I will say that my only problem with Simard is that she anthropomorphizes the fungi and the behaviors she documented could just as easily be explained by osmotic pressure. Chemicals in a solution of water have “fairness” built into them. The broker doesn’t need to have a strategy for exchange, just siphon off a finder’s fee for making the introductions. The magic is low friction channels that can move solutions over a long (for a single celled organism) distance. That’s magic enough for any kingdom of life.

Sugary sap? Water will enter and sugars flow out. High nitrogen content? Same same.