text: The major tissue systems present are
  * The epidermis, which covers the upper and lower surfaces
  * The mesophyll tissue, which consists of photosynthetic cells rich in chloroplasts. (also called chlorenchyma)
  * The arrangement of veins (the vascular tissue)
  These three tissue systems typically form a regular organization at the cellular scale. Specialized cells that differ markedly from surrounding cells, and which often synthesize specialized products such as crystals, are termed idioblasts.