Lichens are a classic example of symbiosis -- the close association of two or more species. In fact, the word "symbiosis" (literally, "together living") was coined in order to describe lichens. The structure of a lichen is formed by a fungus. Meanwhile, cells of algae and/or cyanobacteria are embedded within the fungus and perform photosynthesis to capture energy. Although symbioses are not always harmonious relationships, the lichens pictured below appear to be the symbol of affection.
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| Lichens on a rock. |
Explore some more:
The lichen symbiosis - what is so spectacular about it?
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