Mustard Honey Fungus
Armillaria sinapina · Family Physalacriaceae · Updated October 2026
111US records
16states
Decbusiest month
111 US records since 1989 (94 in the last 10 years)
Last seen Feb 5, 2026 (about 9 months ago) near Scotts Valley, Santa Cruz County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Alaska and Washington, and the busiest months are Dec, Nov and Oct. (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, Oct.
Where it's recorded
Top counties
- Marin County, CA (21) · latest Dec 11, 2025
- San Mateo County, CA (14) · latest Dec 20, 2025
- Santa Cruz County, CA (13) · latest Feb 5, 2026
- Sonoma County, CA (9) · latest Nov 29, 2025
- Mendocino County, CA (7) · latest Dec 19, 2024
- Humboldt County, CA (5) · latest Nov 24, 2024
- Kenai Peninsula Borough, AK (4) · latest Sep 28, 2014
- Alameda County, CA (4) · latest Dec 15, 2025
- Fairfax County, VA (3) · latest Nov 26, 2019
- Contra Costa County, CA (3) · latest Jan 9, 2021
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.