Kelp
Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.
Pterygophora californica
Pterygophora californica is a large species of kelp, commonly known as stalked kelp. It is the only species in its genus Pterygophora (Ruprecht, 1852). It grows in shallow water on the Pacific coast of North America where it forms part of a biodiverse community in a "kelp forest".