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Credneria
''Credneria'' is an extinct genus in the family or Platanaceae of broad-leaf trees similar to extinct ''Platanus'' species that appeared during the Cretaceous. The genus was first described by Zenker (1833) and has formerly been placed in the family Salicaceae rather than Platanaceae on occasion. ''Credneria'' leaves are preserved in sandstone and less often in siltstone. The leaves are typically obovate with a pinnate-actinodromous venation and distinct suprabasal veins. Species Known species are: * *''Credneria biloba'' *''Credneria bohemica'' *''Credneria comparabilis'' *''Credneria cuneifolia'' *''Credneria daturaefolia'' (Ward) *''Credneria denticulata'' *?''Credneria grewiopsoides'' *''Credneria integerrima'' *?''Credneria longifolia'' *''Credneria pachyphylla'' *''Credneria parva'' *''Credneria prophylloides'' ( Knowlton) *''Credneria pulchra'' *?''Credneria spatiosa'' *''Credneria subserrata'' (Hampe) *''Credneria subtriloba'' *''Credneria sudanense'' *''Credneria ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platanaceae
Platanaceae, the "plane-tree family", is a family of flowering plants in the order Proteales. The family consists of only a single extant genus ''Platanus'', with eight known species. The plants are tall trees, native to temperate and subtropical regions of the Northern Hemisphere. The hybrid London plane is widely planted in cities worldwide. Description * Large, sympodial, deciduous tree, speckled bark that sheds in large irregular sheets, leaving a smooth surface that is mottled and pale, persistent bark at the base of the trunk, indumentum with large glandular hairs, multicellular and uniserrate or short with uniserrate ramification (in candelabrum), in stellate fascicles; glandular hairs with unicellular, globular capitulum, cuticular waxes without crystalloids, with rods and plates * Leaves generally with very variable shapes and nervation, simple, alternate, more or less distichous, isobilateral palmate with three to seven lobes (palmatifid to palmatisect) with whol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jonathan Carl Zenker
Jonathan Carl (or Karl) Zenker (1 March 1799 – 6 November 1837) was a German naturalist born in Sundremda, located in the Saalfeld-Rudolstadt district. Originally a student of theology at the University of Jena, he subsequently devoted his energies to science and medicine. From 1823 he lived in Dresden, later returning to Jena, where on the basis of his dissertation "Batrachomyologia", he became a privat-docent of natural history. In 1828 he became an associate professor of botany and natural history, followed by a full professorship in 1836 (one year prior to his death at the age of 38). A genus of grasses called '' Zenkeria'' is named in his honour. Also, he named the genus of fossil broad-leaf trees ''Credneria'' in honor of Karl August Credner. Selected writings * ''Musci Thuringici: vivis exemplaribus exhibuerunt et illustraverunt'', 1821–1823, exsiccata work (with David Nathanael Friedrich Dietrich, 1799–1888). * ''Die Pflanzen und ihr wissenschaftliches Stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yukon River
The Yukon River (Gwichʼin language, Gwich'in: ''Ųųg Han'' or ''Yuk Han'', Central Alaskan Yup'ik language, Yup'ik: ''Kuigpak'', Inupiaq language, Inupiaq: ''Kuukpak'', Deg Xinag language, Deg Xinag: ''Yeqin'', Hän language, Hän: ''Tth'echù'' or ''Chuu k'onn'', Southern Tutchone: Chu Nìikwän, russian: Юкон, Yukon) is a major watercourse of northwestern North America. From its source in British Columbia, Canada, it flows through Canada's territory of Yukon (itself named after the river). The lower half of the river continues westwards through the U.S. state of Alaska. The river is long and empties into the Bering Sea at the Yukon–Kuskokwim Delta. The average flow is . The total drainage area is , of which lies in Canada. The total area is more than 25% larger than Texas or Alberta. The longest river in Alaska and Yukon, it was one of the principal means of transportation during the 1896–1903 Klondike Gold Rush. A portion of the river in Yukon—"The Thirty Mile" se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaltag Formation
Kaltag (Koyukon: ; ik, Qałtaq) is a city and village in Yukon-Koyukuk Census Area, Alaska, United States. At the 2010 census the population was 190, down from 230 in 2000. History Kaltag was a Koyokon Athabascan area used as a cemetery for surrounding villages. It is located on an old portage trail which led west through the mountains to Unalakleet. The Athabascans had seasonal camps in the area and moved as the wild game migrated. There were 12 summer fish camps located on the Yukon River between the Koyukuk River and the Nowitna River. Kaltag was named by Russians for a Koyokon man named Kaltaga. There was a smallpox epidemic in 1839 that killed a large part of the population of the area. After the Alaska Purchase, a United States military telegraph line was constructed along the north side of the Yukon River. A trading post opened around 1880, just before the gold rush of 1884–85. Steamboats on the Yukon, which supplied gold prospectors ran before and after 1900 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cenomanian
