Anatomy and histochemistry of Utricularia nelumbifolia stolons. (A, B) General stolon anatomy. Note the parenchymatous cortex (Pc), which surrounds the ectophloic central cylinder (CC). pf, phloem; x, xylem; La, lacunae. Scale bar = 100 µm. (C) Autofluorescence of tissues under UV light. Pc, parenchymatous cortex; CC, central cylinder (CC). xylem. Arrow indicates xylem. Scale bar = 100 µm. (D) Negative reaction for lipids (Sudan III). Scale bar = 100 µm. (E) Reaction for lipids (Sudan IV). Note the positive reaction in cuticle of epidermal cells and the barrier cell of the trichome. tc, terminal cell; bc, basal cell. Arrow indicates a barrier cell. Scale bar = 50 µm. (F) Section after IKI treatment. Note the lack of starch grains. Scale bar = 100 µm.