Related Clues:

• It lacks roots
• Jelly plant
• Lowlife?
• Pond scum
• Seaweed, e.g.
• Eukaryotic organism
• Aquarium annoyance
• Tiny aquatic plant
• Pond dweller
• Nonflowering plant
• Sargassum, e.g.
• Simple water dweller
• Irish moss, e.g.
• Marine growth
• It creates energy through photosynthesis