Scytosiphon lomentaria is in the Scytosiphonaceae family within the Dictyosiphonales order and under the Phaeophyceae (a large multicellular algae group).
Family: Scytosiphonaceae Order: Dictyosiphonales Phaeophyceae The brown algae (singular: alga), comprising the class Phaeophyceae, are a large group of multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere. 
