Riccia pseudofrostii f. natans (Torka) Schiffn. Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Marchantiophyta class Marchantiopsida order Marchantiales family Ricciaceae genus Riccia species Riccia rhenana Name Homonyms Riccia pseudofrostii f. natans (Torka) Schiffn.