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Ctenitis Rapensis
''Ctenitis'' is a fern genus in the family Dryopteridaceae, subfamily Dryopteridoideae, in the Pteridophyte Phylogeny Group classification of 2016 (PPG I). Selected species The genus has a large number of species. The PPG I classification suggested that there were about 125 species; , the ''Checklist of Ferns and Lycophytes of the World'' listed 143. *'' Ctenitis pallatangana'' (Hook. Sir William Jackson Hooker (6 July 178512 August 1865) was an English botanist and botanical illustrator, who became the first director of Kew when in 1841 it was recommended to be placed under state ownership as a botanic garden. At Kew he ...) Ching *'' Ctenitis sloanei'' (Poepp. ex Spreng.) Morton *'' Ctenitis squamigera'' (Brack.) Copel. References Dryopteridaceae Fern genera {{Dryopteridaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Christensen (botanist)
Carl Frederik Albert Christensen (16 January 1872 – 24 November 1942) was a Danish systematic botanist. He graduated in natural history from the University of Copenhagen under professor Eugenius Warming. He was then a school teacher in Copenhagen, and later superintendent at the Botanical Museum. He was a specialist in ferns and published a catalogue of the World's Pteridophytes, '' Index Filicum''. In addition, he authored a three-volume work on the history of botany in Denmark Denmark is a Nordic countries, Nordic country in Northern Europe. It is the metropole and most populous constituent of the Kingdom of Denmark,, . also known as the Danish Realm, a constitutionally unitary state that includes the Autonomous a .... Selected scientific works * Christensen, Carl (1905–06) Index Filicum. 744 s. Index Filicum Supplementum I-III (1913–17). Reprint 1973 by Koeltz Antiquariat. * Christensen, Carl (1924-1926) Den danske botaniks historie med tilhørende Bibliografi. K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fern
The ferns (Polypodiopsida or Polypodiophyta) are a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. They differ from mosses by being vascular, i.e., having specialized tissues that conduct water and nutrients, and in having life cycles in which the branched sporophyte is the dominant phase. Ferns have complex leaf, leaves called megaphylls that are more complex than the microphylls of clubmosses. Most ferns are leptosporangiate ferns. They produce coiled Fiddlehead fern, fiddleheads that uncoil and expand into fronds. The group includes about 10,560 known extant species. Ferns are defined here in the broad sense, being all of the Polypodiopsida, comprising both the leptosporangiate (Polypodiidae (plant), Polypodiidae) and eusporangiate ferns, the latter group including horsetails, Psilotaceae, whisk ferns, marattioid ferns, and ophioglossoid ferns. The fern crown group, consisting of the leptosporangiates and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dryopteridaceae
The Dryopteridaceae are a Family (biology), family of leptosporangiate ferns in the Order (biology), order Polypodiales. They are known Common name, colloquially as the wood ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family is placed in the suborder Polypodiineae. Alternatively, it may be treated as the subfamily Dryopteridoideae of a very broadly defined family Polypodiaceae ''Sensu, sensu lato''. The family contains about 1700 species and has a cosmopolitan distribution. Species may be terrestrial plant, terrestrial, epipetric, hemiepiphyte, hemiepiphytic, or epiphytic. Many are Gardening, cultivated as ornamental plants. The largest genera are ''Elaphoglossum'' (600+), ''Polystichum'' (260), ''Dryopteris'' (225), and ''Ctenitis'' (150). These four genera contain about 70% of the species. Dryopteridaceae Evolutionary radiation, diverged from the other families in eupolypods I about 100 million years ago. The fossil record appears to sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteridophyte Phylogeny Group
The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes ( lycophytes and ferns) that reflects knowledge about plant relationships discovered through phylogenetic studies. In 2016, the group published a classification for extant pteridophytes, termed "PPG I". The paper had 94 authors (26 principal and 68 additional). The classification was presented as a consensus classification supported by the community of fern taxonomists. Alternative classifications of ferns exist and are preferred by some. PPG I A first classification, PPG I, was produced in 2016, covering only extant (living) pteridophytes. The classification was rank-based, using the ranks of class, subclass, order, suborder, family, subfamily and genus. Phylogeny The classification was based on a consensus phylogeny, shown below to the level of order. The very large order Polypodiales was divided into two subord ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenitis Pallatangana
''Ctenitis pallatangana'' is a species of fern. The only known collection was made more than a century ago, near Pallatanga in Chimborazo province, Ecuador, in high Andean forest above 1 500 m altitude. Lack of any further collections and widespread destruction of its habitat has resulted in it being listed by the IUCN as "Critically Endangered (Possibly Extinct)". The main threat to the species is believed to be habitat destruction by agricultural expansion Agricultural expansion describes the growth of agricultural land ( arable land, pastures, etc.) especially in the 20th and 21st centuries. The agricultural expansion is often explained as a direct consequence of the global increase in food and e .... References Dryopteridaceae {{Dryopteridaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hook
A hook is a tool consisting of a length of material, typically metal, that contains a portion that is curved/bent back or has a deeply grooved indentation, which serves to grab, latch or in any way attach itself onto another object. The hook's design allows traction forces to be relayed through the curved/indented portion to and from the proximal end of the hook, which is either a straight shaft (known as the hook's ''shank'') or a ring (sometimes called the hook's "''eye''") for attachment to a thread (yarn), thread, rope or chain, providing a reversible attachment between two objects. In many cases, the distal end of the hook is sharply pointed to enable penetration into the target material, providing a firmer anchorage. Some hooks, particularly fish hooks, also have a ''barb'', a backwards-pointed projection near the pointed end that functions as a secondary "mini-hook" to catch and trap surrounding material, ensuring that the hook point cannot be easily pulled back out once e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenitis Sloanei
''Ctenitis sloanei'' (commonly known as the Florida tree fern, red hair comb fern, Bermuda cave fern, or Florida lacefern) is a species of wood fern native to USA (Florida), Bermuda, Cuba, the Caribbean, Mexico, Central America, and northwestern South America. Although it does not belong to the order Cyatheales (the group that contains most tree ferns), it is still considered by some to be a type of tree fern. This would make it the only tree fern native to the continental United States (the parts of the US that exclude Hawaii, Alaska and overseas territories). A member of the genus '' Ctenitis'', it was formerly classified under the genus ''Dryopteris'' as ''Dryopteris ampla''. The population of this fern has been damaged and it is noted to possibly be endangered. Description ''Ctenitis sloanei'' mainly grows in moist tropical hammocks and near exposed limestone. It is a perennial which grows up to 1.21 meters (4 ft) tall on average. The fern is also evergreen In bot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenitis Squamigera
''Ctenitis squamigera'', commonly known as the Pacific lacefern or ''pauoa'', is a critically endangered species of fern found only on the islands of Hawaii.Bruegmann, M. M. & V. Caraway. (2003)''Ctenitis squamigera'' IUCN Red List of Threatened Species. IUCN 2010www.iucnredlist.org . Retrieved on 23 February 2011. In 2003 there were at least 183 individuals remaining, divided among 23 populations.USFWS''Ctenitis squamigera'' Five-year Review.July 2009. Several populations consist of only one to four plants. Threats to the species include the degradation of the Hawaiian forests by Axis deer, Mouflon sheep, feral pigs and goats, and invasive plant species such as Santa Barbara daisy and guava. This fern is a federally listed endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
