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California Jack O' Lantern

California Jack O' Lantern (Omphalotus olivascens), photo
Photo: no rights reserved, CC0 · iNaturalist
Omphalotus olivascens · Family Omphalotaceae · Updated October 2026
1,399US records
2states
Janbusiest month
1,399 US records since 1920 (1,304 in the last 10 years)

Last seen Jun 18, 2026 (about 4 months ago) near Woodside, San Mateo County, CA, photographed by an iNaturalist user, with the ID agreed on by other iNaturalist users (research grade). Most US records come from California and Kansas, and the busiest months are Jan, Dec and Feb. (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.
☠ Dangerous genus. The genus Omphalotus includes jack-o'-lantern mushrooms, often mistaken for chanterelles. Mushrooms in this group have caused serious or fatal poisonings.
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

Jan531Feb190Mar97Apr28May13Jun4Jul1Aug1Sep2Oct11Nov146Dec370

Records by month, all years. Busiest: Jan, Dec, Feb.

Where it's recorded

StateRecordsLatest sighting
California1,396Jun 18, 2026
Kansas3–

Top counties

More on this species from GBIF.

Bring along

🍄
Regional mushroom field guideSee on Amazon
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Folding mushroom knife with brushSee on Amazon
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Wicker foraging basketSee on Amazon
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10x hand lens / loupeSee on Amazon
🍄
Spore print paperSee on Amazon

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