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Palisade cells are cells found within the mesophyll in leaves of dicotyledonous plants right below the upper epidermis and cuticle. The Palisade layer is on the top side of the leaf to collect as much sunlight as possible. They contain the largest number of chloroplasts per cell, which makes them the primary site of photosynthesis in the leaves of those plants that contain them, converting the energy in light to the chemical energy of carbohydrates. Their cylindrical shape allows a large amount of light to be absorbed by the chloroplasts. These cells are positioned near the top surfaces of the leaves, underneath the epidermis.
Beneath the palisade mesophyll are the spongy mesophyll cells, which also perform photosynthesis. They are irregularly-shaped cells that having many intercellular spaces that allow the passage of gases, such as the carbon dioxide needed for photosynthesis to take place.
Holt Science & Technology "Microorganisms, Fungi, and Plant", Holt, Rinehart and Winston
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