Agaricus bisporus is a saprotrophic basidiomycete distinguished microscopically by having predominantly two-spored basidia, a feature that separates it from most other members of the genus Agaricus which are typically four-spored. This species exhibits significant morphological plasticity depending on maturity; it is harvested commercially at three distinct stages: 'white button' (immature, white strain), 'cremini' or 'baby bella' (immature, brown strain), and 'portobello' (fully mature, brown strain with expanded cap). The lifecycle is characterized by secondary homothallism (pseudohomothallism), where two non-sister nuclei are packaged into a single spore, allowing for self-fertility, though heterothallic varieties like var. burnettii exist in wild populations.
Native: Europe (grasslands), North America (coastal California var. burnettii, montane regions). Introduced: Worldwide (cultivated globally), Australia, New Zealand, South America. Ubiquitous in cultivation; wild populations are widespread in the Northern Hemisphere but less common than the cultivated form.
No strains cataloged yet for this species.
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