SUMMARYBiatorella resinae, a discomycete, was demonstrated to be the ascigerous stage of the pycnidial form,Zythia resinae, by means of single-ascospore and single-conidial cultures.The hosts upon which the apothecial and pycnidial stages ofBiatorella resinaehave been collected during this study and their geographical distribution are reported herein.Inoculation tests with artificial cultures ofBiatorella resinaeonPinus strobusfailed to show that this fungus was parasitic on the conifer.