Jacob
Vallan

Utrecht






Johannes
de Gorter

University of Harderwijk




Johann C. D.
von Schreber

University of Erlangen

Carl F. P.
von Martius

University of Munich
(Options)


Henry Augustus
Ward

Ward's Natural Science Establishment

Charles Otis
Whitman

Chicago (Evolution Tree)

Albert John
Cook

Pomona College (Terrestrial Ecology Tree)

Alexander
Agassiz

Harvard (Chemistry Tree)


Burt G.
Wilder

Cornell (DevTree)

Edward A.
Birge

UW Madison

Alpheus
Hyatt

(Systematics Tree)


Carl von MartiusX