Dumontia calvadosii J.V.Lamour. ex Duby Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Rhodophyta class Florideophyceae order Nemaliales family Liagoraceae genus Helminthocladia species Helminthocladia calvadosii Name Homonyms Dumontia calvadosii J.V.Lamour. ex Duby Dumontia calvadosii J.V.Lamour.