Any fungus of the family Agaricaceae, including the familiar commercially grown mushroom .
Agarics have spore -bearing cells (basidia) located on thin sheets called gills. Best known of the agarics is the genus Agaricus ( Psalliota ), which includes some 60 species, the most prominent being the edible meadow, or field, mushroom, A. campestris , and the common cultivated mushroom, A. bisporus.