J.T.C. Vestergren [1-1800, plus extras]

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0074673
s.n.
Oidium quercinum Thüm.

USDA United States National Fungus Collections
Catalog #: BPI 1039661
s.n.
Oidium quercinum Thüm.

USDA United States National Fungus Collections
Catalog #: BPI 409742
Hariot P. s.n. 14 June 1908
Oidium quercinum Thüm.
France, Lardy, near Paris

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00061110
P. Hariot s.n. 14 June 1908
Oidium quercinum Thüm.
France, Gallia: Lardy prope Parisios