Athyrium angustum f. typicum Butters Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Plantae phylum Tracheophyta class Polypodiopsida order Polypodiales family Athyriaceae genus Athyrium species Athyrium angustum Name Homonyms Athyrium angustum f. typicum Butters Athyrium angustum var. typicum Wherry