Haesselia

	Haesselia ''Haesselia'' is a genus of liverworts in the family Cephaloziaceae. It contains the following species (but this list may be incomplete): * '' Haesselia roraimensis'' Grolle & Gradst. The genus name of ''Haesselia'' is in honour of Gabriela Gustava Hässel de Menéndez (1927-2009), who was an Argentinian botanist (Bryology), who also was a Geologist. The genus was circumscribed In geometry, the circumscribed circle or circumcircle of a polygon is a circle that passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. Not every po ... by Riclef Grolle and Stephan Robbert Gradstein in J. Hattori Bot. Lab. vol.64 on page 327 in 1988. References Cephaloziaceae Jungermanniales genera Taxonomy articles created by Polbot {{bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Haesselia Roraimensis ''Haesselia roraimensis'' is a species of liverwort in the family Cephaloziaceae. It is endemic to Guyana. Its natural habitat is on rotten logs in periodically flooded riverine forest from 550 and to 1,550 meters elevation, in the humid submontane tropical 'mossy' forests on the slopes of Mount Roraima Mount Roraima ( es, Monte Roraima; Tepuy Roraima; Cerro Roraima pt, Monte Roraima ) is the highest of the Pakaraima chain of tepuis (table-top mountain) or plateaux in South America. It is located at the junction of Venezuela, Brazil and Guyan ..., where the borders of Brazil, Venezuela, and Guyana meet. References Cephaloziaceae Flora of Guyana Vulnerable plants Taxonomy articles created by Polbot Flora of the Tepuis {{Bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Cephaloziaceae Cephaloziaceae is a family of liverworts. Liverworts of this family are dioecious plants which have creeping or upright forms. They are green, brown, reddish, or purplish in color. The leaves are alternately arranged and succubous. Oil bodies are rare. They reproduce sexually, or vegetatively via gemmae.Yang, JCephaloziaceae Overview. BiotaTaiwanica. Taiwan Biodiversity Information Facility. Subfamilies and genera Subfamilies and genera of Cephaloziaceae * Alobielloideae R.M.Schust. '' Alobiella'' (Spruce) Schiffn. '' Alobiellopsis'' R.M.Schust. * Cephalozioideae Müll.Frib. '' Cephalozia'' Dumort.) Dumort. '' Fuscocephaloziopsis'' Fulford *'' Nowellia'' Mitt. Odontoschismatoideae H.Buch ex Grolle *'' Odontoschisma'' (Dumort.) Dumort. Schiffnerioideae R.M.Schust. *'' Schiffneria'' Steph. Trabacelluloideae R.M.Schust. '' Haesselia'' Grolle & Gradst. '' Trabacellula'' Fulford Family Cephaloziaceae is frequently rearranged. For example, genetic analysis G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Marchantiophyta The Marchantiophyta () are a division of non-vascular land plants commonly referred to as hepatics or liverworts. Like mosses and hornworts, they have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of genetic information. It is estimated that there are about 9000 species of liverworts. Some of the more familiar species grow as a flattened leafless thallus, but most species are leafy with a form very much like a flattened moss. Leafy species can be distinguished from the apparently similar mosses on the basis of a number of features, including their single-celled rhizoids. Leafy liverworts also differ from most (but not all) mosses in that their leaves never have a costa (present in many mosses) and may bear marginal cilia (very rare in mosses). Other differences are not universal for all mosses and liverworts, but the occurrence of leaves arranged in three ranks, the presence of deep lobes or segmented leaves, or a lack of clearly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Geologist A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, earth science, or geophysics, although backgrounds in physics, chemistry, biology, and other sciences are also useful. Field research (field work) is an important component of geology, although many subdisciplines incorporate laboratory and digitalized work. Geologists can be classified in a larger group of scientists, called geoscientists. Geologists work in the energy and mining sectors searching for natural resources such as petroleum, natural gas, precious and base metals. They are also in the forefront of preventing and mitigating damage from natural hazards and disasters such as earthquakes, volcanoes, tsunamis and landslides. Their studies are used to warn the general public of the occurrence of these events. Geologists are also important contributors to ... [...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. 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 molecular phylogene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Stephan Robbert Gradstein Stephan may refer to: * Stephan, South Dakota, United States * Stephan (given name), a masculine given name * Stephan (surname), a Breton-language surname See also * Sankt-Stephan * Stefan (other) * Stephan-Oterma * Stephani * Stephen (other) * von Stephan Ernst Heinrich Wilhelm von Stephan (born Heinrich Stephan, January 7, 1831 – April 8, 1897) was a general post director for the German Empire who reorganized the German postal service. He was integral in the founding of the Universal Postal ... {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Jungermanniales Genera Jungermanniales is the largest order of liverworts. They are distinctive among the liverworts for having thin leaf-like flaps on either side of the stem. Most other liverworts are thalloid, with no leaves. Due to their dorsiventral organization and scale-like, overlapping leaves, the Jungermanniales are sometimes called "scale-mosses". Families of Jungermanniales An updated classification by Söderström et al. 2016 * Cephaloziineae Schljakov amesoniellineae Adelanthaceae Grolle 1972 amesoniellaceae He-Nygrén et al. 2006 Anastrophyllaceae Söderström et al. 2010b Cephaloziaceae Migula 1904 Cephaloziellaceae Douin 1920 hycolepidoziaceae Schuster 1967 Lophoziaceae Cavers 1910 Scapaniaceae Migula 1904 iplophyllaceae Potemk. 1999; Chaetophyllopsaceae Schuster 1960* Jungermanniineae Schuster ex Stotler & Crandall-Stotler 2000 eocalycineae Schuster 1972 Acrobolbaceae Hodgson 1962 Antheliaceae Schuster 1963 Arnelliaceae Nakai 1943 Balantiopsidac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]