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Lichens and Other Things That Grow on Trees
A photo illustrating the many shapes, sizes, and beauty of lichens.
Lichens are composite organisms made up of a fungus and usually a green alga, or sometimes a cyanobacterium. Many different species of fungi and different species of algae may combine into a number of different shapes and colors of lichens. They can be found in rainforests, on the arctic tundra, and in deserts.
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