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

Brown University - Algae
Catalog #: ABRU00003208
I. Holden s.n. 25 December 1898
Ectocarpus confervoides var. brumalis Holden
United States, Connecticut, Charles Island, near Milford, CT

Field Museum of Natural History
Catalog #: C0519267F
I. Holden #s.n. 25 December 1898
Ectocarpus confervoides var. brumalis Holden
United States, Connecticut, New Haven, Charles Island, near Milford

Yale University Herbarium
Catalog #: YU.091659
Isaac Holden s.n. 25 December 1898
Ectocarpus confervoides Le Jolis
United States, Connecticut, New Haven, Milford; Charles Island, Milford, CT

University of Michigan
Catalog #: 634945
Isaac Holden #s.n. 25 December 1898
Ectocarpus confervoides var. brumalis Holden
United States, Connecticut, New Haven, Charles Island, near Milford

University of Michigan
Catalog #: 634947
Isaac Holden #s.n. 25 December 1898
Ectocarpus confervoides var. brumalis Holden
United States, Connecticut, New Haven, Charles Island, near Milford

Michigan State University Algae
Catalog #: MSC0182524
Isaac Holden #s.n. 25 December 1898
Ectocarpus conervoides f. brumalis Holden
United States, Connecticut, New Haven, Charles Island, near Milford

Miami University - Algae
Catalog #: 000187114
Isaac Holden #s.n. 25 December 1898
Ectocarpus confervoides var. mamillosa
United States, Connecticut, New Haven, Charles Island, near Milford