Basidium is a cell on which the spores of the mushroom are produced. It is a microscopic club shaped cell. Usually there are four basidiospores attached to a basidum, however in some species such as Agaricus bisporus there are two.
A basidium (pl., basidia) is a microscopic, spore-producing structure found on the hymenophore of fruiting bodies of basidiomycete fungi.
In a typical basidium, each basidiospore is borne at the tip of a narrow prong or horn called a sterigma (pl. sterigmata), and is forcibly discharged upon maturity.
Sometimes the basidium (metabasidium) develops from a probasidium, which is a specialized cell which is not elongated like a typical hypha.
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