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 ?
En la laguna Huaroncocha (>3.17 bits.[ind..sup.-1]) es clara la presencia de aguas limpias, evidenciando una alta diversidad de especies por la presencia de varios filo como Bacillariophyta, Charophyta, Chlorophyta, Cyanobacteria, Euglenophyta y Ochrophyta.
Ultraestructure of the mature male gamete of Nitella hialina (Charales, Charophyta).
(Chrorophyta and Charophyta) share the same types of chlorophylls (a and b) and carotenoids (e.g., lutein, beta-carotene) with embryophytes and, associatedly, similar chloroplast structure and thylakoid arrangement (Van den Hock et al., 1995).
The work of collectors gathers information of the phyla: Cyanobacteria, Rhodophyta, Ochrophyta (including Phaeophyceae and Xanthophyceae), Bacillariophyta, Chlorophyta and Charophyta, the best represented being Bacillariophyta and Rhodophyta.
Floristica: Se registro un total de 89 especies en 30 transectos, de las cuales una era Charophyta, 10 Bryophyta, cinco Pteridophyta, 31 monocotiledoneas y 42 eucotiledoneas.
These species were distributed in 100 genera and 37 families (Appendix 1), representing a variety of taxonomic groups (Charophyta, Bryophyta, Pteridophyta, Basal Angiospermae and Angiospermae).
Lago Cuicocha: En el Lago Cuicocha existen las clases de macrofitas Bryophyta y Charophyta que crecen en profundidades de hasta 35 m, las plantas vasculares se encuentran hasta en 14 m.