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Zygnemataceae
The Zygnemataceae are a family of Algae#Morphology, filamentous or unicellular, uniseriate (unbranched) green algae. The filaments are septum, septated and reproduction is by Sexual conjugation, conjugation; ''Spirogyra'' is commonly used in schools to demonstrate this kind of reproduction. The family is notable for its diversely shaped chloroplasts, such as Star, stellate in ''Zygnema'', Helix, helical in ''Spirogyra'', and flat in ''Mougeotia''. The Zygnemataceae are cosmopolitan, but though all generally occur in the same types of habitats, ''Mougeotia'', ''Spirogyra'', and ''Zygnema'' are by far the most common; in one study across North America, 95% of the Zygnemataceae collected were in these three genera. Classification and identification is primarily by the morphology of the conjugation, which is somewhat rare to find in natural populations of permanent water bodies; when in the vegetative state, the rarer genera resemble the three most common, and are often mistaken for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spirogyra
''Spirogyra'' (common names include water silk, mermaid's tresses, and blanket weed) is a genus of filamentous charophyte green algae of the order Zygnematales, named for the helical or spiral arrangement of the chloroplasts that is characteristic of the genus. ''Spirogyra'' species, of which there are more than 500, are commonly found in freshwater habitats. ''Spirogyra'' measures approximately 10 to 150 micrometres in width (though not usually more than 60) and may grow to several centimetres in length. Distribution ''Spirogyra'' can be been found on every continent on Earth, including Antarctica. It is freshwater algae, found rivers, ponds, and other such bodies of water. Taxonomy The genus Spirogyra was named by German naturalist Johann Heinrich Friedrich Link in 1820. The lectotype, ''Spirogyra'' ''porticalis'' was designated in 1952 by Paul C. Silvia. Reproduction ''Spirogyra'' can reproduce both sexually and asexually. In vegetative reproduction, fragmentation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mougeotia
''Mougeotia'' is a genus of filamentous charophyte green algae of the order Zygnematales. It is a common component of freshwater aquatic habitats around the world. Described in 1824 by Carl Adolph Agardh, its name honors the French botanist Jean-Baptiste Mougeot. Description ''Mougeotia'' forms uniserial (one cell thick) chains of cells, called filaments, that are usually unbranched; in certain conditions, it forms branched filaments. Cells are cylindrical, many times longer than wide. Each cell has one or two flat, rectangular and ribbon-shaped chloroplasts that fill the cell. Chloroplasts are able to twist in response to light conditions. The nucleus is located at the center of the cell. Reproduction ''Mougeotia'' is able to reproduce sexually, through a process known as conjugation. It is isogamous, with two different but identically appearing gamete types. In scalariform conjugation, cells of two separate filaments line up parallel to one other. Cells of one filament connect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mougeotiopsis
''Mougeotiopsis'' is a monotypic genus of algae belonging to the family Zygnemataceae. It only contains one known species, ''Mougeotiopsis calospora'' Palla The genus name of ''Mougeotiopsis'' is in honour of Jean-Baptiste Mougeot (1776–1858), who was a French physician and botanist. The genus was circumscribed In geometry, a circumscribed circle for a set of points is a circle passing through each of them. Such a circle is said to ''circumscribe'' the points or a polygon formed from them; such a polygon is said to be ''inscribed'' in the circle. * Circum ... by Eduard Palla in Ber. Deutsch. Bot. Ges. vol.12 n pages 228, 234-235 in 1894. References {{Taxonbar, from1=Q104813549, from2=Q105440103 Zygnemataceae Charophyta genera Monotypic algae genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desmidiales
Desmidiales, commonly called the desmids (''Gr.'' ''desmos'', bond or chain), are an order in the Charophyta, a division of green algae in which the land plants ( Embryophyta) emerged. Desmids consist of single-celled (sometimes filamentous or colonial) microscopic green algae. Because desmids are highly symmetrical, attractive, and come in a diversity of forms, they are popular subjects for microscopists, both amateur and professional. The desmids belong to the class Zygnematophyceae. Although they are sometimes grouped together as a single family Desmidiaceae, most classifications recognize three to five families, usually within their own order, Desmidiales. The Desmidiales comprise around 40 genera and 5,000 to 6,000Brook, Alan J., 1981. ''The Biology of Desmids'', page 1. (Berkeley: University of California Press). species, found mostly but not exclusively in fresh water. In general, desmids prefer acidic waters (pH between 4.8 and 7.0), so many species may be found in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roya (alga)
{{disambiguation ...
