Cultivated Mushroom

Agaricus bisporus


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By Roger Phillips

Published 2006

Cultivated Mushroom Agaricus bisporus (J.E. Lange) Imbach (illustrated 50% life size) Cap 5–10cm across, hemispherical expanding convex; greyish-brown to umber, covered in brown radiating fibres; often slightly scaly with age. Stem 35–55Γ—8–14mm; white; often flaky below the membranous, sheathing ring. Flesh white, bruising faintly red; taste and smell mushroomy. Gills free; dirty pinkish, darkening with age. Spores 4–7.5Γ—4–5.5ΒΌ, ovate to subglobose. Spore print brown. Basidia 2-spored, separating this species from the rest of the genus, which all have 4-spored basidia. Cheilocystidia 17–44Γ—7–14ΒΌ, elongate-clavate, thin-walled. Habitat on manure heaps, garden waste, and roadsides, not in grass; late spring to autumn. Occasional. Edible. Note this species is believed to be the wild form of many of the cultivated crop varieties, all of which have 2-spored basidia.

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