A saprophytic polypore, the Lumpy Bracket is found on most kinds of hardwood trees but most commonly on Beech, forming brackets on standing timber and more often rosettes on the tops of stumps. It causes white rot. Often the pale upper surface is discoloured by green algae, the more so in the zones further from the margin. That and the slot-like pores (other whitish Trametes species have round or oval pores) makes this a very easy polypore to identify.
Found on nurse log in a wetland.