|
Salvinia Herzogii
''Salvinia'', a genus in the family Salviniaceae, is a floating fern named in honor of Anton Maria Salvini, a 17th-century Italian scientist. Watermoss is a common name for ''Salvinia''. The genus was published in 1754 by Jean-François Séguier, in his description of the plants found round Verona, ''Plantae Veronenses'' Twelve species are recognized, at least three of which (''S. molesta'', ''S. herzogii'', and ''S. minima'') are believed to be hybrids, in part because their sporangia are found to be empty. ''Salvinia'' is related to the other water ferns, including the mosquito fern ''Azolla''. Recent sources include both ''Azolla'' and ''Salvinia'' in Salviniaceae, although each genus was formerly given its own family. ''Salvinia'', like the other ferns in order Salviniales, are heterosporous, producing spores of differing sizes. However, leaf development in ''Salvinia'' is unique. The upper side of the floating leaf, which appears to face the stem axis, is morphologically ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean-François Séguier
Jean-François Séguier (; 25 November 1703 – 1 September 1784) was a French archaeologist, epigraphist, astronomer and botanist from Nîmes. He studied law in Montpellier, during which time, he developed a passion for botany. He was a friend and collaborator to Scipio Maffei, with whom he took an extended scientific tour throughout Europe (1732–36). In 1755 he became a member of the Académie de Nîmes, serving as its ''secrétaire perpétuel'' from 1765 to 1784. In 1772 he became a member of the Académie royale des Inscriptions et Belles-Lettres. The plant genus ''Seguieria'' (family Petiveriaceae, Loefl., 1758) commemorates his name, as do the botanical species ''Ranunculus seguieri'' ( Vill., 1779), ''Euphorbia seguieriana'' ( Neck., 1770), and '' Dianthus seguieri'' ( Vill., 1779). Published works His written works include a detailed description of the flora in the vicinity of Verona Verona ( , ; vec, Verona or ) is a city on the Adige River in Veneto, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anton Maria Salvini
Anton Maria Salvini (1653–1729) was an Italian naturalist and classicist who lived in Tuscany. An accomplished linguist, he is noted for his translations of texts in Latin, Greek, and Hebrew. Biography Born in Florence, at the age of 12, he began studies under Jesuits. Among his fellow students was future cardinal Giovanni Battista Tolomei and future bishop of Florence, Ansaldo Ansaldi (1651–1719). In 1669, he was sent to the University of Pisa to study jurisprudence. He became a member of the ''Accademia degli Apatisti'', founded by Agostino Coltellini (1613-1693). At Pisa, he studied under Bartolomeo Cheti. In 1679, he graduated with a doctorate in canon and civil law. He was sent to work under a lawyer Andrea Poltri, but passed the time reading and studying texts. He was not functioning well or interested in being a lawyer, but he gained the reputation of a scholarly polyglot, knowing multiple languages. Francesco Redi is said to have commented that: ''Ei da un colmo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trichome
Trichomes (); ) are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant is an indumentum, and the surface bearing them is said to be pubescent. Algal trichomes Certain, usually filamentous, algae have the terminal cell produced into an elongate hair-like structure called a trichome. The same term is applied to such structures in some cyanobacteria, such as '' Spirulina'' and ''Oscillatoria''. The trichomes of cyanobacteria may be unsheathed, as in ''Oscillatoria'', or sheathed, as in ''Calothrix''. These structures play an important role in preventing soil erosion, particularly in cold desert climates. The filamentous sheaths form a persistent sticky network that helps maintain soil structure. Plant trichomes Plant trichomes have many different features that vary between both species of pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sporocarp (ferns)
A sporocarp is a specialised type of structure in the aquatic ferns of the order Salviniales whose primary function is the production and release of spores. Sporocarps are found only in the Salviniales, a group that is aquatic and heterosporous, but the structures are very different in the two families of the order. In the Salviniaceae family, the sporocarp is nothing more than a modified sorus, a single cluster of spore-producing tissues enclosed by a thin sphere of tissue and attached to the leaves. In the Marsileaceae (water-clover) family, the sporocarp is a more elaborate structure formed from an entire leaf whose development and form is greatly modified. These are hairy, short-stalked, bean-shaped structures (usually 3 to 8 mm in diameter) with a hardened outer covering. This outer covering is tough and resistant to drying out, allowing the spores inside to survive unfavorable conditions such as winter frost or summer desiccation. Despite this toughness, the sporocarps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sorus
A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (plural coenosori) is a compound sorus composed of multiple, fused sori. Etymology This New Latin word is from Ancient Greek σωρός (''sōrós'' 'stack, pile, heap'). Structure In lichens and other fungi, the sorus is surrounded by an external layer. In some red algae, it may take the form of depression into the thallus. In ferns, the sori form a yellowish or brownish mass on the edge or underside of a fertile frond. In some species, they are protected during development by a scale or film of tissue called the indusium, which forms an umbrella-like cover. Lifecycle significance Sori occur on the sporophyte generation, the sporangia within producing haploid meiospores. As the sporangia mature, the indusium shrivels so that spore release is unimpeded. The sporangia then burst and release the spores. As an aid to identification The shape, arrangement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caney Lakes Recreation Area
