Organisms in the phyla Phaeophyta are also know as "brown algae". They are multicellular and live in marine coastal areas. They reproduce sexually and have a variety of uses for humans. They contain iodine which is good for our thyroid glands and are eaten in many cultures.

Kelp (Macrocystis pyrifera)
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Protista. (2004, November 2). Retrieved from http://biology.clc.uc.edu/courses/bio106/protista.htm
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Kingdom protista. (2010). Retrieved from http://www.esu.edu/~milewski/intro_biol_two/lab_8_protista/Protista.html