Oidium hortensiae Jørst. Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Fungi phylum Ascomycota class Leotiomycetes order Helotiales family Erysiphaceae genus Pseudoidium species Pseudoidium hortensiae Name Homonyms Oidium hortensiae Jørst. Oidium hortensiae Jørst. ex S.Blumer