Bryum hyperboreum Bryhn & Ryan Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Plantae phylum Bryophyta class Bryopsida order Bryales family Bryaceae genus Ptychostomum species Ptychostomum arcticum Name Homonyms Bryum hyperboreum Gunnerus ex With. Bryum hyperboreum Gunnerus Bryum hyperboreum Gunnerus ex Dicks. Bryum hyperboreum Bryhn & Ryan