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

Brown University - Algae
Catalog #: ABRU00004482
N. L. Gardner s.n. 21 June 1906
Scytonema hofmannii C.Agardh ex Bornet & Flahault
United States, California, Marin, Mount Tamalpais, CA

Michigan State University Algae
Catalog #: MSC0184651
N.L. Gardner #s.n. 14 July 1906
Scytonema hofmannii C.Agardh ex Bornet & Flahault
United States, California, Marin, Mount Tamalpais

Miami University - Algae
Catalog #: 000210563
N.L. Gardner #s.n.
Scytonema hofmannii C.Agardh ex Bornet & Flahault
United States, California, Marin, Mount Tamalpais

Yale University Herbarium
Catalog #: YU.094953
Nathaniel Lyon Gardner s.n. 21 June 1906
Scytonema hofmannii C.Agardh ex Bornet & Flahault
United States, California, Marin, Mount Tamalpais, CA