Chaga freshly harvested from the Birch tree needs to be processed before you can make Chaga tea. Processing the Chaga right away is recommended as it is much easier to deal with when fresh than if you let it dry first.
Human use of birch tar, which is made by further reducing the birch oil, dates back thousands of years with evidence of it being used to attach arrowheads, build canoes and even being used as a chewing gum.
Inonotus obliquus, commonly known as Chaga mushroom is a parasitic fungus that grows on living birch trees. The fungus relies on nutrient uptake through the tree in order to grow. When the birch tree dies, so does the fungus.