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A water-excreting microscopic epidermal structure in many plants.

[Greek hudōr, hudat-, water; see wed-1 in the Appendix of Indo-European roots + hodos, way, road.]


(Botany) a pore in plants, esp on the leaves, specialized for excreting water
[C19: from Greek, from hudor water + hodos way]


(ˈhaɪ dəˌθoʊd)

a specialized leaf structure through which water is exuded.
[< German Hydathode (1894) < Greek hydat-, s. of hýdōr water + hodós way, path; compare -ode2]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hydathode - a pore that exudes water on the surface or margin of a leaf of higher plants
stoma, stomate, pore - a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
References in periodicals archive ?
When the aerial stomata are close from morning to the evening, the absorption of materials are doing through the hydathode and cuticle.
1 mm wide, spherical, shiny, yellowish to orangish clear, sessile to stalked; basal basiscopic segment of pinnules becoming decurrent and adnate to the pinna rachises, the vein supplying the segment springing from the pinna rachis instead of the costule; hydathodes present or (more rarely) absent; indusia absent or (less commonly) present, circular, brown, firm, attached at the base of a sinus, in some species minute and fugacious; spores monolete, nongreen, the perispores cristate or spiny, non-fenestrate or rarely so (2 species); x=41 (Kramer and Green 1990).
2007); (5) type of rhizome (RT), 1 = erect or decumbent, 2 = short, stout, compact, 3 = short, horizontal or ascending, 4 = short-creeping, horizontal, 5 = long-creeping, horizontal; determined by field observations and species descriptions of Mickel and Smith (2004); (6) leaf morphology (LM), classifying the leaf as 1 = monomorphic or 2 = dimorphic; (7) leaf thickness (LT); 1 = thin, 2 = medium or 3 = thick; (8) indusium (IN), classified as 1 = present, 2 = absent, and (9) hydathodes (HY) classified as 1 = present or 2 = absent for each specimen (Kluge and Kessler, 2007).
leaf such at trichome bases, stomatal openings, hydathodes (structures
Silwet L-77 greatly reduces the surface tension of water, allowing it to infiltrate plant leaf stomata (Neumann & Prinz 1974) and hydathodes (Zidack et al.
Salt glands in grasses were first mentioned as such in the halophytic genus Spartina (Skelding & Winterbotham, 1939), but they had been previously described as hydathodes that secreted salt by Sutherland and Eastwood (1916).
To provide a useful framework for future monographic treatments, Mickel and Atehortua (1980) proposed an infrageneric classification based on morphological characters of the sporophytes and spores, including such characters as rhizome habit, phyllopodia, blade scales, presence versus absence of hydathodes, and perispore morphology.
Equisetum species, like many other plants, have hydathodes (Johnson, 1936).
The other feature observed is the absence of hydathodes on the adaxial surface of the laminae, which strongly suggests that P.
excised leaves showed brown coloration in the hydathodes at 226
Haberlandt (1894) pointed out that hydathodes and their analogues may also absorb water from the atmosphere.
During a study on the genus Elaphoglossum for Brazil, we found a new species with subulate scales and hydathodes on the laminar margin, belonging to the "Subulate scales clade", sensu Skog et al.