Chlorophyllum molybdites, a tropical and poisonous mushroom appeared in 1980 at Takatsuki City, Osaka Prefecture, and expanded around the urban area of Osaka, and at the end of the 1980's invaded into the southern part of Kyoto Prefecture and Kyoto City. The reason of survival and expansion of this tropical mushroom in this area are discussed. Four cases of poisoning caused by this fungus are reported including the cases happened in Osaka and Kyoto recently.