White-backed black fungus is also called hairy fungus (different from Northeastern black fungus), also known as single-leaf vitex, vitex cotyledon, and white-backed five-finger orange. The front is black and the back is gray-white, with a layer of tiny The villi have unique effects on treating and preventing cardiovascular and cerebrovascular obstruction diseases in middle-aged and elderly people, as well as lowering blood lipids and blood pressure. They also have a good preventive and therapeutic effect on constipation in the elderly.