Collins, Holden & Setchell, Phycoth. Bor.-Amer.
Collins, F.S.; Holden, I.; Setchell, W.A. [1-2300]

Brown University - Algae
Catalog #: ABRU00003593
W. A. Setchell s.n. 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, west shore of Amaknak Island, Unalaska Bay, AK

University Herbarium, University of California, Berkeley
Catalog #: UC1856616
W. A. Setchell #3260 23 June 1899
Monostroma grevillei var. arcticum (Wittrock) Rosenvinge
United States, Alaska, Amaknak Island, Alaska

Field Museum of Natural History
Catalog #: C0526508F
W. A. Setchell #s.n. 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, Aleutians West, west shore of Amaknak Island, shallow pools

University Herbarium, University of California, Berkeley
Catalog #: UC98051
W. A. Setchell #s.n. 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, West shore of Amaknak Island

Miami University - Algae
Catalog #: 000187572
W. A. Setchell #s.n. 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, west shore of Amaknak Island

Drexel University, Academy of Natural Sciences - Algae
Catalog #: PH00205380
5f19be27-e69c-4e74-83b7-079fa795acf2
W. A. Setchell; A. A. Lawson #910 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, west shore of Amaknak Island, Unalaska Bay; 53.911089 -166.54079

University of Michigan
Catalog #: 730160
W.A. Setchell #s.n. 23 June 1899
Monostroma articum Wittrock
United States, Alaska, west shore of Amaknak Island

University of Michigan
Catalog #: 730247
W.A. Setchell #s.n. 23 June 1899
Monostroma grevillei (Thuret) Wittrock
United States, Alaska, west shore of Amaknak Island

Michigan State University Algae
Catalog #: MSC0183539
W.A. Setchell #s.n. 23 June 1899
Monostroma grevillei var. arcticum (Wittrock) Rosenvinge
United States, Alaska, west shore of Amaknak Island

Yale University Herbarium
Catalog #: YU.091993
William Albert Setchell s.n. 23 June 1899
Monostroma arcticum Wittrock
United States, Alaska, west shore of Amaknak Island, Unalaska Bay, AK