Cystoderma fallax
Family Agaricaceae · Updated October 2026
226US records
16states
Sepbusiest month
226 US records since 1934 (34 in the last 10 years)
Last seen Dec 20, 2024 (about 22 months ago) near Meadow Vista, Placer County, CA, a preserved specimen in INSDC Sequences. Most US records come from California, Washington and Alaska, and the busiest months are Sep, Oct and Aug. (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: Sep, Oct, Aug.
Where it's recorded
Top counties
- Mendocino County, CA (14) · latest Dec 17, 2024
- North Slope Borough, AK (11) · latest Aug 8, 2006
- Denali Borough, AK (9) · latest Aug 11, 1998
- Thurston County, WA (9) · latest Oct 25, 1971
- Yuba County, CA (8) · latest Nov 25, 2023
- San Juan County, WA (8) · latest Nov 27, 1980
- Tuolumne County, CA (7) · latest Dec 13, 1984
- Boulder County, CO (7) · latest Sep 4, 2007
- Fairbanks North Star Borough, AK (7) · latest 2010-08
- Humboldt County, CA (6) · latest Nov 20, 2021
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.