Fucus tortilis var. angustifolius C.Agardh, 1812 Dataset GBIF Backbone Taxonomy Rank VARIETY Classification kingdom Chromista phylum Ochrophyta class Phaeophyceae order Fucales family Sargassaceae genus Sargassum species Sargassum siliquastrum Name Homonyms Fucus tortilis var. angustifolius C.Agardh, 1812