The botanical specimens (herbarium) come from the collection of the Herbarium of the Forest Research Institute in Białowieża. The collection includes unique herbarium materials with labels containing descriptions of plants. The collection includes herbarium sheets of plants collected in the Białowieża Forest and its surroundings. The oldest plant specimens in the collection date back to 1962. The botanical specimens collected on the RCIN platform were collected during previous fieldwork by IBL staff, mainly in the collections of Professor Aleksander W. Sokołowski.