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SUMMARY
A discomycete, Pyronema domesticum, was grown on medium containing SOO ppm 2,4-dichlorophenoxyacetic acid. Although many game- tangia and apothecia appeared to develop normally on this medium, abnormalities were commonplace. Abnormalities included a reduction in the total number of ascogonia and antheridia formed in a gametangial cluster, malformed gametangia, fusion of the trichogyne with a structure other than the antheridium, failure for plasmogamy to be completed, the apo-mictic production of ascogenous hyphae, and the conversion of apothecia into sterile sclerotium-like structures. In addition, the 2,4-D caused a 2–5 day delay in the maturation of all apothecia.