|
Pyxine Subcinerea
''Pyxine subcinerea'' is a species of foliose lichen in the family Caliciaceae. It has a pantropical distribution, and typically grows on bark, but less commonly on rocks. The lichen is characterised by its yellow medulla, soralia on the margins on the lobes that make up the thallus, and the presence of the chemical lichexanthone in the cortex. Taxonomy The lichen was first formally described by the Scottish scientist James Stirton from specimens collected in Queensland, Australia. He noted that its thallus was similar to that of ''Pyxine sorediata'', but Stirton distinguished it from that species by the "internal organization of both the thallus and the apothecia", as well as the negative K reaction of the thallus, compared to the yellow reaction of ''P. sorediata''. Synonyms of ''Pyxine subcinerea'' include: ''Physcia melanenta'', described by Charles Knight in 1882; ''Pyxine chrysanthoides'', described by Edvard August Vainio in 1915 from material collected in the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Stirton
James Stirton (1833, Coupar Angus, Perthshire – 14 January 1917, Glasgow) was a Scottish physician and one of Scotland's leading experts on cryptogamic botany. His investigations in bryology and lichenology earned him a world-wide reputation. Biography Stirton taught mathematics from 1856 to 1858 at the Merchiston Castle School in Edinburgh. At the University of Edinburgh he graduated in 1857 L.R.C.P.Edin and in 1858 M.D.Edin. Soon after acquiring his M.D. he moved to Glasgow and established an extensive practice in obstetrics and gynaecology. In 1876 Stirton was appointed a lecturer in gynaecology at the Glasgow Royal Infirmary, where for many years he had charge of the gynaecological wards. In 1889 he became a professor of midwifery at Anderson’s College Medical School and held the professorship for about fifteen years. Stirton made many visits to the Scottish mountains to investigate lichens and mosses and there discovered numerous species that were previously undescribed. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weddellite
Weddellite ( Ca C2 O4·2 H2O) is a mineral form of calcium oxalate named for occurrences of millimeter-sized crystals found in bottom sediments of the Weddell Sea, off Antarctica. Occasionally, weddellite partially dehydrates to whewellite, forming excellent pseudomorphs of grainy whewellite after weddellite's short tetragonal dipyramids. It was first described in 1936 but only named in 1942. Structural properties Weddellite, or calcium oxalate dihydrate, crystallises in a tetragonal system: the classic crystal shape is the eight-face bipyramid. Using bright field microscopy, the weddellite crystals are recognised easily by their shape, reminiscent of a postal envelope. More complex shapes of weddellite are possible; the dumbbell shape is not rare and has no precise angles or sides. This form is, in reality, a microcrystalline agglomerate that takes the shape of a biconcave disc. Weddellite crystals are poorly birefringent and do not show any interference pattern under polarised l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pruinose
Pruinescence , or pruinosity, is a "frosted" or dusty-looking coating on top of a surface. It may also be called a pruina (plural: ''pruinae''), from the Latin word for hoarfrost. The adjectival form is pruinose . Entomology In insects, a "bloom" caused by wax particles on top of an insect's cuticle covers up the underlying coloration, giving a dusty or frosted appearance. The pruinescence is commonly white to pale blue in color but can be gray, pink, purple, or red; these colors may be produced by Tyndall scattering of light. When pale in color, pruinescence often strongly reflects ultraviolet. Pruinescence is found in many species of Odonata, particularly damselflies of the families Lestidae and Coenagrionidae, where it occurs on the wings and body. Among true dragonflies it is most common on male Libellulidae (skimmers). In the common whitetail and blue dasher dragonflies (''Plathemis lydia'' and ''Pachydiplax longipennis''), males display the pruinescence on the back of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substrate (biology)
In biology, a substrate is the surface on which an organism (such as a plant, fungus, or animal) lives. A substrate can include biotic or abiotic materials and animals. For example, encrusting algae that lives on a rock (its substrate) can be itself a substrate for an animal that lives on top of the algae. Inert substrates are used as growing support materials in the hydroponic cultivation of plants. In biology substrates are often activated by the nanoscopic process of substrate presentation. In agriculture and horticulture * Cellulose substrate * Expanded clay aggregate (LECA) * Rock wool * Potting soil * Soil In animal biotechnology Requirements for animal cell and tissue culture Requirements for animal cell and tissue culture are the same as described for plant cell, tissue and organ culture (In Vitro Culture Techniques: The Biotechnological Principles). Desirable requirements are (i) air conditioning of a room, (ii) hot room with temperature recorder, (iii) microscope r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyxine Subcinerea - Flickr - Pellaea
''Pyxine'' is a genus of foliose lichens in the family Caliciaceae. The genus has a widespread distribution in tropical regions. The presence or absence of the compound lichexanthone is a character used in classifying ''Pyxine '' species; about 20 species contain this compound. This represents the largest group of foliose lichens with the compound. Species *''Pyxine albovirens'' *'' Pyxine astipitata'' – Brazil *''Pyxine astridiana'' – neotropical *''Pyxine australiensis'' – Asia; Australia *'' Pyxine berteriana'' – pantropical *''Pyxine boonpragobiana'' – Thailand *'' Pyxine coccifera'' *''Pyxine cocoes'' *''Pyxine cognata'' - pantropical *''Pyxine consocians'' *''Pyxine convexior'' *''Pyxine copelandii'' *''Pyxine cylindrica'' – Papua New Guinea *''Pyxine dactyloschmidtii'' *''Pyxine daedalea'' – Costa Rica *''Pyxine desudans'' – Australia *''Pyxine elixii'' – Australia *''Pyxine endochrysina'' *''Pyxine endocrocea'' *''Pyxine eschweileri'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Andrew Imshaug
