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| Lichens on a rock. |
Saturday, February 14, 2015
Heart of the stone
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.
Explore some more: The lichen symbiosis - what is so spectacular about it?
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