Figure 2 from: Zuquim G, Tuomisto H, Prado J (2017) A free-access online key to identify Amazonian ferns. PhytoKeys 78: 1-15. https://doi.org/10.3897/phytokeys.78.11370

Figure 2 - Structure of the key under development in LucidBuilder. Screenshots of the key been developed in Lucid Builder V3.5. A spreadsheet scoring table view B tree view mode of the scores for a single species C an example of features positive relationship: the plus sign associated with "number of included free veinlets" and "orientation of included free veinlets" shows that these features are controlled by the highlighted state ("usually present" under "included free veinlets"). All controlling states for some feature in the key are marked in red D frequency plot of the number of differences among pairs of entities and a list of those entities that have at most 10 different scores among them.