The body of Agaricus is composed of slender, cylindrical, branched and multicellular colorless hyphae. Hyphae join together to form mycelium. It is a perennial fungus. The mycelium of Agaricus is acinocytic. That is, it is divided into many cells by a transverse wall. Each cell contains granular cytoplasm, multiple nuclei, lysosomes, ribosomes, endoplasmic reticulum, small cell cavities and oil droplets as stored food. Cell wall is made of chitin. It does not contain photosynthetic pigments. The mycelium intertwines to form a rope-like structure. It is called rhizomorph. A mushroom can produce a kilometer long hyphae in a day. Basidiocarps produced from the mycelium are located in rings above the soil. This type of ring is called Fairy ring.