Claim: Scytosiphon lomentaria is in the Scytosiphonaceae family within the Dictyosiphonales order and under the Phaeophyceae (a large group of multicellular algae).
Evidence: Family: Scytosiphonaceae Order: Dictyosiphonales Class: 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.