Polytrichum arcticum Sw. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Bryophyta class Polytrichopsida order Polytrichales family Polytrichaceae genus Polytrichastrum species Polytrichastrum alpinum Name Homonyms Polytrichum arcticum (Schrad.) Wahlenb. Polytrichum arcticum Sw. ex Brid. Polytrichum arcticum Sw. Polytrichum arcticum Schrad.