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Cork, felts - plant tissue, found as a subelement in the covering tissue system, periderms (corkscrew). It is the second product of fellogen (cytoplasmic tissue) next to the felloderm.

Epiderma acts as a tissue covering the stem for several weeks to two years, depending on the plant species. After this time the protection function takes over the plug. It is formed by the differentiation of cells formed by the division of the fellogen. It consists of dead cells, closely adhering to each other, filled with air. The walls of these cells are thickened, sometimes woody. Between the primary and secondary walls there is a suberine. The plug protects the plant against water loss, frost, bacteria and microorganisms, is impermeable to water and air, gas exchange is possible thanks to the plugged in the plug. In cork tissue there are two types of cells. The first type is the thin-walled cells forming the light tissue, the second is the thick-walled cells filled with tannins and resins forming dark tissue. Both types of cells can occur in the plug of one plant. In addition, there are woody parenchymatic cells in the plug, transforming into sclerids. With these cells, the cork gets stiff.

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