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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.
1 Brown algae are eaten by herbivorous organisms such as fish, gastropods and sea urchins. 2  Benthic (bottom-dwelling) organisms also utilize brown algae such as kelp when pieces of it sink to the sea floor to decompose. 3  Brown algae are used to produced alginates, which are used as food additives and in industry.his type of marine algae is brown, olive or yellowish-brown in color. Brown algae contains contains chlorophyll a and c and a pigment called fucoxanthin, which gives it its color.