Hydathodes

• Hydathodes are structures that discharge liquid water with various dissolved substances from the interior of the leaf to its surface (guttation)
• Hydathodes are usually located at leaf tips or margins
• Structure of Hydathodes:

  (1) Terminal tracheids of one to three vein endings

  (2) Epithem - composed of thin-walled, chloroplast deficient parenchyma cells located above or distal to the vein endings

  (3) Sheath - a continuation of the bundle sheath - that extends to the epidermis

  (4) Openings - called water pores, in the epidermis