Moss is the only fungus that I know of that grows on the north side of an Oak Tree. It is not edible, but great for plants as it holds the water in the pot.

Yes, I have two large oak trees at my house and a fungus grows on or near the base in the early fall. It looks like a series of little fans and can grow to be as big as a man's head, or bigger. When I first moved into my house, one morning I saw my neighbor circling around the yard, obviously looking for something. Curious, I asked him what he was looking for and he told me mushroooms. He told me the mushrooms that grow on the side of the tree are edible and asked if he could have any that were growing there. He explained to me how he likes to eat them. He pulls the fungus out of the ground. He checks to see if there are any "animals" living under the fungus. If there are, he keeps it. If not, he says not to take it. Then you take it home and clean it. Next, boil it in salted water for about an hour. Once boiled, let it cool and try to seperate out the individual "fans" of the mushroom. Soak up any additional water with a paper towel. Next, dredge the pieces in seasoned flour and fry in olive oil. Sprinkle with salt while hot and eat quickly. They wil get soggy fast. My neighbor who told me about the mushrooms is Italian. Apparently, among the members of Italian community this is something of a delicacy. I've had several of these mushrooms "stolen" out of my house, sometimes even in braod daylight!