Biologists have long known mushrooms of the genus Mycena, commonly known as bonnet mushrooms, as fungi that live off of dead trees and plants. New research from the University of Copenhagen demonstrates that bonnets can also find their ways into young, healthy trees and plants, where they try to cooperate. In doing so, they have made an evolutionary leap which challenges our understanding of the ecological roles of fungi.
Article says it only moved to living trees and that its a symbiotic relationship. Which to my understanding of trees, they already do this with other fungi, and this one is just tagging along as well.
The last of us this is not, not even close.