María Gabriel y Galán, José, Carmen Prada, Cristina H. Rolleri, Rafael Lahoz-Beltrá, and Cristina Martínez-Calvo. 2011. “Biometry of Stomata in Blechnum Species (Blechnaceae) With Some Taxonomic and Ecological Implications for the Ferns”. Revista De Biología Tropical 59 (1):403–415. https://doi.org/10.15517/rbt.v59i1.3208.