Phellinus is a genus of fungi in the family Hymenochaetaceae. Many species cause white rot. Fruit bodies, which are found growing on wood, are resupinate, sessile, and perennial. The flesh is tough and woody or cork-like, and brown in color. Clamp connections are absent, and the skeletal hyphae are yellowish-brown. The name Phellinus means cork. The species Phellinus ellipsoideus (previously Fomitiporia ellipsoidea) produced the largest ever fungal fruit body. Phellinus produces the natural phenol hispidin.