Pleated Marasmius
Marasmius plicatulus · Family Marasmiaceae · Updated October 2026
461US records
5states
Janbusiest month
461 US records since 1907 (325 in the last 10 years)
Last seen Feb 4, 2026 (about 9 months ago) in Ignacio Valley Open Space Preserve, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Washington and Oregon, and the busiest months are Jan, Dec 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: Jan, Dec, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| California | 375 | Feb 4, 2026 |
| Washington | 43 | Jan 1, 2026 |
| Oregon | 37 | Nov 8, 2025 |
| Alaska | 5 | Sep 17, 2022 |
| Alabama | 1 | Aug 15, 2018 |
Top counties
- Marin County, CA (59) · latest Feb 4, 2026
- Sonoma County, CA (47) · latest Jan 2, 2026
- Humboldt County, CA (40) · latest Nov 18, 2025
- San Mateo County, CA (36) · latest Dec 31, 2025
- Mendocino County, CA (26) · latest Nov 8, 2025
- Los Angeles County, CA (23) · latest Jan 9, 2026
- Santa Clara County, CA (21) · latest Jan 17, 2026
- Santa Cruz County, CA (20) · latest Nov 23, 2025
- Contra Costa County, CA (18) · latest Jan 17, 2026
- Santa Barbara County, CA (17) · latest Jan 5, 2023
More on this species from GBIF.
Bring along
🍄
Regional mushroom field guideSee on Amazon🍄
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.