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 ?
The model pneumatophores were transported to the laboratory for inspection under a dissecting microscope.
Within the mangrove forest, the factor plot was nested within tidal elevation only, with 5 replicate pneumatophores of each treatment per plot.
The exception was on the high shore after recruitment episode 1, when bare pneumatophore mimics supported fewer oysters per unit area than pneumatophores with a shell or oyster.
Tr, substrate treatment (3 levels: P, pneumatophore; O, pneumatophore + oyster; S, pneumatophore + shell); Ti, tidal elevation (3 levels: L, low; M, mid; H, high); Pl, plots (3 levels, random) with n = 5 replicate pneumatophores within each; SNK, Student-Newman-Keuls tests.
distinct pneumatophores at base; shoot-borne roots absent.
disk collar not swollen; secondary roots simple; pneumatophores present;
collar present; secondary roots branched; pneumatophores present;
not distinct; secondary roots simple, short; pneumatophores present;
abundant; secondary roots stout, branched; pneumatophores present;
Short shoots ascending; leaves lanceolate, 3-10 mm long, appressed and overlapping, free portion not contracted and basally twisted; pneumatophores with obtuse apex.
Primary root persistent; secondary roots branched; shoot-borne roots present; pneumatophores present; collar roots and root hairs absent.