The Glowcap Family contains various underground species of plants.
Common Glowcap
The Common Glowcap is only found in underground levels. They let out an ominous glow in various colors such as blue and green. They are mainly used as scenery.
Glowstem
Glowstems, like the Common Glowcaps, are only found underground and mainly used as scenery. They glow green and orange. If touched, the Glowstems will flicker for a moment, and then return to normal. Interestingly, Glowstems are not actual plants, rather they are LEDs; (Light-emitting diodes).