A considerable number of plant samples in the general herbarium comes from Roeper and P. E. Kühlewein. Incidentally, further notable contemporary botanists are among those that contributed to the collection: C. F. Schulz (Stargard), Wallich, A. Braun, de Condolle, Weihe, Boissier & Heldreich, W. Schimper, Bergius, Reichenbach, Treviranus, and Griesbach. Unfortunately, a number of lichen samples and types from the Flörke collection have been lost over the years.
In the Mecklenburg Herbarium, there are many samples collected by E. H. L. Krause himself, as well as the Griewank herbarium and samples from other lesser known collectors. Additionally, the Herbarium Vivum Florae Megapolitanae from G. G. Detharding (1816) is present in this collection.
The Rostock University Herbarium contains around 85,000 samples from nearly 30,000 taxons, which are divided into the following groups: vascular plants (70,000), mosses (5000), algae (4500), lichens (3000), and a small sample of fungi.