Rhytisma salicinum f. umbonatum (Hoppe) Rabenh. Dataset Rank FORM Classification kingdom Fungi phylum Ascomycota class Leotiomycetes order Rhytismatales family Rhytismataceae genus Rhytisma species Rhytisma umbonatum Name Homonyms Rhytisma salicinum f. umbonatum (Hoppe) Rabenh.