|
Pyxine Katendei
''Pyxine katendei'' is a species of corticolous (rock-dwelling), foliose lichen in the family Caliciaceae. Found in East Africa, it was scientifically described as a new species in 1975 by lichenologists Dougal Swinscow and Hildur Krog. The lichen has a whitish to pale grey thallus that is tightly appressed to its substrate. The comprising the thallus are somewhat convex; they lack pseudocyphellae (tiny pores for air exchange), and have sparse pruina. The thallus underside is black; the internal medulla is white. The lichen contains triterpenoid compounds as well as lichexanthone; the latter substance causes the lichen to fluoresce when lit with a long-wavelength UV light. ''Pyxine katendei'' is only known to occur in Ethiopia, Uganda, and Kenya ) , national_anthem = "Ee Mungu Nguvu Yetu"() , image_map = , map_caption = , image_map2 = , capital = Nairobi , coordinates = , largest_city ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Douglas Victor Swinscow
Thomas Douglas (Dougal) Victor Swinscow (1917 - 1992) was the founder of the British Lichen Society and the scientific journal ''The Lichenologist''. He was also a member of the editorial team of the British Medical Journal and deputy editor from 1964 until 1977. Early life and education Swinscow's parents were Nellie (née Alleyne) and William Sprague Swinscow. As a child Swinscow explored his home area of Devon and developed his interest in natural history. He was educated at the private boys school Kelly College, Tavistock, Devon. He completed a bachelor degree in medicine at St Thomas's Hospital Medical School in 1939 and subsequently became a licentiate of the Royal College of Physicians, London and was registered as a member of the Royal College of Surgeons. In 1962 he was awarded an M. Sc degree University of London for his studies on the lichen ''Porina''. Career After finishing his medical qualification, and working as a house surgeon at Woking Hospital he joined the Roy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichexanthone
Lichexanthone is an organic compound in the structural class of chemicals known as xanthones. Lichexanthone was first isolated and identified by Japanese chemists from a species of leafy lichen in the 1940s. The compound is known to occur in many lichens, and it is important in the taxonomy of species in several genera, such as ''Pertusaria'' and ''Pyxine''. More than a dozen lichen species have a variation of the word lichexanthone incorporated as part of their binomial name. The presence of lichexanthone in lichens causes them to fluoresce a greenish-yellow colour under long-wavelength UV light; this feature is used to help identify some species. Lichexanthone is also found in several plants (many are from the families Annonaceae and Rutaceae), and some species of fungi that do not form lichens. In lichens, the biosynthesis of lichexanthone occurs through a set of enzymatic reactions that start with the molecule acetyl-CoA and sequentially add successive units, forming a longe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichens Of East Tropical Africa
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Introduction to Lichens – An Alliance between Kingdoms . University of California Museum of Paleontology. Lichens have properties different from those of their component organisms. They come in many colors, sizes, and forms and are sometimes plant-like, but are not s. They may have tiny, leafless branches (); flat leaf-like structures ( |
.jpg "Click for more on -> Lichexanthone")
