hydathoden.

1895 Jrnl. Royal Microsc. Soc. 333 Under the name hydathode, Prof. G. Haberlandt designates those organs, which are frequently found in the leaves of tropical and other plants, especially designed for the storing up or excretion of water.

1895 Jrnl. Royal Microsc. Soc. 333 A very simple type of hydathode occurs in the leaves of grasses.

1897 J. C. Willis Man. Flowering Plants I. 116 Water-pores or hydathodes are openings, resembling stomata, upon leaves or elsewhere, through which the plant excretes water.

1902 A. G. Tansley in Encycl. Brit. XXV. 411/2 Some hydathodes are active glands, secreting the water they expel from the leaf.

1914 M. Drummond tr. G. Haberlandt Physiol. Plant Anat. x. 487 Many of our native plants are provided with organs which secrete water in the liquid form. Such hydathodes are even more widely distributed among plants inhabiting the humid tropics.

1931 E. C. Miller Plant Physiol. vii. 390 The physiological significance of the hydathodes and of the loss of water by guttation is not definitely known.

1953 K. Esau Plant Anat. xvi. 433 Hydathodes are structures that discharge water from the interior of the leaf to its surface.

1967 C. D. Sculthorpe Biol. Aquatic Vasc. Plants iv. 90 The possibility remains that the hydathodes [of water plants] are functionless relict structures.