J.B. Ellis, B.M. Everhart, and E. Bartholomew [1501-5100, plus extras]

Brown University Herbarium
Catalog #: CBRU00001161
G Hansen s.n.
Marsonia nigricans
United States, California, Amador, Jackson;

Purdue University, Kriebel Herbarium
Catalog #: PUL00019289
G Hansen s.n.
Marsonia nigricans
United States, California, Amador, Jackson;

University of California Berkeley, University Herbarium
Catalog #: UC152213
G. Hansen s.n.
Marssonina potentillae (Desm.) Magnus
USA, California, Jackson

University of Nebraska State Museum, C.E. Bessey Herbarium - Fungi
Catalog #: NEB00058268
Geo. Hansen s.n.
Marssonia nigricans Ellis & Everh.
United States, California, Jackson; Jackson

Michigan State University Herbarium non-lichenized fungi
Catalog #: MSC0219768
Geo. Hansen s.n.
Marsonia nigricans
United States, California, Jackson;

Clemson University Herbarium
Catalog #: CLEMS-F0002538
Geo. Hansen #2674
Marsonia nigricans
United States, California, Jackson; Jackson; 38.34889 -120.77306

Academy of Natural Sciences of Drexel University
Catalog #: PH00323282
Geo. Hansen #N. A. F. 2674
Marssonia nigricans Ellis & Everh.
United States, California, Jackson;

University of Wisconsin-Madison Herbarium
Catalog #: WIS-F-0022139
George Hansen #s.n.
Marssonina nigricans (Ellis & Everh.) Magnus
United States, California, Jackson