Related Clues:
- Kelp bit
- Plant in a pond
- Racing driver seen in three seconds?
- Bit of fish tank gunk
- Fuzzy green plant that grows on rocks
- Non-flowering plant growing in dense mats
- Bit of pond growth
- Growth on tree trunks
- It grows in the shade
- Simple plant, plankton or seaweed, say
- Bryophytic growth
- Growth on a damp rock
- What some proverbial stones don't gather
- Lawgiver shunning eastern tree-hugger?
- Some of the natural gases found in seaweed