We do not identify mushrooms since many look-alikes are poisonous and the fact that there are thousands of different types and many are only specifically identified by their microscopic spores. This is a beautiful mushroom growing on the side of the tree. They actually require not only a dead branch to grow on but often a specific species of tree. I talked with another horticulturist and she recommended use visit a couple on line sources.

http://michiganmushroomhunters.org/default.htm or tom volk’s fungus page http://botit.botany.wisc.edu/toms_fungi/