Rootlet Brittlestem
Psathyrella microrhiza · Family Psathyrellaceae · Updated October 2026
31US records
7states
Octbusiest month
31 US records since 1952 (29 in the last 10 years)
Last seen Dec 23, 2025 (about 10 months ago) near Florence, Lane County, OR, a preserved specimen in INSDC Sequences. Most US records come from Oregon, Washington and California, and the busiest months are Oct, Nov and Dec. (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, Nov, Dec.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Oregon | 16 | Dec 23, 2025 |
| Washington | 10 | Oct 30, 2025 |
| California | 1 | Jan 22, 2023 |
| Kansas | 1 | Oct 13, 1970 |
| Indiana | 1 | Oct 17, 2022 |
| New York | 1 | Nov 16, 2023 |
| Ohio | 1 | Oct 19, 2023 |
Top counties
- Lane County, OR (15) · latest Dec 23, 2025
- Clallam County, WA (7) · latest Oct 17, 2025
- King County, WA (3) · latest Oct 30, 2025
- Sonoma County, CA (1) · latest Jan 22, 2023
- Josephine County, OR (1) · latest Dec 9, 2021
- Miami County, KS (1) · latest Oct 13, 1970
- Brown County, IN (1) · latest Oct 17, 2022
- Kings County, NY (1) · latest Nov 16, 2023
- Portage County, OH (1) · latest Oct 19, 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.