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The reason that we used PACo is that it was difficult to construct sensible phylogenies because the taxonomy of these lichen symbionts was problematic; based on the data we had it was not clear morphologically or phylogenetically how many fungal and algal taxa we are dealing with. Most event-based codivergence analyses require phylogenetic trees as input. However, with more phylogenetic data, a comparison of event-based methods with PACo is something that we could look at in the future to calibrate our PACo approach.

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