She grunts, for a moment caught between being angry and not being angry.

"Okay, look. The bit of the mushroom that grows where you can see it? That's not the mushroom. Or at least it's just the tiniest bit of it. It's like... well, it's like one flower on a whole big tree. The mushroom grows through the whole forest, all tangled up with the roots of the trees and undergrowth. You can't hardly see it, because it's made of these tiny, tiny little threads." Ylva gestures expansively and meaninglessly, trying to communicate the vastness of this idea in vain. "The trees feed it, actually. And then they give the mushroom messages. Not in words, or sounds, but more like. A little package made of a message that only other trees could make sense of. They give those to the mushroom, and it carries them to other trees, through those threads, to other roots. Whole forests, just having quiet conversations about when they should make acorns, or how to grow without running into each other."

Talking about this has her excited, her face flushed. "No one realises it. But it's there and it's important. And I mean, that's not all mushrooms, there are other types of mushrooms that live in different ways, but some mushrooms are doing that, all the time."