What are lichens? How do fungi participate in this ecological interaction?

What are lichens? How do fungi participate in this ecological interaction?
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Lichens are formed by mutualist ecological interaction between fungi and algae or between fungi and cyanobacteria. In this ecological interaction, the fungi absorb water that is then used by algae (or cyanobacteria), and algae (or cyanobacteria), as autotrophs, produce organic material in excess to serve as food for the fungi. Fungi Kingdom Review - Image Diversity: lichens
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