Mycelium Coil is used to activate the green, glowing pools you find in an area. Once you pull the bulbous top from the Coil, you can no longer jump across platforms. To carry a bulb across platforms, suck the bulb so that you're holding it then aim onto the platform that you need to jump on. Throw the Mycelium Coil's bulb and grab it again. Repeat to get it across multiple platforms.