Brown algae

Brown algae are a group of multicellular marine algae commonly found in coastal waters. They belong to the class Phaeophyceae and are characterized by their brownish color, which results from pigments like fucoxanthin. These algae can range from small filaments to large seaweeds, such as kelp, which form underwater forests providing habitat for many marine species. Brown algae play a vital role in their ecosystems by producing oxygen, acting as food sources, and helping to stabilize coastlines. They are also harvested commercially for uses in food, cosmetic products, and as sources of alginate, a thickening agent.