I don’t view this as a formal answer, but it is interesting nonetheless:
Mycelium is how fungi feed. Some organisms — such as plants that photosynthesize — make their own food. Some organisms — like most animals — find food in the world and put it inside their bodies, where it is digested and absorbed. Fungi have a different strategy. They digest the world where it is and then absorb it into their bodies…
The difference between animals and fungi is simple: Animals put food in their bodies, whereas fungi put their bodies in the food.
…to embed oneself is an irregular and unpredictable food supply as mycelium does, one must be able to shape-shift. Mycelium is an living, growing, opportunistic investigation — speculation in bodily form.
That is from the new and excellent book by Merlin Sheldrake, Entangled Life: How Fungi Make Our Worlds, Change Our Minds, & Shape Our Futures.