Shelf Fungus growing on a pecan tree.
The tree was hit by lightning several years ago, splitting the bark. Woodpeckers hunting insects made two cavities in which some interesting fungi have grown.
The weight of this piece caused it to fold down.
I have not experimented with writing or drawing on pieces of this fungus to see if it serves the same purpose as Artist's Conk. If it works, it might make some interesting garden signs. Pieces in previous years fell to the ground and were eaten by animals, perhaps for the protein contained in the fungi.