elk kelp

Elk kelp, scientifically known as Pelagophycus porra, is a large marine brown alga that can grow over 100 feet long. It belongs to the kelp family and is characterized by its split blades, giving it a tree-like appearance. This type of kelp is found in deep waters off the coast of southern California and into Mexico.12

Brown algae, including elk kelp, get their color from a brown pigment called fucoxanthin, which masks the green chlorophyll. These algae can vary greatly in size, from small, filamentous forms to the large giant kelps. Some brown algae, like elk kelp, have gas-filled bladders called pneumatocysts that help keep their photosynthetic parts near the water's surface. Historically, brown algae were a significant source of iodine and potash, and today, algin derived from them is used as a stabilizer in food products.32