Anonymous, Calif. Fungi
Herbarium of the University of California. [1- ? 1425]

Cornell University, Plant Pathology Herbarium
Catalog #: CaliforniaF.01177
s.n.
Microsphaera diffusa Cooke & Peck

USDA United States National Fungus Collections
Catalog #: BPI 948887
s.n.
Microsphaera diffusa Cooke & Peck
United States, California