Basidiomycetes, subclass Hollobasidiomycetidae,
order Agricales and family pleurotaceae (Alexopolous
et al, 1996). Like any other mushrooms,they could be
found in the wild or cultivated artificially by
mushroom farms. P ostreatus is cultivated in both
tropical , subtropical and temperate regions of the
world. This mushroom has ability to grow on varieties