F.K.A.E.J. de Thümen [1-750, plus extras]

University of Illinois Herbarium
Catalog #: ILL00085141
Prof. Passerini s.n.
Oidium violae Pass.

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00040987
ThÙmen #s.n. 00 May 1876
Oidium violae Pass.
Italy, bei Parma