The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name. As a unit of geologic time measure, the Cenomanian Age spans the time between 100.5 and 93.9 million years ago (Mya). In the geologic timescale, it is preceded by the Albian and is followed by the Turonian. The Upper Cenomanian starts around at 95 Mya. The Cenomanian is coeval with the Woodbinian of the regional timescale of the Gulf of Mexico and the early part of the Eaglefordian of the regional timescale of the East Coast of the United States. At the end of the Cenomanian, an anoxic event took place, called the Cenomanian-Turonian boundary event or the "Bonarelli event", that is associated with a minor extinction event for marine spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Junior Synonym
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called ''Pinus abies''. This name is no longer in use, so it is now a synonym of the current scientific name, ''Picea abies''. * In zoology, moving a species from one genus to another results in a different binomen, but the name is considered an alternative combination rather than a synonym. The concept of synonymy in zoology is reserved for two names at the same rank that refers to a taxon at that rank - for example, the name ''Papilio prorsa'' Linnaeus, 1758 is a junior synonym of ''Papilio levana'' Linnaeus, 1758, being names for different seasonal forms of the species now referred to as ''Araschnia lev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Arthur Hollick
Charles Arthur Hollick (February 6, 1857 – March 11, 1933), known widely as Arthur Hollick, was an American paleobotanist. He was curator of fossil plants at Columbia University and the New York Botanical Garden. Biography Arthur Hollick was born in New Brighton, Staten Island, New York on February 6, 1857. He received a Bachelor of Philosophy from Columbia School of Mines in 1879 and his doctorate at George Washington University , mottoeng = "God is Our Trust" , established = , type = Private federally chartered research university , academic_affiliations = , endowment = $2.8 billion (2022) , preside ... (then known as Columbian College) in 1897. He died on March 11, 1933. References External links * 1857 births 1933 deaths Paleobotanists People from Staten Island New York Botanical Garden Columbian College of Arts and Sciences alumni Columbia School of Mines alumni Scientists from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank Hall Knowlton
Frank Hall Knowlton (September 2, 1860 - November 22, 1926) was an American botanist, ornithologist and naturalist. Born in Vermont, he joined the Geological Survey and took an interest in fossil plants in the local lignite, later becoming a specialist in paleobotany. He was born in Brandon, Vermont to a family of old settlers. He went to study at Middlebury College where he took an interest in natural history, influenced by Ezra Brainerd and Henry M. Seely. He received a BS in 1884 and an MS in 1887. He visited the US National Museum in Washington in 1884, while preparing an exhibit for the World Cotton Centennial The World Cotton Centennial (also known as the World's Industrial and Cotton Centennial Exposition) was a World's Fair held in New Orleans, Louisiana, United States in 1884. At a time when nearly one third of all cotton produced in the United Sta ... in New Orleans and came in contact with palaeobotanist Lester F. Ward there. He later became an assistant to Ward ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Ernst Ludwig Hampe
Georg Ernst Ludwig Hampe (5 July 1795 – 23 November 1880) was a German pharmacist, botanist and bryologist who was a native of Fürstenberg. In 1810 he became an apprentice pharmacist to his uncle in Brakel, and over the next fifteen years worked in several different pharmacies, including one in Halle an der Saale, where he made the acquaintance of botanist Kurt Sprengel (1766-1833). He also worked at the university pharmacy in Göttingen, and at establishments in Allendorf and Braunschweig. In 1825 he became head of a local pharmacy in Blankenburg am Harz, where he remained its director up until 1864. During his time spent in Blankenburg, Hampe collected and studied flora native to the Harz Mountains. He was particularly interested in mosses, and through his association with bryologist Karl Müller (1818-1899), he became exposed to non-European species from the Americas, Madagascar, New Zealand, Australia, et al. In his collaborative research with Müller, he described nume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
