Related Clues:
- Bit of scum
- Model Kate
- Sphagnum, e.g.
- Part of a pond problem
- Tree hugger?
- Cushiony forest seat
- Prince Edward Island crop, Irish _____
- Aquatic organisms
- Tree-trunk cover, perhaps
- Primitive water organism
- Non-flowering plant
- Rolling stones' lack
- Chlorophyll-containing microorganism
- Hart of Broadway
- Rock coat