Fungus-alga composite
Else clues• Alga-fungus combination
• Alga-fungus symbiosis
• Beard moss, for one
• Fungus + alga
• Fungus-alga combo
• Fungus-alga union
• Fungus-algae alliance
• Fungus/alga symbiosis
• Growth on rock walls
• Growth on rocks
• Growth on trees and rocks
• Iceland moss
• It may grow on rocks
• Mossy growth
• Oakmoss, e.g.
• Rock fungus
• Rock growth
• Rock plant
• Source of litmus
• Symbiotic growth
• Symbiotic growth on trees and rocks
• Tree growth
• Tree-trunk cover, perhaps
• Woodsy growth
• Any thallophytic plant of the division Lichenes
• Occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.