A.B. Seymour and F.S. Earle [1-550, plus extras]

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00062197
H. L. Merrow s.n. 12 May 1884
Peronospora obducens J. Schröter
United States, Michigan, Ann Arbor;

Michigan State University Herbarium non-lichenized fungi
Catalog #: MSC0214834
H. L. Merrow s.n. 12 May 1884
Peronospora obducens J. Schröter
United States, Michigan, Ann Arbor;

Miami University, Willard Sherman Turrell Herbarium
Catalog #: 000274580
H. L. Merrow #A7b 12 May 1884
Peronospora obducens J. Schröter
United States, Michigan, Washtenaw, Ann Arbor

Charles Gardner Shaw Mycological Herbarium, Washington State University
Catalog #: WSP28992
H.L. Merrow s.n. 12 May 1884
Peronospora obducens J. Schröter
United States, Michigan, Washtenaw, Ann Arbor

USDA United States National Fungus Collections
Catalog #: BPI 784556
Merrow, H. L. s.n. 12 May 1884
Plasmopara obducens (J. Schröt.) J. Schröt.
United States, Michigan, Ann Arbor