Roya may refer to: * ''Roya'' (alga), a genus of green algae and a subgroup of Zygnemataceae * Roya (river), a river of France and Italy * Roya (gastropod), a synonym of ''Williamia'', a genus of small sea snails * Roya (given name), includes the list of notable people withe the name * Roya (singer), an Azerbaijani pop singer * Roya, Princess Samira’s pet peacock in the American animated television series ''Shimmer and Shine'' * Roya TV, a private Jordanian television station See also * Roia (other) * Royal (other) Royal may refer to: People * Royal (name), a list of people with either the surname or given name * A member of a royal family or royalty Places United States * Royal, Arkansas, an unincorporated community * Royal, Illinois, a village * R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zygnema
''Zygnema'' is a genus of freshwater filamentous thalloid alga comprising about 100 species. A terrestrial species, ''Z. terrestre'', is known from India. ''Zygnema'' grows as a free-floating mass of filaments, although young plants may be found anchored to streambeds with a holdfast. The filaments form a yellow-green to bright green colored tangled mat, and are composed of elongate barrel-shaped cells, each with two star-shaped (stellate) chloroplast A chloroplast () is a type of membrane-bound organelle, organelle known as a plastid that conducts photosynthesis mostly in plant cell, plant and algae, algal cells. Chloroplasts have a high concentration of chlorophyll pigments which captur ...s arrayed along the axis of the cell. Species Some species include: * ''Z. atrocoeruleum'' * ''Z. binuclearioides'' * ''Z. carinthiacum'' * ''Z. carteri'' * ''Z. circumcarinatum'' * ''Z. coeruleum'' * ''Z. conspicuum'' * ''Z. cruciatum'' * ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sirogonium
''Sirogonium'' is a genus of filamentous charophyte green algae of the order Zygnematales. It is found in freshwater areas on all continents but Antarctica. ''Spirogyra'' measures approximately 32–115 μm in width. Each cell contains 2–10 chloroplasts in a ribbon, in contrast to the closely related genus ''Spirogyra'', which has chloroplasts in a coil. Molecular phylogenetic studies have placed ''Sirogonium'' inside a clade consisting of ''Spirogyra'' species; in other words, ''Spirogyra'' is paraphyletic Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ... with respect to ''Sirogonium''. Species The following species are currently accepted: * '' Sirogonium calosporum'' Zhu * '' Sirogonium ceylanicum'' Wittrock * '' Sirogonium decoratum'' Prescott * '' Sirogonium dentic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algae
Algae ( , ; : alga ) is an informal term for any organisms of a large and diverse group of photosynthesis, photosynthetic organisms that are not plants, and includes species from multiple distinct clades. Such organisms range from unicellular microalgae, such as cyanobacteria, ''Chlorella'', and diatoms, to multicellular macroalgae such as kelp or brown algae which may grow up to in length. Most algae are aquatic organisms and lack many of the distinct cell and tissue types, such as stomata, xylem, and phloem that are found in embryophyte, land plants. The largest and most complex marine algae are called seaweeds. In contrast, the most complex freshwater forms are the Charophyta, a Division (taxonomy), division of green algae which includes, for example, ''Spirogyra'' and stoneworts. Algae that are carried passively by water are plankton, specifically phytoplankton. Algae constitute a Polyphyly, polyphyletic group because they do not include a common ancestor, and although Eu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Netrium
''Netrium'' is a genus of algae belonging to the family Mesotaeniaceae The Mesotaeniaceae are a small family of unicellular green algae known as the "saccoderm desmids". The Mesotaeniaceae appear to be sister or ancestral to the Zygnemataceae. The desmids are a deep branching group of Zygnemataceae. ''Spirotaenia'' .... The species of this genus are found in Europe, America and Australia. Species: *'' Netrium digitus'' *'' Netrium interruptum'' *'' Netrium lamellosum'' *'' Netrium naegelii'' *'' Netrium obesus'' *'' Netrium oblongum'' References {{Taxonbar, from=Q1231838 Zygnematales Charophyta genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
