Related Clues:

• Water plant
• 'A rolling stone gathers no ....'
• Water plant with no stem or leaves
• Tiny plants found on rocks, tree-trunks etc
• Crusty, tufty growth on trees and stones
• Tiny plant found on rocks and trees
• Small plants found on tree-trunks and stones
• Tiny plants growing on rocks and treetrunks
• Water plant for a gal
• Stirling . . . ., Kate . . . .
• 'A rolling stone gathers no . . . .'
• Tiny plants found on rocks and trees
• A rolling stone gathers none
• Tiny plants found on rocks and tree-trunks
• It forms tufts on stones