List of the 16 forest understory herbs and ferns included in the study.

For each plant group, the species have been ranked according to decreasing occurrence frequencies within their native ranges in Peninsular Spain (expressed as percentages of occurrences in UTM cells of 10x10 km each covering the species’ native distributions in the study area). Native range sizes are also provided. Species nomenclature follows Tutin et al. [58].List of the 16 forest understory herbs and ferns included in the study.