Morphometric parameters analysed in Wittrockia cyathiformis. A. Area of the leaf sheath for making 3 cm2 sections to evaluate absorptive peltate trichomes. B. Leaf blade length. C. Leaf sheath length. D. Length of the fourth spine at the base of the leaf blade. E. Width of the apex of the leaf blade. F. Width at the midpoint of the leaf blade. G. Width of the fully extended leaf sheath. The highlighted leaf in the figure shows its removal from the median region of the leaf rosette, which was detached from the bromeliad for evaluation of the morphometric parameters illustrated on the right.