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Pleurotus ostreatus   (Oyster mushroom)
Europe, North America and Asia
Cap 5-14 cm diameter, stem 2-3 cm tall * 1-1.5 cm thick

Pleurotus ostreatus, also known as the Oyster mushroom, is a medium to large fungus which is named for its shape rater its taste. It is sometimes found in great quantity and may be dried and stored for later use. It is easily cultivated and grown commercially almost all over the world.

Cap Convex with an incurved margin at first, expanding to a fan-shaped with a flat or shallowly depressed disc and inner limb. Gills are crowded, white to cream, and descend on the stalk if present. Stem off-center with a lateral attachment to wood.

Similar species include Omphalotus olivascens, the western jack-o'-lantern mushroom, Clitocybe dealbata, the ivory funnel mushroom, and Pleurocybella porrigens which all can be mistaken for Pleurotus ostreatus. Omphalotus nidiformis is a toxic lookalike found in Australia and Japan.

Pleurotus ostreatus on the web site.

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