in Anatomy of Flowering Plants by

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The lenticels are pore like openings which are somewhat raised spots seen on the surface of the stem which is lens shaped. It is most common in the woody plants where periderm is formed. The secondary growth result in the formation of periderm; of this the cork cells are impervious to water and gases. So the gaseous exchange between the internal cell and external atmosphere.

The stomata is the narrow opening found in the epidermis of leaves. This pore remains surrounded by the specialized epidermal cells called as guard cells. The epidermal cells surrounding the guard cells are specialized and is known as the subsidiary cells or accessory cells.

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