Refer to this website
Slik, J.W.F. and P.C. van Welzen, 2004. Macaranga and Mallotus species of Borneo. Nationaal Herbarium Nederland, Leiden University, Leiden, The Netherlands: http://www.nationaalherbarium.nl/MacMalBorneo/index.htm

Photographs
Part of the Macaranga and Mallotus photographs have kindly been provided by Dr. Brigitte Fiala (Theodor-Boveri-Institut für Biowissenschaften, Biozentrum der Universität Würzburg, Lehrstuhl für Tierökologie und Tropenbiologie (Zoologie III), Germany) and Dr. Paul Kessler (Nationaal Herbarium Nederland, Leiden University Branch, The Netherlands).
 

Aknowledgements
We would like to thank the late T.C. Whitmore and his wife W.A. Whitmore for providing us with the draft version of their Macaranga monograph. Brigitte Fiala is acknowledged for carefully checking and commenting on the first drafts of the Macaranga and Mallotus key. The Expert Centre for Taxonomic Identification (ETI) is acknowledged for programming the 'Forest disturbance indicator method'. Funding for this website was provided by the 'European Network for Biodiversity Information (ENBI), Work package 13: Making non-European biodiversity data in European repositories globally available', and the 'Netherlands Biodiversity Information Facility' (NLBIF).