Fucus serratus is a type of brown seaweed that is commonly found in the North Atlantic and the North Pacific Ocean. It is known for its distinctive serrated edges and olive-green color. While this is the most commonly used name for this type of seaweed, there are several other synonyms that are used to describe it. These include Ascophyllum serratum, Fucus ceranoides, and Fucus vesiculosus var. serratus. Regardless of the name that is used, Fucus serratus is an important part of many coastal ecosystems and is used for a variety of purposes, including as a food source for animals and humans, and in the production of fertilizers and cosmetics.