Giant kelp - Macrocystis pyrifera

"Macrocystis pyrifera", commonly known as giant kelp or giant bladder kelp, is a species of kelp (large brown algae), and one of four species in the genus "Macrocystis". Giant kelp is common along the coast of the eastern Pacific Ocean, from Baja California north to southeast Alaska, and is also found in the southern oceans near South America, South Africa, and Australia.