• Phelloderm consists of living cells with photosynthesizing chloroplasts and cellulosic walls. Cells that grow inwards from there are termed phelloderm, and cells that develop outwards are termed phellem or cork (note similarity with vascular cambium).The periderm thus consists of three different layers: The internal tissue formed by the phellogen is known as phelloderm, and consists usually of ordinary parenchyma. Phelloderm is the secondary cortex, which is formed on the inner side of phellogen. Phelloderm (Secondary cortex): It is formed on the inner side of phellogen. Because of the formation of cork, the tissues outside it usually die out. In the periderm, there are small, raised areas called lenticels. Consists of nonliving cells with suberized walls. Secondary cortex (phelloderm) consists of 12–18 layers having oval to polygonal, tangentially elongated thin-walled parenchymatous cells. The phelloderm consists of the single-layer of small, squarish and thick-walled cells, just inside the flattened phellogen cell layer, that contain living protoplasts (you can see the nucleus in many of these cells). Phelloderm: • It consists of cells that resemble parenchyma cells in the cortex. Synonyms for cork cambium are bark cambium, pericambium and phellogen.Phellogen is defined as the meristematic cell layer responsible for the development of the periderm. Bark, in woody plants, tissues external to the vascular cambium (the growth layer of the vascular cylinder); the term bark is also employed more popularly to refer to all tissues outside the wood.The inner soft bark, or bast, is produced by the vascular cambium; it consists of secondary phloem tissue whose innermost layer conveys food from the leaves to the rest of the plant. Phelloderm is a. thin layer of parenchyma cells that forms to the interior of the cork cambium. 0. Phelloderm consists of 1-4 layers of cells, the outer 1-2 rows of cells with lignified and thickened walls, forming an interrupted ring of cells containing prisms of calcium oxalate. Cells are loosely arranged with intercellular spaces. • The phelloderm cells are phellogen derivatives formed inward. Phloem rays a bit broad, slightly curved; fibre bundles scattered in phelloderm and phloem. 0. Cambium in a ring. Consists of living cells, parenchymatous in nature and does not have suberin. The extent of development of the phelloderm is dependent upon whether the phellogen has a superficial or a deep-seated origin. These areas consist of more spaces between cork cells, which enable gas exchange between inner live cells of woody stem or root with the outside air. Cork cell accumulate to the. The periderm consists of the phellogen or cork cambium, the meristem that produces the periderm; the cork or phellem, the protective tissue produced outside by the phellogen, and the inner cortex or phelloderm, the living parenchyma, formed inside by the phellogen. As it contains chloroplast, it synthesises and stores food. Lenticels are present. • The number of phelloderm layers varies with species, season, and age of the periderm. It includes three layers (starting from surface): phellem external layer of periderm, cork (cork), phellogen cork cambium, lateral meristem making periderm (cork cambium) and phelloderm internal layer of periderm (Figure \(\PageIndex{7}\)). ... phelloderm and cork cells. 1. The cork cambium, cork, and phelloderm collectively known as the periderm. consists of flattened blade, and a stalk called the petiole, which joins the leaf to a node of the stem. 1. 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