Catathelasma ventricosum
Family Biannulariaceae · Updated October 2026
106US records
18states
Novbusiest month
106 US records since 1896 (31 in the last 10 years)
Last seen Nov 1, 2025 (about 12 months ago) near Big Lagoon, Humboldt County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California, Oregon and Colorado, and the busiest months are Nov, 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: Nov, Oct, Aug.
Where it's recorded
Top counties
- Humboldt County, CA (27) · latest Nov 1, 2025
- District of Columbia, DC (5) · latest Dec 2, 1910
- Blount County, TN (4) · latest Nov 23, 1962
- Adams County, ID (4) · latest Sep 4, 2008
- Coos County, OR (4) · latest Sep 23, 1993
- Del Norte County, CA (3) · latest Oct 23, 1982
- Clear Creek County, CO (3) · latest Aug 11, 2006
- Lee County, AL (3) · latest 1897-11
- Anderson County, TN (3) · latest Dec 3, 1949
- Clallam County, WA (3) · latest Sep 19, 2000
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.