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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] |
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] |
Jean-Baptiste Mougeot
Jean-Baptiste Mougeot (25 September 1776, in Bruyères – 5 December 1858) was a French physician and botanist. From 1798 to 1802, he was stationed in Germany as an army health officer, afterwards returning to his hometown of Bruyères, where he settled as a physician. From 1833 until his death in 1858, he was a member of the ''conseil général'' for the département of Vosges.BHL Taxonomic literature : a selective guide to botanical publications Together with , and |
Monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. Theoretical implications Monotypic taxa present several important theoretical challenges in biological classification. One key issue is known as "Gregg's Paradox": if a single species is the only member of multiple hierarchical levels (for example, being the only species in its genus, which is the only genus in its family), then each level needs a distinct definition to maintain logical structure. Otherwise, the different taxonomic ranks become effectively identical, which creates problems for organizing biological diversity in a hierarchical syste ... [...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] |
Botanist
Botany, also called plant science, is the branch of natural science and biology studying plants, especially Plant anatomy, their anatomy, Plant taxonomy, taxonomy, and Plant ecology, ecology. A botanist or plant scientist is a scientist who specialises in this field. "Plant" and "botany" may be defined more narrowly to include only land plants and their study, which is also known as phytology. Phytologists or botanists (in the strict sense) study approximately 410,000 species of Embryophyte, land plants, including some 391,000 species of vascular plants (of which approximately 369,000 are flowering plants) and approximately 20,000 bryophytes. Botany originated as history of herbalism#Prehistory, prehistoric herbalism to identify and later cultivate plants that were edible, poisonous, and medicinal, making it one of the first endeavours of human investigation. Medieval physic gardens, often attached to Monastery, monasteries, contained plants possibly having medicinal benefit. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumscription (taxonomy)
In biological taxonomy, circumscription is the content of a taxon, that is, the delimitation of which subordinate taxa are parts of that taxon. For example, if we determine that species X, Y, and Z belong in genus A, and species T, U, V, and W belong in genus B, those are our circumscriptions of those two genera. Another systematist might determine that T, U, V, W, X, Y, and Z all belong in genus A. Agreement on circumscriptions is not governed by the Codes of Zoological or Botanical Nomenclature, and must be reached by scientific consensus. A goal of biological taxonomy is to achieve a stable circumscription for every taxon. This goal conflicts, at times, with the goal of achieving a natural classification that reflects the evolutionary history of divergence of groups of organisms. Balancing these two goals is a work in progress, and the circumscriptions of many taxa that had been regarded as stable for decades are in upheaval in the light of rapid developments in molecu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eduard Palla
Eduard Palla (3 September 1864 – 7 March 1922) was an Austrian botanist and mycologist of Moravian descent. As a botanist he specialized in research of Cyperaceae (sedges), of which he was the taxonomic authority of many species. From 1883 to 1887 he studied natural sciences at the University of Vienna, receiving his doctorate with a dissertation on the anatomy and systematics of Cyperaceae. Following graduation he worked as an assistant to Gottlieb Haberlandt at the University of Graz, where in 1891 he obtained his habilitation in botany. In 1900–01 he conducted investigations of sedges and tropical fungi on Java and Sumatra of the Dutch East Indies. In 1909 he became an associate professor at Graz, followed by a full professorship in 1913. Selected works * ''Atlas der Alpenflora'' (with Karl Wilhelm von Dalla Torre and Anton Hartinger), II, new edition, 1897 – Atlas of Alpine flora. * ''Ueber die gattung Phyllactinia'', 1899 – On the genus '' Phyllactinia''. * ''Zur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charophyta Genera
Charophyta () is a Paraphyly, paraphyletic group of freshwater green algae, called charophytes (), sometimes treated as a Division (taxonomy), division, yet also as a Division (taxonomy), superdivision. The terrestrial plants, the Embryophyta emerged deep within Charophyta, possibly from terrestrial unicellular charophytes, with the class Zygnematophyceae as a sister group. With the Embryophyta now cladistically placed in the Charophyta, it is a synonym of Streptophyta. The sister group of the charophytes are the Chlorophyta. In some charophyte groups, such as the Zygnematophyceae or conjugating green algae, Flagellum, flagella are absent and sexual reproduction does not involve free-swimming flagellate sperm. Flagellate sperm, however, are found in stoneworts (Charales) and Coleochaetales, orders of parenchymatous charophytes that are the closest relatives of the land plants, where flagellate sperm are also present in all except the Pinophyta, conifers and Angiosperm, flowering ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
