FIGURE 4. Interactive identification key. A in Enabling comparisons of characters using an Xper2 based knowledge-base of fern morphology

FIGURE 4. Interactive identification key. A: List of descriptors sorted according to their discriminant power. B: Definition of the selected descriptor. C: List of states for the selected descriptor. D: Illustration of the different descriptor states. E: List of the discarded taxa during the process of identification. F: List of the remaining taxa, still candidate to be identified. G: Identified taxon displayed at the end of the identification process.