In the beginning, Madame M. A. Libert described Peziza sclerotiorum (24); that binomial for the fungus stood until Fuckel (14) erected and described the genus Sclerotinia; he chose to honor Madame Libert by renaming Peziza sclerotiorum with a newly coined binomial, Sclerotinia libertiana. According to Wakefield (40), Fuckel apparently disliked the combination S. sclerotiorum and elected to establish the -new one. Authors in the United States, and others elsewhere, accepted and used S. libertiana Fuckel until Wakefield (40) showed it to be inconsistent with the International Rules of Botanical Nomenclature, and cited G. E. Massee as the proper authority for Sclerotinia sclerotiorum (Lib.) Massee because he had used that binomial in 1895, but de Bary used it in his 1884 contribution (8). Thus, the proper name and authority for the subject fungus of this symposium seems to be Sclerotinia sclerotiorum (Lib.) de Bary. Although technically incorrect, name S. libertiana occasionally is used in this paper to be consistent with its use in the literature prior to 1924.