The Herbarium Haussknecht (JE) houses about 3.5 Mio specimens from all parts of the world, especially vascular plants from central and southeast Europe, southwest Asia, and Cuba, and Bryophytes from tropical and subtropical regions . The most important collections include the original collections of C. Haussknecht, C. Gaillardot, T. Herzog (only bryophtyes), and T. Strauss, the original herbaria of C. Dufft, A. Georges, W. Gerhard, R. Grolle, E. Sagorski, and K. Schliephacke, as well as major collections of e.g., B. Balansa, C. I. Blanche, E. Boissier, J. Bornmüller, W. Rothmaler, P. Sintenis, F. K. Meyer, A. Schäfer-Verwimp, R. Düll, and the Flora de Cuba series.