Pneumatophore

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pneumatophore

[′nü·məd·ə‚fȯr]
(botany)
An air bladder in marsh plants.
A submerged or exposed erect root that functions in the respiration of certain marsh plants.
(invertebrate zoology)
The air sac of a siphonophore.

Pneumatophore

 

the organ of hydrostatic equilibrium in the colonial Siphonophora. The pneumatophore is located on the upper end of the common trunk of the colony. Its cavity is divided into air-bearing and glandular areas. The cells of the glandular area excrete a gas that is similar in composition to air.


Pneumatophore

 

a terrestrial ventilative or respiratory root of some tropical woody plants. Pneumatophores characterize many trees that form mangrove forests, some palms, and the American bald cypress. Such plants grow on swampy soils with a poor oxygen content or along seashores that are flooded when the tide is in. Pneumatophores develop from subterranean roots or rhizomes and grow vertically, rising above the water or soil. Their biological significance is mainly their supply of air to subterranean organs. This is promoted by the anatomic structure of pneumatophores: their thin bark, numerous lenticels, and system of air-bearing intercellular spaces. An abundance of intercellular space often is responsible for the white color of pneumatophores. Plants that usually have pneumatophores do not form them when grown on soils that are not swampy. Thus, pneumatophores are absent in the bald cypress that is raised as an ornamental on the southern coast of the Crimea, in the Caucasus, and in Middle Asia.

References in periodicals archive ?
Shrimp position within a habitat, whether they were utilizing the base of Spartina or Avicennia structure or clinging to leaves or pneumatophores, was also recorded.
secondary roots simple; pneumatophores present; shoot-borne roots
Short shoots pendent to horizontally spreading; leaves linear, 5-17 mm long, spreading, free portion contracted and basally twisted; pneumatophores with acute apex.
Pneumatophores were first described in 1660, but their function was not shown experimentally until 1955.
glomerata is the dominant species on rocky intertidal shores, forming patches of 90-100% cover, and is also abundant in mangrove forests, where it attaches to the pneumatophores (peg roots) and trunks of mangrove trees, forming dense aggregations (Chapman & Underwood 1995, Bishop et al.
Black mangroves (Avicennia germinans) typically grow a few feet farther from the water's edge, surrounded by hundreds of cigar-like "breathing tubes" called pneumatophores.
A comparison of lipid components of the fresh and dead leaves and pneumatophores of the mangrove Avicennia marina.
Primary root persistent; secondary roots branched; pneumatophores present; shootborne roots present; collar roots present.
Many of these gelatinous organisms form dense populations, especially the physonectid siphonophores, which have gas in their pneumatophores, and their distribution in the deep sea coincides with what is called the deep scattering layer (DSL).
Other species, such as Sonneratia alba, also develop pneumatophores which allow gas exchange, so ventilating the buried portion of the roots.
Some trees growing on wet sites develop what is called cypress "knees," which are really pneumatophores.