Ganoderma
This gallery covers both Ganoderma adspersum and Ganoderma applanatum.
I have not separated them due to the fact they are very similar and, from my observations, have the same affect on trees.
The common name of these fungi is the Artists Bracket. The underside is brilliant white and one can score the surface revealing the contrasting dark brown of the flesh, thus drawing.
They are extremely common on beech and oak, but I have seen them on cherry, birch, sorbus, apple, willow, maples and horse chestnuts.
The Ganodermas are important to arboriculture as they can cause dramatic failures of large trees. The decay tends to be a white rot,leaving white, spongy material behind. It appears to be far more destructive on trees that do not produce heartwood- such as beech and maples.
Ganoderma can produce very variable looking brackets, so identification may be hard. The flesh, however, is always a rich brown colour.
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