is a genus of polypores
which grow on wood. They can be differentiated from other polypores because they have a double walled basidiospore
The genus is divided into two sections - Section Ganoderma has a shiny cap surface (like Ganoderma lucidum) and Elfvingia has a dull cap surface, like Ganoderma applanatum.
The name Ganoderma is derived from the Greek ganos/γανος "brightness, sheen", hence "shining" and derma/δερμα "skin",