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The dermal layer consists of two parts. The epidermis is a one-cell thick, skinlike tissue that covers the entire plant. In woody plants, this tissue is stiffer and more corky. The epidermis secretes a waxy substance that coats the outside of the leaf, the cuticle. Tiny openings, called stomata, dot the surface of the leaf. The stomata open and close to release water and gasses from the plant.
In botany, plant cuticles are protective, hydrophobic, waxy coverings produced by the epidermal cells of leaves, young shoots and all other aerial plant organs.Cuticles minimize water loss and effectively reduce pathogen entry due to their waxy secretion.he cuticle both prevents plant surfaces from becoming wet and helps to prevent plants from drying out. Xerophytic plants such as cactus have very thick cuticles to help them survive in their arid climates.