Willem Frederik Reinier
Suringar

Leiden (Chemistry Tree)


Hugo
de Vries

Amsterdam (Evolution Tree)


Hermann
Schacht

Rheinische Friedrich-Wilhelms-Universität Bonn (Systematics Tree)


Ernst Heinrich
Haeckel

Universität Jena (Neurotree)


Nathanael
Pringsheim

University of Jena


Eduard Adolf
Strasburger

Rheinische Friedrich-Wilhelms-Universität Bonn




Arend Joan Petrus
Oort

Wageningen University


Wilhelm Friedrich Philipp
Pfeffer

Universität Leipzig (Systematics Tree)


George Edward
Stone

Massachusetts Agricultural College (Plant Biology Tree)


Ralph Eliot
Smith

UC Berkeley (Plant Biology Tree)


Peter Alexander
Ark

UC Berkeley (Plant Biology Tree)

Johan
Dekker

Wageningen University
(Options)

Pierre J.G.M.
de Wit

Wageningen University

Johan DekkerX