The herbarium of the University of Graz (official abbreviation: GZU) is one of the most important botanical collections in Europe, with approximately 1,200,000 specimens from all over the world. The herbarium material includes vascular plants, bryophytes, fungi, lichenized fungi, myxomycetes, algae, and cyanobacteria. Approximately 10,000 type specimens are currently stored in GZU. The lichen collection, founded by Prof. Dr. Josef Poelt, with at least 220,000 specimens, is of particular international importance.