? pulverulentum Schaer. Dataset GBIF Backbone Taxonomy Rank UNRANKED Classification kingdom Fungi phylum Ascomycota class Lecanoromycetes order Rhizocarpales family Rhizocarpaceae genus Rhizocarpon species Rhizocarpon atroflavescens Name Homonyms ? pulverulentum Schaer. ? pulverulentum Thuill.