Aug 27, 2011
Kittitas County, WA (4) · latest Oct 14, 2000
Mendocino County, CA (3) · latest Oct 26, 1986
Montmorency County, MI (3) · latest Aug 9, 1967
Chippewa County, MI (3) · latest Aug 25, 1955
Sierra County, CA (2) · latest Sep 20, 1975
Apache County, AZ (2) · latest Aug 25, 2025

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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