Itatiaia National Park is located in Southeastern Brazil, between the states of Rio de Janeiro and Minas Gerais, with altitudes ranging from 390 to 2789 m (Pico das Agulhas Negras). Lycopodiaceae has four genera and approximately 500 species, with cosmopolitan distribution. It is a homosporous family characterized by eligulate leaves and sporophylls. The family is represented in the study area by 23 species and one variety, distributed in three genera (Huperzia, 15 species; Lycopodiella, four species and one variety; Lycopodium, four species), totaling 43% of the species recorded in Brazil and 72% in the state of Rio de Janeiro. Keys to the identification of the genera and species, illustrations, descriptions, notes on taxonomy and ecologicalcharacteristics, geographic distribution and altitudinal variation are presented.
Lycopodiaceae; Atlantic Forest; taxonomy
