Fig. 3

Photomicrographs of unstained urediniospores of Puccinia abrupta var. partheniicola—a mass of spores, bright-field 100× (A); a mass of spores, differential interference contrast (DIC) 400× (B); single spore, DIC 1000×, arrows point at individual spines (C); single spore, DIC 1000×, arrows point at individual spines (D)