The appearance is black and gray, and the surface is deeply cracked and very hard; the front end of the fungus tube is cracked, and the fungus hole is round, light white, and then dark brown; the fungus flesh is light yellow brown.Since the 16th century, it has been used as medicine for the treatment of malignant tumors, ulcers, tuberculosis, and viral infections in Russia and Europe. Chaga is very good for immune system, anti-virus anti-inflammatory. treatment of high blood pressure, high blood lipids, malignant tumors.