Lichen is a composite organism made up of algae or cynobacteria (or both) living within the filaments of a fungus. The relationship between the two or three organisms is symbiotic or mutually beneficial. They live and thrive in the harshest of environments where the temperature extremes are severe and they receive very little moisture. Geologists and botanists believe that lichens have lived for thousands of years. I like them for their color and their patterns. When you are looking for plants in a desert, you sometimes have to be content with what you find.
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