Predominantly white rot in stems and roots, in later stages also death of parts of the crown; fruiting bodies often around the stem on the soil surface, but always growing from infected roots; they consist of several, leathery lobed caps arranged like roof tiles above each other. The lobes are yellow brown and show zones on their surface. The whole fruiting body can reach up to 1m in size; the lower surface turns black, if touched.
A common cause of rot of beech and oaks, more rarely of other broadleaved trees and very rarely of conifers; root rot reduces markedly the stability of the tree. The resistance against breakage is not much affected. This species can be mistaken for Grifola frondosa (greyish-brown hats, without zones, no dicoloration of the lower surface if touched).
Curative measures If there are already fruiting bodies the diametre of the residual wall should be checked, as well as the extension of root rot. Diseased trees should be removed to avoid spreading of the fungus to healthy trees growing nearby.
fruiting bodies of Meripilus giganteus
fruiting bodies of Meripilus giganteus, apparently growing on soil around a beech
fruiting bodies of Meripilus giganteus: growing zones