The difference between Lichen and Macrolichen
When used as nouns, lichen means any of many symbiotic organisms, being associations of fungi and algae, whereas macrolichen means any lichen that has a large thallus, often resulting in a bushy appearance.
check bellow for the other definitions of Lichen and Macrolichen
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Lichen as a noun:
Any of many symbiotic organisms, being associations of fungi and algae; often found as white or yellow patches on old walls, etc.
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Lichen as a noun (figurative):
Something which gradually spreads across something else, causing damage.
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Macrolichen as a noun (biology):
Any lichen that has a large thallus, often resulting in a bushy appearance.