Usnea ceratina f. incurviscens Arnold Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Fungi phylum Ascomycota class Lecanoromycetes order Lecanorales family Parmeliaceae genus Usnea species Usnea ceratina Name Homonyms Usnea ceratina f. incurviscens Arnold Usnea ceratina var. incurviscens (Arnold) H.Olivier Usnea ceratina subsp. incurviscens Arnold, 1884