Henry Andrew Imshaug (1925–2010) was an American lichenologist notable for work on the genus ''Buellia'' and his "enormous and important collections from the Rocky Mountains, Great Lakes region, West Indies and subantarctic islands, together with his studies of those collections".Henry Andrew Imshaug—1925–2010: A tribute, Irwin M. Brodo, The Bryologist 114(2):401–407. 2011/ref> He is also known for mentoring numerous notable lichenologists and Bryophyte, bryologists. He was a professor at Michigan State University Michigan State University (Michigan State, MSU) is a public university, public Land-grant university, land-grant research university in East Lansing, Michigan. It was founded in 1855 as the Agricultural College of the State of Michigan, the fi .... Imshaug is honoured in the lichen genus name '' Imshaugia''. See also * :Taxa named by Henry Andrew Imshaug References {{DEFAULTSORT:Imshaug, Henry Andrew American lichenologists 1925 births 2010 death ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Tuckerman
Edward Tuckerman (December 7, 1817 in Boston, Massachusetts – March 15, 1886) was an American botanist and professor who made significant contributions to the study of lichens and other alpine plants. He was a founding member of the Natural History Society of Boston and most of his career was spent at Amherst College. He did the majority of his collecting on the slopes of Mount Washington in the White Mountains of New Hampshire. Tuckerman Ravine was named in his honor. The standard botanical author abbreviation Tuck. is applied to species he described. Early life and education Tuckerman was the eldest son of a Boston merchant, also Edward Tuckerman, and Sophia (May) Tuckerman. He studied at Boston Latin School and then at his father's urging at Union College in Schenectady, which he entered as a sophomore and where he completed a BA in 1837 and to which he returned for his MA after taking a law degree at Harvard in 1839, traveling in Germany and Scandinavia, and making ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johannes Müller Argoviensis
Johann Müller (9 May 1828 - 28 January 1896) was a Swiss botanist who was a specialist in lichens. He published under the name Johannes Müller Argoviensis to distinguish himself from other naturalists with similar names. Biography Müller was born into a farming family on 9 May 1828 in Teufenthal, Switzerland. He received his education at the Reinach gymnasium and then entered the Aargau industrial school, where he was passionate about botany and mathematics. Encouraged by Hans Schinz he built a herbarium of the flora of Aargau. In 1850 and 1851 he studied in Geneva and came into contact with prominent botanists Edmond Boissier and Alphonse Pyrame de Candolle (who offered him the vacant post of curator at his herbarium). In the spring of 1851 he collected in southern France with Jean Étienne Duby. The herbarium specimens from this trip were later sent to several herbaria in Europe. The following year, Müller travelled with Boissier to collect plants in the Alps of Savoy, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antilles
The Antilles (; gcf, label=Antillean Creole, Antiy; es, Antillas; french: Antilles; nl, Antillen; ht, Antiy; pap, Antias; Jamaican Patois: ''Antiliiz'') is an archipelago bordered by the Caribbean Sea to the south and west, the Gulf of Mexico to the northwest, and the Atlantic Ocean to the north and east. The Antillean islands are divided into two smaller groupings: the Greater Antilles and the Lesser Antilles. The Greater Antilles includes the larger islands of the Cayman Islands, Cuba, Hispaniola (subdivided into the nations of the Dominican Republic and Haiti), Jamaica, and Puerto Rico. The Lesser Antilles contains the northerly Leeward Islands and the southeasterly Windward Islands as well as the Leeward Antilles just north of Venezuela. The Lucayan Archipelago (consisting of The Bahamas and the Turks and Caicos Islands), though a part of the West Indies, is generally not included among the Antillean islands. Geographically, the Antillean islands are generally consid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edvard August Vainio
Edvard August Vainio (born Edvard Lang; 5 August 185314 May 1929) was a Finnish lichenology, lichenologist. His early works on the lichens of Lapland (Finland), Lapland, his three-volume monograph on the lichen genus ''Cladonia'', and, in particular, his study of the taxonomy (biology), classification and morphology (biology), form and structure of lichens in Brazil, made Vainio renowned internationally in the field of lichenology. Young Vainio's friendship with university student Johan Petter Norrlin, who was nearly eleven years older, helped him develop an impressive knowledge of the local cryptogams (ferns, mosses, algae, and fungi, including lichens) and afforded him ample opportunity to hone his collection and identification (biology), identification techniques at an early age. It was through this association that Vainio met Norrlin's teacher, the prominent lichenologist William Nylander (botanist), William Nylander, who supported his early botanical efforts. Vainio's earli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Knight (doctor)
Charles Knight ( 1808 – 3 September 1891) was a New Zealand doctor, public servant and botanist. He was born in Rye, Sussex, England in 1808. He studied medicine at University College, London from 1828 until 1830. In 1840 he became a Member of the Royal College of Surgeons of Great Britain and Ireland and a Fellow in 1869. Between 1830 and 1840 Knight worked as a doctor and spent time in America. Administrative career In 1841 he sailed to Australia as ship's surgeon on the ''Lord Glenelg''. After arrival, he was employed by the Governor of South Australia, George Grey as a clerk. Knight moved with Grey when the latter was appointed Governor of New Zealand. In February 1846 Knight was appointed as the country's inaugural auditor-general and in 1855 became manager of the Colonial Bank of Issue and then auditor of public accounts and chaired many official commissions into subjects as diverse as flax production, meteorology and civil servant employment conditions. He later re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
