Related Clues:
- Principal ingredient of laverbread
- Laver, maybe, put dread into top player
- Major source of oxygen in the earth's atmosphere
- Kind of seaweed
- It helps turn a pond green
- Fish food plant
- Hijiki or arame, in a Japanese restaurant
- Plant that lacks true roots and leaves
- Plant used in making biofuel
- Bladderwrack, e.g.
- It may wash up on 43-Across
- Marine algae filling children with wonder
- Simple pond plant
- Macroalgae
- Floating sea plant