Related Clues:

• Primitive water plant
• Bit of seafloor flora
• Tiny pond plant
• Seaweed
• Kelp, e.g.
• Reef denizen
• Aquarium growth
• Sea moss constituent
• Pool life form
• Sea lettuce, e.g.
• Plankton component
• Chlorophyllous plant
• Aquatic plant
• Pond floater
• Pond scum component