The scientific collections of the CIF in Lourizán constitute a heritage of incalculable value that brings together a wide sample of Galicia's biodiversity. The center houses the LOU Herbarium, which has more than 85,000 vascular plant specimens, including the historic collection of Father Baltasar Merino (the basis for the Descriptive and Illustrated Flora of Galicia), as well as contributions from Manuel Laínz and Gómez Vigide. This collection is complemented by the LOU-Fungi Mycological Collection, with 25,000 specimens of fungi, and an insect collection housing more than 8,000 insects of different orders, all preserved in humidity and temperature-controlled systems to ensure their scientific integrity.
Access to these collections is strictly restricted to research staff, technicians, and specialists belonging to scientific institutions who can justify a specific study objective. Unlike the Botanical Garden, the herbarium and its associated collections are not open to the general public in order to preserve the safety of the specimens. The center offers on-site consultation and sheet loan services.