F.K.A.E.J. de Thümen [1-2300, plus extras]

USDA United States National Fungus Collections
Catalog #: BPI 1035291
s.n.
Oidium violae Pass.

USDA United States National Fungus Collections
Catalog #: BPI 409808
Passerini G. s.n.
Oidium violae Pass.
Italy, Parma Botanic Garden

University of Illinois Herbarium
Catalog #: ILL00076829
Prof. G. Passerini s.n.
Oidium violae Pass.

Chrysler Herbarium - Mycological Collection
Catalog #: CHRB-F-0012681
Prof. G. Passerini s.n.
Oidium violae Pass.
Italy, Parma;

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00040988
ThÙmen #s.n.
Oidium violae Pass.
Italy, Parma