Related Clues:
- Pond scum organism
- Small bit of rootless flora
- Reindeer moss, e.g
- Kate who Pete Doherty dated
- Fountain growth
- Fungus/alga symbiosis
- Primitive plants found on rocks
- Bit of 30-Down life
- Tree hugger
- Source of peat
- Bit of fish tank growth
- Plant on trunks
- Peat ingredient
- Tiny lake organism
- What a rolling stone is unlikely to gather