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

University of Illinois Herbarium
Catalog #: ILL00085115
s.n.
Oidium leucoconium Desm.

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00061080
Bertha von Thumen s.n.
Oidium leucoconium Desm.