Fistulina hepatica (beefsteak fungus)

Better known as the "Ox Tongue", this fungus mainly grows on oak and sweet chestnut trees. It takes advantage of tree wounds or holes to settle. When this fungus emerges on its host, it causes a colour change, but does not alter the structure of the wood. In fact the wood is reddish-brown and keeps its strength. In rarer cases, this wood is sought in cabinetmaking.