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formed by fungi that live with photosynthetic algae or bacteria

The fungus provides its photosynthetic partner with shelter and protection

The photosynthetic partner in turn provides the fungus with food (sugar)

grow on a wide variety of materials (soils, tree trunks and branches, rocks, fences, roofs, and walls)

They are able to survive environmental extremes (newly formed volcanic islands, deserts)

Very diverse in form