 Tylopilus alboater , commonly known as the black velvet bolete , is a bolete fungus in the Boletaceae family . The species is found in North America east of the Rocky Mountains , and in eastern Asia , including China , Japan , Taiwan , and Thailand . A mycorrhizal species , it grows solitarily , scattered , or in groups on the ground usually under deciduous trees , particularly oak , although it has been recorded from deciduous , coniferous , and mixed forests . 
