The Herbarium of the Institute of Botany (international index BILAS) was established in 1948. At present, the Herbarium consists of: 1) the Herbarium of Vascular Plants of Lithuania (about 60,000 specimens), 2) the Herbarium Generale (about 6,000 specimens), 3) the Herbarium of Bryophytes of Lithuania (about 8,000 specimens), 4) the Collection of Macromycetes (about 25,000 specimens), 5) the Collection of Micromycetes (12,000 specimens), 6) the Collection of Myxomycota (about 4,000 specimens), and 7) the Collection of Lichens and Lichenicolous Fungi (about 8,000 specimens). The main specialized collections: Herbarium Lithuaniae (60,000 herbarium sheets), Herbarium Generale (6,000), and Herbarium Professoris P. Snarskis (12,000).
The data on vascular plant collections are digitized (background database – programme BRAHMS), and researchers can use advanced microscopy and imaging documentation software.
Herbarium specimens are stored in climate-controlled rooms where protection against pests and mechanical effects is also ensured.
The Herbarium of the Institute of Botany is a constituent part of the Joint Nature Research Centre Open Access Centre, which provides the following services to State and private institutions: insertion and storage of herbarium specimens; preparation and admission of plant and fungal specimens, which have been used as R&D objects, for a long-term storage; provision of information about the stored specimens; and pursuance of exchanges with herbaria from other countries.