Poelt & Scheuer, Reliqu. Petrak.
Institut für Systematische Botanik der Universität [1-2859]

Cornell University Plant Pathology Herbarium
Catalog #: Rel.Petrak.0501
s.n.
Sphaerotheca volkartii S. Blumer

USDA United States National Fungus Collections
Catalog #: BPI 993499
s.n.
Sphaerotheca volkartii S. Blumer