Abstract
AbstractFor over a century the relationships of the rare fern genus Adenoderris J. Sm. have been confused. Here, we (1) present a molecular analysis of the genus based on multiple chloroplast markers with the goal of placing its species phylogenetically, (2) provide insights into its morphology and complex taxonomy, and (3) make relevant nomenclatural changes. In seeking a resolution of the problems with Adenoderris, we investigated the morphological, historical, ecological, and biogeographical factors that have made Adenoderris so difficult to place with certainty. The key findings are that (1) Adenoderris comprises two species that were included in the genus on the basis of convergent and symplesiomorphic morphological features, and (2) though the two species both lie in the Dryopteridaceae, they belong to different genera. The correct names for these two species are Polystichum glandulosum C. Presl and Dryopteris sororia (Maxon) M. McHenry, Sundue & Barrington, comb. nov.
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