Multiple choice botany living world lichen lichens lichens ( the nature's pioneers ) Lichen is an example of ___________. Commensalism Mutualism Parasitism Mycorrhizal association Reveal answer Fill a bubble to check yourself B Correct answer Explanation Lichens are not a single organism, but, rather, an example of a mutualism in which a fungus usually a member of the Ascomycota or Basidiomycota phyla lives in close contact with a photosynthetic organism