Brown algae

Brown algae belong to a very large group, the Heterokontophyta, a eukaryotic group of organisms distinguished most prominently by having chloroplasts surrounded by four membranes, suggesting an origin from a symbiotic relationship between a basal eukaryote and another eukaryotic organism.

Brown algae

It belong to the division phaeophyta and contain chlorophyll A and C along with pigment fucoxanthin.
They are marine algae, largest being the giant kelp. They are used as food largely in Asia, and as thickeners in ice-cream, paints, toothpaste and lipstick.