The presence of a “fruiting body”, or conk, at the base of a tree or palm is a sign that the tree may be infected by a species of fungus called Ganoderma. There are several species of this fungus that affect different hosts. This one is Ganoderma sessile, and it affects oaks, maples, honeylocusts and other hardwoods. The conks appear annually in summer and fall at the base of the tree or on a lateral root close to the trunk. The fungus enters through wounds in the trunk commonly made [...]