The clouded agaric (Clitocybe nebularis) belongs to the Tricholomataceae family. It is a mushroom that is native all over Japan, as well as the Northen Hemisphere widely. This mushroom grows in low mountain forests. The stem stout, swollen towards the base, and it can reach 3-6 cm in height. The cap is smooth surface, grayish to light brownish-gray, and 6-15 cm across. It has a foul-smelling odor. This mushroom is not edible.