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

University of Illinois Herbarium
Catalog #: ILL00085116
s.n.
Ascospora pulverulenta Riess

University of Nebraska State Museum, C.E. Bessey Herbarium
Catalog #: NEB00082977
Thumen s.n.
Ascospora pulverulenta Riess
Germany, Bayern: bei Bayreuth