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

Brown University - Algae
Catalog #: ABRU00005079
N. L. Gardner s.n.
Rivularia natans (Hedwig) S.F.Gray
United States, California, Lake Merced, San Francisco, CA

Michigan State University Algae
Catalog #: MSC0182813
N.L. Gardner #s.n. 00 November 1916
Gloeotrichia natans Rabenhorst ex Bornet & Flahault
United States, California, San Francisco, Lake Merced

Yale University Herbarium
Catalog #: YU.095545
Nathaniel Lyon Gardner s.n.
Rivularia natans (Hedwig) S.F.Gray
United States, California, San Francisco, San Francisco; Lake Merced, San Francisco, CA