The lineage (, ) in the Neotropics: sp. nov. from pine-oak forests in Mexico.

, a potential medicinal species due to the presence of various lucidenic acids, was originally described from the southeastern United States. Controversy subsequently developed as it became clear that this was not a single species but a complex. In the present study, 39 collections from the complex, including 30 collections originating from four different states of Mexico and type specimens were analyzed from a phylogenetic, morphological, and ecological point of view. The phylogenetic relationships within the complex were analyzed using sequence data from ITS, , , and regions. A total of six clades were resolved within the complex, that corresponds to , , , , sp. from Costa Rica, and a clade comprising several collections previously named from Mexico, described here as Furthermore, is confirmed as a synonym of .