Ganoderma applanatum is a very common perennial bracket fungus. The underside is creamy white and can be scratched with a sharp point to leave brown marks and so produce artistic images - hence the common name.
This tough bracket lives for many years, developing noticeable annual growth ridges on the upper surface. If you cut through a bracket you will see layers of tube pores - the number of layers gives a clue to the age of the fruitbody.
