Carneiro Leao Barros, Iva, Márcio Roberto Pietrobom-Silva, George Sydney Baracho, Jose Alves de Siqueira, Vaneicia Gomes dos Santos, and Alfredo Matos Moura. 2000. “Contribution to the Study of Pteridophytes of the Serra Do Urubú, Maraial Municipality, Pernambuco State, Northeastern Brazil (Marattiaceae-Vittariaceae)”. Anales Del Jardín Botánico De Madrid 58 (2):303-10. https://doi.org/10.3989/ajbm.2000.v58.i2.158.