a pore that exudes water on the surface or margin of a leaf of higher plants
water- or mineral-excreting pores at the ends of some veins, e.g. in Grammitidaceae and some Davalliaceae.
Structures (glands) usually on a leaf margin that secrete water (guttation) Parent Term: Surface_details Difficulty Level
In some taxa, such as Dryopteris, the veins end in raised, broadened tips, without reaching the margin of the blade segments. These "hydathodes" are often whitish in color, and better observed on the adaxial (upper) surface of the frond.
A specialized leaf structure with one or more openings through which water is discharged from the interior of the leaf to its surface. ()
A hydathode is a type of tissue in leaves, usually more advanced plant species, that permits the release of water through pores in the epidermis or margin of leaves. They probably evolved from modified stomata. It is involved in guttation, where water is released from the top in order to transport the nutrients in the water from the roots to the leaves.