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Red Moss – Point Lobos State Natural Reserve, California
The orange, velvety "stuff" especially noticeable on trees and rocks of the shadowed north-facing slopes at Point Lobos is a green algae named Trentepohlia. Its orange color comes from carotene, a pigment which also occurs in carrots, which mask the green of the chlorophyll. The growth of this algae does not harm the trees.
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