Nature’s World Wide Web Underneath Our Feet
I got excited about mycelium when I learned that it provides nutrients to other plants (like in your garden) and that it communicates with the plants. So if a plant is in need of a nutrient that isn't present in it's location, the mycelium can obtain the nutrient from another location and transport it along the mycelium network to bring it to the plant in need! I think that is so cool!
Here's an article that explains the workings of mycelium.