Fungus on oak limb

Fungus on oak limb

Observation - Fungus on oak limb. Description: About 3cms across, quite of few of these growths are emerging from the limb of an oak tree that dropped off the tree last year. They seem to like the shady side. Recently emerged, so they may grow bigger I suppose. Ideas?

About 3cms across, quite of few of these growths are emerging from the limb of an oak tree that dropped off the tree last year. They seem to like the shady side. Recently emerged, so they may grow bigger I suppose. Ideas?