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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.
All brown algae are multicellular. Although some of the larger species such as the giant kelps appear to have stems and leaves, they are not true stems and leaves such as those found in the vascular plants, because they do not contain true vascular tissue.