Except nobody asked it if was the other way around - that the mushroom is a tree farmer keeping in touch with all its trees nurturing and transporting stuff between them
Trees were there before fungi I think, at least the kind that can digest tree. So perhaps not all, that’s why we have coal. Trees just died but didn’t rot. They were compacted by other trees falling on top ad infinitum(ish).
Correct. there was actually a period of time when trees had no predators or scavengers that could break down their body matter. They actually likely caused mass extinction events during that time.
IFL Science article (I cross-referenced this with multiple other articles and it seems to talk about a cempletely different mechanism for mass extinction to occur)