Caney may refer to: Places In the United States: * Caney, Kansas * Caney, Kentucky * Pippa Passes, Kentucky, known to its inhabitants as Caney or Caney Creek * Caney, Oklahoma, in Atoka County * Caney, Cherokee County, Oklahoma Caney is a census-designated place (CDP) in Cherokee County, Oklahoma, United States, within the Cherokee Nation. It was first listed as a CDP prior to the 2020 census. It includes the unincorporated community of Tailholt. The CDP is in easter ... In Cuba: * El Caney See also * Caney Creek (other) {{geodis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Webster Parish, Louisiana
Webster Parish (French: ''Paroisse de Webster'') is a parish located in the northwestern section of the U.S. state of Louisiana. The seat of the parish is Minden. As of the 2010 census, the Webster Parish population was 41,207. In 2018, the population estimate was 38,798. Public officials who have long sought to increase the industrial potential of the parish, expressed concern over the decline. Jim Bonsall, the president of the Webster Parish Police Jury, the parish governing body, cited the ending of the Haynesville Shale boom as the primary reason for the population losses. The parish has long depended on jobs in the petroleum and natural gas fields. The parish is named for 19th-century American statesman Daniel Webster of Massachusetts and New Hampshire. It was created on February 27, 1871 from lands formerly belonging to Bienville, Bossier, and Claiborne parishes. The parish centennial celebration was held in May 1971. Speakers included Police jury president Leland ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doyline, Louisiana
Doyline is a village in southwestern Webster Parish in northwestern Louisiana, United States. The population was 818 at the 2010 census. It is part of the Minden Micropolitan Statistical Area. Under a cited cost-saving realignment plan, the Webster Parish School Board closed Union Elementary School in Doyline in 2011, as Doyline High School absorbed the elementary students. Vandals broke windows in the abandoned elementary school, which contained asbestos and black mold. The building was hence razed at a cost of $99,000. The HBO television series ''True Blood'' about vampires is filmed in Doyline. History Doyline is an entry point to Lake Bistineau and the Lake Bistineau State Park. The lake itself, popular for fishing, is the reservoir of Dorcheat Bayou, a 122-mile stream that begins in Nevada County, Arkansas. The Doyline High School Panthers won their state basketball championship in 1967, and two of the players pursued athletic careers. Tommy Joe Eagles pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Bistineau
A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much larger oceans, they do form part of the Earth's water cycle. Lakes are distinct from lagoons, which are generally coastal parts of the ocean. Lakes are typically larger and deeper than ponds, which also lie on land, though there are no official or scientific definitions. Lakes can be contrasted with rivers or streams, which usually flow in a channel on land. Most lakes are fed and drained by rivers and streams. Natural lakes are generally found in mountainous areas, rift zones, and areas with ongoing glaciation. Other lakes are found in endorheic basins or along the courses of mature rivers, where a river channel has widened into a basin. Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spores
In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, fungi and protozoa. Bacterial spores are not part of a sexual cycle, but are resistant structures used for survival under unfavourable conditions. Myxozoan spores release amoeboid infectious germs ("amoebulae") into their hosts for parasitic infection, but also reproduce within the hosts through the pairing of two nuclei within the plasmodium, which develops from the amoebula. In plants, spores are usually haploid and unicellular and are produced by meiosis in the sporangium of a diploid sporophyte. Under favourable conditions the spore can develop into a new organism using mitotic division, producing a multicellular gametophyte, which eventually goes on to produce gametes. Two gametes fuse to form a zygote which develops into a new s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salviniales
The order Salviniales (formerly known as the Hydropteridales and including the former Marsileales) is an order of ferns in the class Polypodiopsida. Description Salviniales are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spores (megaspores and microspores) that develop into two different types of gametophytes (female and male gametophytes, respectively), and in that their gametophytes are endosporic, meaning that they never grow outside the spore wall and cannot become larger than the spores that produced them. The megasporangia each produce a single megaspore. In being heterosporus with endosporic gametophytes they are more similar to seed plants than to other ferns. The fertile and sterile leaves are dimorphic, taking on a different shape, and leaves bear anastomosing veins. Aerenchyma is frequently present in roots, shoots, and petioles (leaf stalks). The ferns of this order vary radically in form an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may fol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
