1. Plant Biomechanics Group, Botanic Garden, Faculty of Biology, University of Freiburg, Schänzlestraße 1, 79104 Freiburg, Germany
2. Evolutionary Biomaterials Group, Department of Thin Films and Biological Systems, Max Planck Institute for Metals Research, Heisenbergstraße 3, 70569 Stuttgart, Germany
3. Functional Morphology and Biomechanics, Zoological Institute, Christian Albrechts University of Kiel, Am Botanischen Garten 1-9, 24108 Kiel, Germany