Opegrapha atra f. tenuior Nyl. ex 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 f. tenuior Nyl. ex Leight. Opegrapha atra f. tenuior Nyl. Opegrapha atra f. tenuior Nyl. ex Stizenb.