hydathode

Specialized pore, or less commonly a hair, through which water is secreted by hydrostatic pressure from the interior of a plant leaf onto the surface. Hydathodes are found on many different plants and are usually situated around the leaf margin at vein endings. Each pore is surrounded by two crescent-shaped cells and resembles an open stoma, but the size of the opening cannot be varied as in a stoma. The process of water secretion through hydathodes is known as guttation.