Protococcus botryoides f. caldarium Tilden, 1898 Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Rhodophyta class Cyanidiophyceae order Cyanidiales family Cyanidiaceae genus Cyanidium species Cyanidium caldarium Name Homonyms Protococcus botryoides f. caldarium Tilden, 1898