I recently watched the documentary "Fantastic Fungi" and it had very interesting part about how myccelium have millions or billions of tiny roots connecting and crisscrossing through the soil all across the country, like a single macro lifeform conglomerating underground.

Most interesting was a comment about how we have recently discovered that trees communicate using these myccelium roots, things like signals of distress from lack of water or from nearby fires. I couldn't help but think of these roots as something like neural pathways. It is amazing how much we still have to learn about mushrooms.