The Herbarium collections of the Charles University, Prague (Index Herbariorum Acronym PRC) house more than 2,300,000 specimens of algae, bryophytes, fungi, lichens, seeds / fruits, and vascular plants. Due to its size, age (founded in 1775), geographical coverage and importance (tens of thousands of type specimens), the Herbarium collections PRC belong to the biggest and most important herbaria in the world housed by university institutions. The PRC dataset contains mostly continuously sorted type specimens, recent loans (both with images), and new accessions (often related to specific projects performed by students and staff of Department of Botany, Charles University), or newly acquired entire collections.