Amanita caesarea, Caesar's mushroom, is a European and North African Amanita with a smooth orange to red cap, a striate margin, yellowish gills, a cap-coloured to paler stem and a large white cup-like volva. It is ectomycorrhizal, mainly with oaks and pines in warm woodland, and is a highly prized edible, known in Italy as ovolo. It is legally protected in several European countries.
Choice edible when correctly identified, but the risk of error is serious. The fly agaric (A. muscaria) has a red cap with white warts that can wash off, but white gills and stem; the death cap and destroying angels are also confused with it. Check for yellow gills and a large white cup-like volva, and get expert confirmation. Italian samples have exceeded EU cadmium and lead limits for cultivated mushrooms.
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Mycology is an evolving science: names, classifications and safety information change as research advances. Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.
Habitat
Ectomycorrhizal, mainly with oaks and pines; in warmer climates in higher oak woodland, sometimes mixed with conifers. Grows singly or in groups. Season: Early summer to mid-autumn.
Distribution
Southern Europe (especially the hills of northern Italy), the Balkans and Hungary, and North Africa; possibly Iran. North American 'Caesar's mushroom' records refer to other species, including A. jacksonii, A. arkansana and A. angelica in the east and A. calyptroderma in the west; Mexican and Asian look-alikes (e.g., A. basii, A. yema, A. hemibapha) are also distinct.
Characteristics
Cap: Up to 20 cm; hemispherical, then convex, then flat; orange to red; smooth, with a striate margin. Gills: Yellowish, close, free or adnexed. Stem: 5–15 cm tall, 1.5–3 cm thick; coloured like the cap or slightly paler; base equal or swollen, seated in the volva. Ring: Hanging loosely, often striate. Volva: White, cup-like, large. Spore print: White to faintly yellow.
