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

University of North Carolina at Chapel Hill Herbarium; Max & Fran Hommersand Algae Herbarium: Algae
Catalog #: NCU-A-0030818
Johnson, Walter #P.B.-A. 2230 04 October 1916
Enteromorpha intestinalis f. tenuis F.S.Collins
United States, Colorado, Weld, Still water along the shore of the Cache la Poudre River, Greeley, Colorado

Brown University - Algae
Catalog #: ABRU00005032
W. Johnson s.n. 04 October 1916
Enteromorpha intestinalis f. tenuis F.S.Collins
United States, Colorado, Cache la Poudre River, Greeley, CO

Yale University Herbarium
Catalog #: YU.095504
Walter Johnson s.n. 04 October 1916
Enteromorpha intestinalis (Linnaeus) Nees
United States, Colorado, Greeley; Cache la Poudre River, Greeley, CO

University of Michigan
Catalog #: 734544
Walter Johnson #s.n. 04 October 1916
Ulva intestinalis Linnaeus
United States, Colorado, Weld, Cache la Poudre River, Greeley, Colorado

University of Michigan
Catalog #: 734566
Walter Johnson #s.n. 04 October 1916
Ulva intestinalis Linnaeus
United States, Colorado, Weld, Cache la Poudre River, Greeley, Colorado

Michigan State University Algae
Catalog #: MSC0185171
Walter Johnson #s.n. 04 October 1916
Ulva intestinalis Linnaeus
United States, Colorado, Weld, Shore of Cache la Poudre river, Greeley

Miami University - Algae
Catalog #: 000210261
Walter Johnson #s.n.
Ulva intestinalis Linnaeus
United States, Colorado, Weld, Shore of Cache la Poudre river, Greeley