F.K.A.E.J. de Thümen [1-750, plus extras]
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University of Illinois Herbarium
Catalog #: ILL00085285
s.n.
Oidium erysiphoides Fr.
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University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00061057
von Thumen s.n.
Oidium erysiphoides Fr.
Germany
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