Guide Stems are a species of bioluminescent weed indigenous to Tallon IV.
The weed is quite pervasive, appearing all over ceilings and floors of Tallon Overworld. They are easily recognizable by the small orange bulbs, which are similar in color to the bulbs of Glowing Spidervines, on the tips of the stems.
- "Species:Guide stem
Pervasive indigenous species of bioluminescent weed." —Scan Data (Metroid Prime)