Migula, Krypt. Germ., Austr. Helv. Exs. [Algen]
Migula, E.F.A.W. [1 - 300]

Drexel University, Academy of Natural Sciences
Catalog #: PH00348469
W. Migula #148 00 May 1906
Spirogyra dubia Kützing
Germany, Eisenach

Miami University
Catalog #: 000163856
W. Migula #s.n. 00 May 1906
Spirogyra dubia Kützing
Germany, Eisenach

University of Michigan
Catalog #: 736628
W. Migula #s.n. 00 May 1906
Spirogyra dubia Kützing
Germany, Eisenach

Michigan State University
Catalog #: MSC0184760
W. Migula #s.n. 00 May 1906
Spirogyra dubia var. genuina
Germany, Knopfelsteiche, Eisenach

Drexel University, Academy of Natural Sciences
Catalog #: PH00147783
W. Migula #s.n. 00 May 1906
Spirogyra dubia Kützing
Germany, Eisenach