What kind of relationship best describes the interaction between Fungi and algae in lichen?

What kind of relationship best describes the interaction between Fungi and algae in lichen?
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In some ways, the symbiotic relationship between lichens and algae seems like a mutualism (a relationship in which both organisms benefit). The fungus can obtain photosynthates from the algae or cyanobacterium and the algae or cyanobacterium can grow in a drier environment than it could otherwise tolerate.
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