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

Brown University - Algae
Catalog #: ABRU00005092
A. P. D. Piguet s.n.
Volvox perglobator J.H.Powers
United States, Massachusetts, Back Bay Fens, near Art Museum, Boston, MA

University Herbarium, University of California, Berkeley
Catalog #: UC1828934
A. P. D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near Art Museum, Boston

University Herbarium, University of California, Berkeley
Catalog #: UC1828935
A. P. D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near art museum, Boston

University of Michigan
Catalog #: 735903
A.P.D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near art museum, Boston

University of Michigan
Catalog #: 735904
A.P.D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near art museum, Boston

Michigan State University Algae
Catalog #: MSC0185259
A.P.D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near Art Museum, Boston

Miami University - Algae
Catalog #: 000210311
A.P.D. Piguet #s.n. 00 August 1917
Volvox perglobator J.H.Powers
United States, Massachusetts, Suffolk, Back Bay Fens, near Art Museum, Boston

Yale University Herbarium
Catalog #: YU.095560
Adolphe Pierre David Piguet s.n.
Volvox perglobator J.H.Powers
United States, Massachusetts, Boston; Back Bay Fens, near Art Museum, Boston, MA