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Lichen | Definition, Symbiotic Relationship, Mutualism, Types, Facts . . . lichen, any of about 15,000 species of plantlike organisms that consist of a symbiotic association of algae (usually green) or cyanobacteria and fungi (mostly ascomycetes and basidiomycetes) Lichens are found worldwide and occur in a variety of environmental conditions A diverse group of organisms, they can colonize a wide range of surfaces and are frequently found on tree bark, exposed rock
What Is a Lichen? Definition and Facts - Science Notes and Projects A lichen generally consists of layers of fungi and algae Cyanobacteria, when present, form little pockets on the upper layer (cortex) so they get sunlight The structures have special names: Thallus: The thallus is the nonreproductive “body” of a lichen This is the part of the lichen that is visually prominent