brown algae macrocystis pyrifera washed ashore during a storm, santa catalina island, california

alga algae algal flora algology america avalon beach biology brown seaweed bubble california catalina island closeup coast coastline cryptophyta ecosystem forest giant grass green kelp macrocystis pyrifera marine nature ocean oxidation oxygen in water synthesis photosynthesis plant sand santa sea ecology weed seascape seashore selfpurification of shore waves