Long regarded as atypical members of the plant kingdom, the fungi are now regarded as a separate kingdom of their own standing. Because mushrooms are so visible and figure so prominently as foods and drugs, we tend to think of mushrooms as the fungi themselves. But they aren’t. A mushroom is merely the reproductive structure of a much more expansive organism. This class will address the topics of what fungi are and are not, the attributes that make a creature a fungus, and the challenges to be faced in recognizing one fungus from another.