Sargassum polycystum subsp. horridulum Grunow, 1874 Dataset GBIF Backbone Taxonomy Rank SUBSPECIES Classification kingdom Chromista phylum Ochrophyta class Phaeophyceae order Fucales family Sargassaceae genus Sargassum species Sargassum polycystum Name Homonyms Sargassum polycystum var. horridulum Grunow, 1874 Sargassum polycystum subsp. horridulum Grunow, 1874