Countless expeditions and active loan and exchange programmes with other herbaria, have led to the vast and varied collection held here in the Department of Botany. Even today, numerous new specimens are collected and exchanged yearly.
In order to work work with the valuable material held in W, botanists from all over the world come to visit the Department of Botany or request specimens on loan. When it is impossible to physically send specimens (i.e. due to fragile or rare herbarium sheets), it is possible to find the requested specimen on the virtual herbaria website. This database contains numerous specimens, including scans of type specimens. Photographs of plants of the Austrian Flora can be found at Botanik-im-Bild.