Arana, M. D.; Reinoso, H.; Oggero, A. J. Morphology and Anatomy of Caulinar Axes, Lycophylls and Sporangia of Phlegmariurus Phylicifolius: A Contribution to the Systematics of Neotropical Lycopodiaceae. Rev. Biol. Trop. 2014, 62, 1217–1227.