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

University of Illinois Fungarium - Fungi
Catalog #: ILL00085285
s.n.
Oidium erysiphoides Fr.

USDA United States National Fungus Collections
Catalog #: BPI 1033971
Thumen #s.n.
Oidium erysiphoides Fr.
Austria, Klosterneuburg

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00061057
von Thumen s.n.
Oidium erysiphoides Fr.
Germany