Growth of lichen on wooden steps.
A lichen is a composite organism that arises from algae or cyanobacteria (or both) living among filaments of a fungus in a symbiotic relationship. The combined life form has properties that are very different from the properties of its component organisms.
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Photo credit: © Peter Steiner / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: abstract, art, attach, attaching, damp, flakes, flaky, fungus, gray, green, growing, growth, horizontal, lichen, moss, parasite, substrate, symbiotic, wood
