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Periphyton is a complex mixture of algae, cyanobacteria, heterotrophic microbes, and detritus. - wikipedia
in clumps or coating submerge surfaces.
Not much to look at but incredibly vital to aquatic ecosystems. In the Florida Everglades it forms cigar-shaped clumps when wet (as seen in these pictures) and when dry it can be seen as gray mats. Spotted at Pa-hay-okee Overlook in Everglades National Park. Learn a little more about it here: http://www.youtube.com/watch?v=_VhJ_2LTl...