Nitrous Bonnet
Mycena leptocephala · Family Mycenaceae · Updated October 2026
217US records
28states
Novbusiest month
217 US records since 1899 (120 in the last 10 years)
Last seen Jul 25, 2026 (about 3 months ago) near Oakmont, Allegheny County, PA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Washington and New York, and the busiest months are Nov, Oct 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.
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: Nov, Oct, Jan.
Where it's recorded
Top counties
- Alameda County, CA (15) · latest Dec 4, 2025
- Humboldt County, CA (10) · latest Nov 21, 2023
- Grant County, WA (10) · latest Nov 4, 1982
- Marin County, CA (9) · latest Nov 18, 2025
- Pierce County, WA (8) · latest Apr 20, 1988
- San Francisco County, CA (8) · latest Dec 30, 2023
- Lane County, OR (7) · latest Nov 8, 2023
- Tompkins County, NY (7) · latest Jun 15, 1904
- Santa Cruz County, CA (6) · latest Jan 18, 2026
- Sonoma County, CA (6) · latest Nov 18, 2025
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.