The ferns and lycophytes of Reserva Natural Guaricica, Antonina, Paraná, Brazil Matos, Fernando B. Bohn, Amabily Labiak, Paulo H. Check List 2020 2020-02-21 16 1 183 206 4WBSF Spring Spring [171,481,1446,1471] Lycopodiopsida Selaginellaceae Selaginella Plantae Selaginellales 10 193 Tracheophyta species flexuosa   Figures 3B, 4C   Examined material.  BRAZIL• 3 specimens; Trilha do Gervásio; 25°14′39″S, 048°39′59″W; alt.  50 m;  21 Dec. 2004; F.B. Matos& P.H. Labiak166 leg.; CEPEC122125, MBM333141, RB691218•  1 specimen; Morrodo Quei- mado; 25°23′10″S, 048°42′19″W; alt.  300 m;  12 Jun. 2019; F.B. Matoset al. 2638 leg.; UPCB44416.  Identification.Characterized by dichotomous, usually prostrate, non-articulate stems with 4 ranks of leaves: two lateral rows of larger spreading leaves and two rows of appressed and ascending median leaves on upper side of stem. Sporangia globose, opening by a slit across the top, arranged in quadrangular strobili located terminally on axes. Plants heterosporous, the megaspores four per sporangium, white, the microspores numerous per sporangium, orange.  Sellaginella flexuosadiffers from other species of the genus in the area by oblong to elliptic lateral leaves, aristate median leaves, and a somewhat rugose texture of leaves adaxially.   Distribution and habitat.Neotropical. Terrestrial or rarely epiphytic in forests. Class Polypodiopsida Cronquist, Takht. & W.Zimm. RB691218 2004-12-21 F. B. Matos & P. H. Labiak Brazil 50 -25.244167 Trilha do Gervasio 21 -48.66639 10 193 3 2019-06-12 F. B. Matos Brazil 300 -25.38611 Morro 21 -48.70528 10 193 1