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SUMMARY
A new genus, Whetselinia Korf & Dumont, is proposed for that portion of the genus Sclerotinia Fuckel which includes the economically important plant pathogen IV. sclerotiorum (Lib.) Korf & Dumont and also W. tuberosa (Hedw. per Mérat) Korf & Dumont. Characters differentiating the new genus from Sclerotinia (= Ciborinia Whetzel) and from Myriosclerotinia Buchw. are noted. Though many species have recently been placed in synonymy with W. sclerotiorum, the detailed anatomical studies necessary to evaluate such synonymies have never been done.