de Azevedo C. F., da Silva K. R. G., Bruno R. L. A., Quirino Z. G. M., Morfoanatomia vegetativa de Opuntia brasiliensis (Willd) Haw., Ambiência, 2013, 9(1):73-82, doi: 10.5777/ambiencia.2013.01.05
The paper describes the anatomy of Brasiliopuntia brasiliensis under the old generic name Opuntia. It compares the root and different types of stem, including their stomata, parenchyma, mucilage cells and crystals.