Nemacystus posidoniae (Menegh.) Hauck Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Chromista phylum Ochrophyta class Phaeophyceae order Ectocarpales family Chordariaceae genus Cladosiphon species Cladosiphon mediterraneus Name Homonyms Nemacystus posidoniae (Menegh.) Hauck