Inocybe olympiana
Family Inocybaceae · Updated October 2026
44US records
5states
Octbusiest month
44 US records since 1935 (6 in the last 10 years)
Last seen Jan 21, 2026 (about 9 months ago) near Lagunitas-Forest Knolls, Marin County, CA, a preserved specimen in INSDC Sequences. Most US records come from Washington, California and Oregon, and the busiest months are Oct, 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.
☠ Dangerous genus. The genus Inocybe includes fibercaps containing muscarine. 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, Nov, Jan.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 29 | Oct 17, 2013 |
| California | 9 | Jan 21, 2026 |
| Oregon | 4 | Aug 5, 2016 |
| Kansas | 1 | Oct 17, 1935 |
| Idaho | 1 | 1970-09 |
Top counties
- Pierce County, WA (9) · latest Nov 11, 1993
- Jefferson County, WA (6) · latest 2008-10
- Snohomish County, WA (4) · latest Oct 30, 1976
- Marin County, CA (3) · latest Jan 21, 2026
- Mendocino County, CA (3) · latest Nov 25, 2023
- Tillamook County, OR (3) · latest Oct 3, 2006
- King County, WA (3) · latest Oct 24, 1971
- Clallam County, WA (2) · latest Oct 5, 2001
- Lewis County, WA (2) · latest Oct 2, 1972
- Sierra County, CA (1) · latest Oct 13, 1984
More on this species from GBIF.
Bring along
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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.