Described from oak apple galls and fallen buds of Quercus robur in the Netherlands and recently synonymized with Ciborinia candolleana, Sclerotinia bresadolae is reinstated as an independent species after studying Rick’s type material in Oudemans’s herbarium and fresh collections on oak apples from England and Germany. According to Boudier’s figures and published descriptions, and the study of two English collections, Ciborinia hirtella seems to be a synonym.