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

Brown University - Algae
Catalog #: ABRU00005099
F. Johansen s.n.
Enteromorpha torta (Mertens) Reinbold
Canada, Northwest Territories, Stapylton Bay, Northwest Territories, Canada

Yale University Herbarium
Catalog #: YU.095566
Frits Johansen s.n. 10 June 1916
Enteromorpha torta (Mertens) Reinbold
Canada, Northwest Territories, Stapylton Bay

University Herbarium, University of California, Berkeley
Catalog #: UC1826777
Frits Johansen #2283 00 May 1915
Ulva Linnaeus, 1753
Canada, Stapylton Bay, North West Territory.

University Herbarium, University of California, Berkeley
Catalog #: UC1826779
Frits Johansen #2283 00 May 1915
Ulva Linnaeus, 1753
Canada, Stapylton Bay, North West Territory.

University of Michigan
Catalog #: 735029
Frits Johansen #s.n. 10 June 1916
Ulva prolifera O.F.Müller
Canada, Northwest Territories, Stapylton Bay

University of Michigan
Catalog #: 735047
Frits Johansen #s.n. 10 June 1916
Ulva prolifera O.F.Müller
Canada, Northwest Territories, Stapylton Bay

Michigan State University Algae
Catalog #: MSC0185197
Frits Johansen #s.n. 00 May 1915
Ulva torta (Mertens) Trevisan
Canada, Northwest Territories, Stapylton Bay

Miami University - Algae
Catalog #: 000210317
Frits Johansen #s.n. 00 May 1915
Ulva torta (Mertens) Trevisan
Canada, Northwest Territories, Stapylton Bay