Related Clues:

• 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
• Tiny plants found on rocks and trees
• Tiny plants found on rocks and tree-trunks
• It forms tufts on stones
• Tiny green-grey plants growing on rocks and trees
• Tiny green, grey or yellow plant found on rocks or trees
• It occurs on rocks or bare ground etc.
• It grows on rocks or bare ground
• It's found on rocks and tree-trunks
• At last the bird might grow on a rock
• Some might make this liken the sound of what's on stone
• Thus one may get fun with Gus on stone