Riccia nigrella f. elongata Levier Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Marchantiophyta class Marchantiopsida order Marchantiales family Ricciaceae genus Riccia species Riccia nigrella Name Homonyms Riccia nigrella f. elongata Levier ex Müll.Frib. Riccia nigrella var. elongata (Levier ex Müll.Frib.) Jelenc Riccia nigrella f. elongata Levier