|Dead man's fingers|
Deadman's fingers (or dead man's fingers)
Xylaria = wood
Poly = many
Morpha = form
Deadman's fingers are black, knobby fingers that grow out of dead wood. They can be up to 4" tall and are white inside. See here for a look inside. This is a fairly common fungus that the kids and I have seen almost every time we go out in the woods.