Ponderous Cort
Phlegmacium ponderosum · Family Cortinariaceae · Updated October 2026
31US records
3states
Decbusiest month
31 US records since 1974 (18 in the last 10 years)
Last seen Jan 14, 2026 (about 9 months ago) near Timber Cove, Sonoma County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Oregon and Washington, and the busiest months are Dec, Nov and Jan. (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: Dec, Nov, Jan.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 25 | Jan 14, 2026 |
| Oregon | 5 | Nov 18, 2021 |
| Washington | 1 | Oct 24, 2004 |
Top counties
- Yuba County, CA (7) · latest Dec 13, 2024
- Santa Cruz County, CA (5) · latest Dec 11, 2024
- Sonoma County, CA (4) · latest Jan 14, 2026
- Lane County, OR (3) · latest Nov 18, 2021
- Santa Clara County, CA (2) · latest Apr 7, 2014
- Josephine County, OR (2) · latest Nov 8, 2013
- Shasta County, CA (2) · latest Dec 8, 2025
- Humboldt County, CA (2) · latest Dec 7, 2021
- Mendocino County, CA (2) · latest Nov 13, 2022
- Del Norte County, CA (1) · latest Nov 7, 2011
More on this species from GBIF.
Bring along
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Folding mushroom knife with brushSee on Amazon🍄
Wicker foraging basketSee on Amazon🍄
10x hand lens / loupeSee on Amazon🍄
Spore print paperSee on AmazonAs an Amazon Associate we earn from qualifying purchases.