1.09.12 Birch conk, Chaga, and Clinker Polypore are some of the common names for Inonotus obliquus. Found most commonly on Yellow Birch, often at the site of a wound, the irregularly-shaped fungus looks like a piece of burned wood. This slow-growing fungus is found on yellow birches in northern European and Asian countries, as well as in northern US and Canada. It has been the subject of medical research for its apparent anti-cancer properties.