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Hydathodes

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Hydathodes 

adaptations in plants for the excretion of tiny droplets of moisture (guttation).

Hydathodes serve for the passive exudation of surplus water through the epidermal pores under the effect of root pressure. They are found primarily in plants with weak transpiration that live in conditions of excessive soil moisture. The hydathodes are located on the apexes of the leaves or on the tips of the laminar denticles. In the majority of plants they are modified stomata whose guard cells never close. The pore is sometimes surrounded by ordinary epidermal cells. Some hydathodes are actively moisture-excreting glandulae.

O. N. CHISTIAKOVA
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The dryopteroid genera that have hydathodes are Didymochlaena (pers.
Megalastrum (Dryopteridaceae) in Brazil, Paraguay, and Uruguay by Moran, Robbin C.; Prado, Jefferson; Labiak, Paulo H. / American Fern Journal
Melpomene is characterized by having ventral root insertion, reddish brown clathrate scales with apical and sometimes also marginal gland-like cells, hydathodes without calcareous deposits, and is distinguished from other grammitid genera by having secondary metabolites with a distinctive sweet and spicy odor (Smith and Moran, 1992).
Melpomene anazalea, a new species of grammitid fern (Polypodiaceae) by Sundue, Michael; Lehnert, Marcus / American Fern Journal
1E, F), without hairs; proximal 1-7 segment pairs markedly smaller than subsequent segments, sometimes the lowermost 1-4 segment pairs auriculiform; stomata sometimes visible as rusty red dots; segment margins without hairs; hydathodes present (Fig.
Eleven new species in the grammitid fern genus Melpomene ... by Lehnert, Marcus / American Fern Journal
 
 
 
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