in Transpiration and Guttation by

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The diffusion of the water vapor from the substomatal space into the atmosphere where it diffuses out through the substomatal space and exit the leaf through the stomatal pore is known as the stomatal transpiration. 90 to 95 percentage of the transpiration occurs through the stomata rest 5-10 percent occurs through the cuticle so known as the cuticular transpiration. Even though the cuticle is impermeable to water certain amount transpiration occurs through the cuticle. The cuticular transpiration is more significant in the leaves with thin cuticle. The dry conditions can be overcome by closing the stomata there by reducing the stomatal transpiration.