This is a picture of a fallen tree in the woods behind my house. the green substance on the tree is most likely moss. The moss can represent lichen because both can be found on three trunks and are similar in appearance. Lichen is a symbiotic relationship between certain fungi and algae or cyanobacteria. The fungi in this relationship provide inorganic food and water, while the algae or cyanobacteria provide the organic food.
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