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M. R. Silva and S. Rosário, “Lycophytes and Monilophytes (Pteridophytes) of the Floresta Nacional de Caxiuanã, Pará State, Brazil: key to the families, and to species of Aspleniaceae and Blechnaceae”, bcnaturais, vol. 3, no. 2, pp. 151-163, Aug. 2008.