Yadong black fungus is produced on the thorn tree of the rose tree branch of the Yadong County forest in the southern foothills of the Himalayas at an altitude of 2800-3900 meters. The fresh fungus is coffee red, and the gum is thick; the dry body is black and looks like "black pearl". After the warm water is opened, only the size of the fingernail of the person is small, which is a small bowl. The product is rich in protein, fat, carbohydrates and a variety of vitamins and inorganic salts. The taste is crisp and smooth, and the meat is delicate and nutritious.