Related Clues:
- Fuzzy green stuff
- Rolling stone's lack?
- Some spores, all grown up
- Forest floor growth
- Bit of aquarium gunk
- Bit of rootless flora
- Film bit
- Green organism
- Damp area growth
- Unwanted organism in an aquarium
- "A rolling stone gathers no ___"
- Lake plant
- Velvety green growth
- Pool organism
- Part of many a snail's diet