Opegrapha atra f. nigrata Leight. Dataset GBIF Backbone Taxonomy Rank FORM Classification kingdom Fungi phylum Ascomycota class Arthoniomycetes order Arthoniales family Arthoniaceae genus Arthonia species Arthonia atra Name Homonyms Opegrapha atra var. nigrata Leight. ex Mudd Opegrapha atra var. nigrata Leight. Opegrapha atra f. nigrata Leight.