Ellis & Everhart, N. Amer. Fungi. Ser. II
J.B. Ellis ; B.M. Everhart [1501-3600, plus extras]

USDA United States National Fungus Collections
Catalog #: BPI 959549
s.n.
Didymium clavus (Alb. & Schwein.) Rabenh.
United States

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00050826
O. F. Cook, Jr. s.n. 00 December 1887
Didymium clavus (Albertini & Schweinitz) Rabenhorst
United States, New York, Clyde;

Chrysler Herbarium - Mycological Collection
Catalog #: CHRB-F-0005895
O. F. Cook, Jr. s.n. 00 December 1887
Didymium clavus (Alb et Schwein) Rabenh
United States, New York, Wayne, Clyde;

Miami University, Willard Sherman Turrell Herbarium
Catalog #: 000247816
O. F. Cook, Jr. #2091 00 December 1887
Didymium clavus (Alb. & Schwein.) Rabenh.
United States, New York, Wayne, Clyde

Michigan State University Herbarium non-lichenized fungi
Catalog #: MSC0258313
O.F. Cook s.n. 00 December 1887
Didymium clavus (Albertini & Schweinitz) Rabenhorst
United States, New York, Clyde;

Cornell University Plant Pathology Herbarium
Catalog #: CUP-M-0254
O.F. Cook, Jr. #521 00 December 1887
Didymium clavus Rost.
United States, New York, Wayne, Clyde;

University of Illinois Herbarium
Catalog #: ILL00099296
OF Cook, Jr s.n.
Didymium clavus (Albertini & Schweinitz) Rabenhorst
United States, New York, Wayne, Clyde; Clyde

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0088908
OF Cook, Jr s.n.
Didymium clavus (Albertini & Schweinitz) Rabenhorst
United States, New York, Wayne, Clyde

Academy of Natural Sciences of Drexel University
Catalog #: PH00300094
Orator Fuller Cook #s.n. 00 December 1888
Didymium clavus (Alb. & Schwein.) Rabenh.
United States, New York, Wayne, Clyde

Academy of Natural Sciences of Drexel University
Catalog #: PH00314145
Orator Fuller Cook #s.n.
Didymium clavus (Albertini & Schweinitz) Rabenhorst
United States, New York, Wayne, Clyde