It includes ca. With respect to the cryptogams, these are mainly ferns and bryophytes. H.C. Focke, S.R. Gradstein, F.W. Hostmann, A. Kappler, K.U. Kramer, J. Lanjouw, F.A.W. Miquel, F.H.F. Oldenburger, A.A. Pulle, F. Ritter, H.J.M. Sipman, A.L. Stoffers, J.G. Wessels Boer. There are rich Guianan collections by a.o. During the last two decades, various collectors brought in ca.
Exchange is available from tropical America, and is wanted from tropical America.
There are ca. Within the scope of this project, of more than 7000 Utrecht type specimens a digitised image was prepared by ETI . This database has been made available for access via internet, and is also available on CD-Rom. For details, and to have a view at a specimen, the reader is referred to the site of the NHN-Leiden .