? arctus Kütz. Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Chromista phylum Ochrophyta class Phaeophyceae order Ectocarpales family Ectocarpaceae genus Ectocarpus species Ectocarpus siliculosus Name Homonyms ? arctus Scudder, 1893 ? arctus Noël, 1973