Related Clues:

• Simple plant
• Seaweeds, etc
• Plants such as seaweed
• Kelp beds, essentially
• Rootless pond growth
• Biodiesel source
• Bit of seaweed
• Pond scum, e.g
• Simple plant, plankton or seaweed say
• Seaweeds etc
• Bit of kelp, e.g
• Simple aquatic plant
• Oyster thief or mermaid's wineglass, e.g
• Pool slime
• Plankton piece