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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.
Phaeophyta (Brown Algae) Phaeophyta contain brown pigments called xanthopylls , as well as carotene and chlorophyll a and c . They use the polysaccharide laminarin and oils as food reserves and have cell walls composed of cellulose and alginic acid , which is used in numerous foods as a thickener.