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.