Lichens are not single organisms, but the result of a symbiosis between a fungus and an alga or cyanobacteria. The body of lichen consists of the fungal hyphae that surround the cells of green algae or cyanobacteria. The lichen fungus provides its partner a benefit and gains nutrients in return. A great majority of the species of lichenized fungi are ascomycetes, while very few are basidiomycetes.


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