“Mushrooms are only a small part of fungal anatomy. A mushroom is just how a fungus has sex.” Maisie’s slim eyebrows arched high. “Oh, really,” she said. “It’s true. A single fungus in a forest like this can go on for miles, underground, wrapping itself around tree roots. The mushrooms are just its reproductive parts. Fungi are some of the largest living things on Earth. Each tendril is nearly microscopic, but put together they can weigh far more than any California redwood or blue whale.”