Onnia subtriquetra
Family Hymenochaetaceae · Updated October 2026
43US records
12states
Janbusiest month
43 US records since 1933 (33 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, Montana and Virginia, and the busiest months are Jan, Oct 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, Oct, Nov.
Where it's recorded
Top counties
- Mineral County, MT (4) · latest 2023
- Mendocino County, CA (4) · latest 2024
- Humboldt County, CA (3) · latest Oct 3, 2025
- Lancaster County, SC (2) · latest 1965
- Fairfax County, VA (2) · latest 1933
- Dickinson County, MI (2) · latest 1990
- Prince George County, VA (2) · latest 1965
- Santa Barbara County, CA (2) · latest Jan 29, 2020
- Mason County, WA (2) · latest Nov 15, 2020
- Tulare County, CA (2) · latest Aug 29, 2024
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.