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Phaeophyta or brown algae are a group of autotrophic, multicellular organisms, belonging to the class Phaeophyceae in the division Chromophyta. They contain the xanthophyll pigment - fucoxanthin, in addition to chlorophyll a and c. Hence, the members of phaeophyta exhibit a characteristic greenish-brown color.
Like other algae, the distribution of brown algae is broad, from tropical to polar zones, but brown algae can be found in intertidal zones, near coral reefs, and in deeper waters, with a NOAA study noting them at 165 feet in the Gulf of Mexico. Classification of Brown Algae