The Faculty of Science has two oldest and largest collections of bryophytes, ferns and seed plants in Croatia. The Herbarium Croaticum (ZA) collection holds an estimated 230,000 specimens that have been collected throughout Croatia and around the world over the past 200 years. The Herbarium Ivo and Marija Horvat (ZAHO) has 71,611 herbarium specimens collected in Croatia and the Balkan Peninsula.
- Permanently preserve plant material for reference and research
- Provide material and information for the study of plant diversity
- Spread the importance of plant diversity