The fruiting bodies of fungi of the class Basidiomycetes are called basidiocarps. Agaricus is a fungus of the class Basidiomycetes. Hence the fruit body of Agaricus is called basidiocarp. It consists of two parts. Stipe and fruit body. The unbranched stem-like part is called stipe. The circular portion above the stipe is called the annulus. The umbrella-like swelling is called the pileus. It has gills at the base of its digits. Swallow contains basidia. Basidium contains basidiospores. According to scientist Hawker (Hawker, 1966), a basidiocarp can produce about 1.8 billion basidiospores.