in Anatomy of Flowering Plants by

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Parenchyma is the is the most common type of tissue which simple and unspecialized. It is distributed all over the different parts of the plant mainly in the softer portions of the parts of the plant body. It is found in the cortex, pith and pericycle of stem, root and leaves, in the fruits and seeds. It is also found in the complex tissue xylem and phloem. The parenchyma is usually isodiametric and vary in shape. They are closely packed with small inter cellular space whereas the storage parenchyma cells are with large inter cellular space. The cell wall of the parenchyma cells is composed of cellulose, calcium pectate and hemicellulose. The parenchyma is one of the important tissue which carries out different functions. The parenchyma cells of medullary rays help in the lateral conduction of water. These cells are important sites of photosynthesis, assimilation, respiration, storage etc. It retain the power of celldivision so it is helpful in the wound healing process.