Agrocybe
Agrocybe is a genus of mushrooms in the family Strophariaceae (previously placed in the Bolbitiaceae). The genus has a widespread distribution, and contains about 100 species. Distribution. Mushroom cultivation began with the Romans and Greeks, who grew the small "Agrocybe aegerita". The Romans believed that fungi fruited when lightning struck. In Europe, toxic forms are not normally found, but "Agrocybe molesta" could be confused with poisonous white "Agaricus" species or with poisonous "Amanita" species. The edible southern species "Agrocybe aegerita" is commonly known as the Poplar mushroom, Chestnut mushroom or Velvet pioppino (Chinese: 茶樹菇). It is a white rot  fungus and is a medium-sized agaric with a convex, almost flat, cap 3 to 10 cm in diameter. Underneath, it has numerous whitish radial plates adherent to the foot, later turning to a brownish-gray color, and light elliptic spores of 8-11 by 5-7 micrometres. The white fiber foot is generally curved, having a membraneous ring on the top part which promptly turns to tobacco color due to the falling spores. When very young, its color may be reddish-brown and later turn to a light brown color, more ocher toward the center and whiter around its  border. It grows in tufts on logs and holes in the poplars, and other trees of large leaves It is cultivated and sold in Japan, Korea, Australia and China. It is an important valuable source possessing varieties of bioactive secondary metabolites such as indole derivatives with free radical scavenging activity, cylindan with anticancer activity, and also agrocybenine with antifungal activity. "Agrocybe farinacea" of Japan, a species closely related to "Agrocybe putaminum", has been reported to contain the hallucinogen psilocybin, however there has been no recent chemical analysis carried out on this mushroom, nor any modern reports of psychoactivity.