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mushroom poisonings

Three Deadly Mushrooms

Mushrooms can kill. Eat only what you can identify. These are the three most deadly mushrooms in California:

Amanita phalloides | Amanita ocreata | Galerina autumnalis

phalloides
© photo by Debbie Viess

Amanita phalloides

An introduced species, common and spreading, under coast live oak and cultivated cork oak - may be spreading to conifers. Can appear in summer in irrigated areas, fruits into winter. White gills and spores, annulus or skirt present (but can be lost), with a membraneous sac, or volva, at the base of the stem. Cap color variable, from the classic metallic green-yellow, to tan, brown or rarely, white. Most common cause of fatal mushroom poisoning in CA and the U.S.

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Amanita ocreata
© photo by Debbie Viess

Amanita ocreata

Uncommon. Our only native deadly amanita. Occurs in mid-winter through spring, under coast live oak. White gills and spores, annulus or skirt present (but can be lost), with a membraneous sac, or volva, at the base of the stem. White cap can show yellow, tan or light brown coloration, especially in the center. Fruit body can be robust, or delicate. Has caused fatalities in CA.

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Galerina autumnalis
© photo by Nathan Wilson

Galerina autumnalis

Small, delicate, wood-rotting fungus that contains the same deadly toxin as the amanitas above. It has an annulus (which can be lost) and brown spores. Seldom eaten, but has been confused with hallucinogenic mushrooms such as Psilocybes (which have purple-black spores) and may grow in the same habitat.

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