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The ground tissue of the leaf which is enclosed within the epidermis is called the mesophyll (from the Greek words mesos, in the middle, and phyllon, leaf). The mesophyll is usually specialized as a photosynthetic tissue. It is living, lacunose parenchyma containing chloroplasts. In many plants, particularly in dicotyledons of the mesomorphic type, the mesophyll is commonly differentiated into palisade and spongy parenchyma. The palisade tissue consists of cells elongated at right angles to the epidermis and arranged like a row of stakes. The spongy parenchyma appears less regular, and its name has reference to the conspicuous intercellular-space system permeating it. - Esau
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"Sometimes I have to remember that things are brought to me for a reason, either for my own lessons or for the benefit of others." Cynthetiq
"violence is no more or less real than non-violence." roachboy
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