Organisms in the phyla of Rhodophyta are often called "red algae". These protists are multicellular and marine dwelling, however, they are often found in tropical zones and deep ocean. This algae is also eaten by humans and is a good source of iodine.

Dulse (Rhodymenia Palmetta)
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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