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Answer:
LICHEN
Possible Questions:
Tree growth
Fungus
Rock growth
Growth on a rock
Mossy growth
It grows on rocks
Fungus-alga union
Woodsy growth
Tree-trunk cover, perhaps
Symbiotic growth
Source of litmus
Reindeer moss, e.g.
It may grow on rocks
Iceland moss
Growth on trees and rocks
Growth on rock walls
Fungus + alga
Alga-fungus symbiosis