Charophyta


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Charophyta

[kə′räf·əd·ə]
(botany)
A group of aquatic plants, ranging in size from a few inches to several feet in height, that live entirely submerged in water.

Charophyta

 

(also Charophyceae), a phylum of algae or, according to some classifications, a class of green algae. The plants reach 1 m in height and have lateral branches that depart in whorls from multicellular nodes. Each internode consists of one cell, which may become overgrown by a bark of narrow cells that grow upward and downward from the nodes. The cell membranes are sometimes calcified. The lower parts, which are submerged in mud or sand, are colorless and have rhizoids. Vegetative reproduction occurs from various parts of the algae and from unicellular or multicellular tubercles formed on shoots in the ground. Asexual reproduction by spores is absent. The organs of sexual reproduction are multicellular: the oogoniums (spore buds), with one egg cell, and the antheridia. Fertilization occurs on the maternal plant; meiosis occurs when the oogonium sprouts, with three nuclei out of four being destroyed.

There are 300 species, making up six genera. The USSR has 45 species. The algae grow in freshwaters and in areas of seas with decreased salinity. They have the property of softening hard water. Charophyta are known in fossil form from the Devonian.

References in periodicals archive ?
Tambien colecto algunas Charophyta de Baja California y Baja California Sur en 1883.
Botanico norteamericano de Madison y colector incidental de algas Charophyta en la Laguna de Zempoala y Nuevo Leon en 1950; los ejemplares correspondientes se encuentran en MEXU.
Botanico norteamericano dedicado al estudio de los agaves, que ocasionalmente recogio un ejemplar de Charophyta en 1950; el especimen se encuentra en MEXU.
Schlumberger, entre ellas algas marinas y dulceacuicolas de los phyla Cyanobacteria, Rhodophyta, Chlorophyta y Charophyta, de Orizaba, Rio Blanco y Borrego, Veracruz (Hemsley, 1891; Barnhart, 1965).
Entre 1891 y 1896 obtuvo muestras de algas del phylum Charophyta de Durango y Baja California Sur, que se encuentran depositadas en NY y US.
Tambien recogio varios especimenes de Charophyta en Coahuila, Chihuahua, Distrito Federal (Tlalnepantla), Guanajuato, San Luis Potosi y norte de Mexico entre 1888 y 1906.
Obtuvo algunos ejemplares de Charophyta de Veracruz en 1913.
Las especies de Charophyta prefieren condiciones oligotroficas, pero algunas especies pueden tolerar condiciones eutroficas y desaparecen cuando hay concentraciones altas de nutrientes, por eso pueden servir como bioindicadores.