The Xanthophyta or Heterokontae are commonly known as yellow-green algae include only one class Xanthophyceae. This division has close relationship with. Xanthophyta (yellow-green algae) A division of algae in which the chloroplasts are yellow-green and which form motile cells with 1 long, forward-directed tinsel. Xanthophyta: Xanthophyta, division or phylum of algae commonly known as yellow-green algae.
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Fritsch recognizes the following orders in the class Xanthophyceae: It comprises a single species,….
Yellow-green Algae |
Wikispecies has information related to Xanthophyceae. You can learn more about this topic in the related articles below. The protoplast of the sporangium may also divide to form many small immobile thin-walled aplanospores. In some terrestrial species, if exposed to greater desiccation, the threads become septate and rows of cysts are formed giving rise to what is termed Gongrosira stage Fig.
Coenocytes are organized as a single-cell multinucleated thallus that form long filaments without septa internal division walls except in the specialized structures of some species.
Sexual reproduction is oogamous. Any text you add should be original, not copied from other sources.
Xanthophyta The yellow- green algae are photosynthetic species of organisms belonging to the Xanthophyta Phylum, which is one of the phyla pertaining to the Chromista Group in the Protista Kingdom. The protoplasmic vacuole diminishes in size as a result of which the protoplasm appears deep green in colour.
Retrieved from ” https: Immotile unicellular forms can usually convert readily to xanthophyfa flagellated motile form. Your contribution may be further edited by our staff, and its publication is subject to our final approval. Vegetative reproduction is by accidental breaking of the vegetative body.
Plants are dioecious or monoecious. Some species are unicellular organisms equipped with two unequal flagella that live as free-swimming individuals, but most species are filamentous. The rhizoidal portion may be profusely or sparsely branched and has dense or vacuolated cytoplasm with many nuclei without plastids.
Filamentous species may be either siphonous or coenocytic. The oogonium bears single large, uninucleate oosphere, while the antheridium gives rise to numerous small biflagellate sperms bearing unequal flagella. Examples of xanthophytes repair the unequal flagella in the cells. The protoplasm divides into innumerable uninucleate protoplasts. Xanthophytes occur in a variety of forms — unicellular, colonial, filamentous, and siphonaceous; motile cells have two unequal-sized undulipodia flagella.
At the bottom of the article, feel free to list any sources that support your changes, so that we can fully understand their context. Wikipedia articles needing page number citations from Xannthophyta Articles with ‘species’ microformats All articles with unsourced statements Articles with unsourced statements from December At maturity, divisiion small male gametes, or antherozoids are formed.
In spite of his own dislikeness, Fritsch placed Vaucheria in the family Vaucheriaceae under the order Siphonales belonging to the Chlorophyceae. Here’s how it works: Xanthophyceae Allorge, emend. Views Read Edit View history. Heterogloeales Ochromonadales Rhizochloridales Synurales.
Chromulinales Chrysosphaerales Hibberdiales Hydrurales Phaeothamniales. Yellow-green algae or the Xanthophyceae xanthophytes are an important group of heterokont algae. It is likely, however, that meiosis is zygotic and hence the vegetative filament is haploid Xanthophhta.
Learn more about citation styles Citation styles Encyclopedia. Food reserve is oil. Whereas, the aquatic species occur in shallow fresh-water streams, while there are a few marine species.
The aerial vesicular or lobed portion is covered with a relatively tough wall chiefly of cellulose, within which there is a thin, peripheral layer of cytoplasm containing many nuclei; lenticular or fusiform plastids; oil droplets; and leucosin granules.