Giant Polypore (meripilus giganteus)

A rough fungus arranged around the roots of a large tree

A danger sign for a tree

Names: Meripilus giganteus, Giant Polypore
Hosts: Broadleaves, usually Beech
Attacks: Roots
Consequences: Wood becomes soft, may lead to upper root fracture and windthrow.
The giant Polypore is inedible but looks similar to Hen of the Woods (Grifola frondosa). The fungal cap produces an enzyme that is being trialed as an anti-cancer drug.