Beefsteak fungus also known as ox tongue (Fistulina hepatica) is parasitic bracket fungus which grows often on oak.

- Image ID: G6T9T7
Beefsteak fungus also known as ox tongue (Fistulina hepatica) is parasitic bracket fungus which grows often on oak.
Jukka Palm / Alamy Stock Photo
Image ID: G6T9T7
Location: Ruissalo, Turku, Finland