Almeida, F. C., M. R. Pietrobom, and R. S. Fernandes. “Lycophytes of the Chapada Das Mesas National Park, Cerrado, Maranhão, Brazil”. Biota Neotropica, vol. 20, no. 3, Jan. 2020, //www.biotaneotropica.org.br/BN/article/view/1739.