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Bullseye Lichen
''Placopsis'' (bullseye lichen) is a genus of lichenized fungi in the family Trapeliaceae. ''Placopsis'' Morphology Most species of the ''Placopsis'' genus are characterized by a voluminous thallus. Also distinctive to ''Palcopsis'' species are the characteristic radial patterns formed by distinct lobes in the center of the thallus. These radial patterns range in size but can span from the center to the very margin of the thallus. The morphology of the lichen reveals its symbiotic relationship with its photobionts. The center of the lichenscephalodia structure houses colonies of cyanobacteria and the outer margins of the structure houses algal photobionts, the Placopsis antarctica showing a clear example of this type of morphological structure. ''Placopsis'' and ''Trapelia'' Comparative Phylogeny The 60 or more species within the ''Placopsis'' genus are typically competitive strategists - they inhabit oligotrophic environments to ensure space for growth and little dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placopsis Lambii
''Placopsis lambii'' is a species of saxicolous lichen, saxicolous (rock-dwelling), crustose lichen in the family Trapeliaceae. It was species description, formally described as a new species in 1987 by lichenologists Hannes Hertel and Volkmar Wirth. The botanical name, species epithet ''lambii'' honours polar explorer and lichenologist Elke Mackenzie (formerly Lamb). In North America, one vernacular name for the lichen is pink bull's-eye lichen. ''Placopsis lambii'' is distinguished by its thallus that features deeply notched and radiating edge , a glossy upper surface, typically dark and somewhat rounded soralia, and non-lobate cephalodia that may be absent in certain samples. This species predominantly produces 5-O-methylhiascic, 5-''O''-methylhiascic and gyrophoric acids. ''Placopsis lambii'' has a widespread but scattered distribution. It has been recorded from many countries in Europe, Africa (Kenya, Lesotho, and Tanzania), South America (Bolivia, Chile), Central America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen Fixation
Nitrogen fixation is a chemical process by which molecular dinitrogen () is converted into ammonia (). It occurs both biologically and abiological nitrogen fixation, abiologically in chemical industry, chemical industries. Biological nitrogen fixation or ''diazotrophy'' is catalyzed by enzymes called nitrogenases. These enzyme complexes are encoded by the Nif gene, ''Nif'' genes (or ''Nif'' homologs) and contain iron, often with a second metal (usually molybdenum, but sometimes vanadium). Some nitrogen-fixing bacteria have symbiotic relationships with plants, especially legumes, mosses and aquatic ferns such as ''Azolla''. Looser non-symbiotic relationships between diazotrophs and plants are often referred to as associative, as seen in nitrogen fixation on rice roots. Nitrogen fixation occurs between some termites and fungus, fungi. It occurs naturally in the air by means of NOx, NOx production by lightning. Fixed nitrogen is essential to life on Earth. Organic compounds such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Placopsis Centrifuga
''Placopsis'' (bullseye lichen) is a genus of lichenized fungi in the family Trapeliaceae. ''Placopsis'' Morphology Most species of the ''Placopsis'' genus are characterized by a voluminous thallus. Also distinctive to ''Palcopsis'' species are the characteristic radial patterns formed by distinct lobes in the center of the thallus. These radial patterns range in size but can span from the center to the very margin of the thallus. The morphology of the lichen reveals its symbiotic relationship with its photobionts. The center of the lichenscephalodia structure houses colonies of cyanobacteria and the outer margins of the structure houses algal photobionts, the Placopsis antarctica showing a clear example of this type of morphological structure. ''Placopsis'' and ''Trapelia'' Comparative Phylogeny The 60 or more species within the ''Placopsis'' genus are typically competitive strategists - they inhabit oligotrophic environments to ensure space for growth and little dist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catalog Of Life
The Catalogue of Life (CoL) is an online database that provides an index of known species of animals, plants, fungi, and microorganisms. It was created in 2001 as a partnership between the global Species 2000 and the American Integrated Taxonomic Information System. The Catalogue is used by research scientists, citizen scientists, educators, and policy makers. The Catalogue is also used by the Biodiversity Heritage Library, the Barcode of Life Data System, ''Encyclopedia of Life'', and the Global Biodiversity Information Facility. The Catalogue currently compiles data from 165 peer-reviewed taxonomic databases that are maintained by specialist institutions around the world. the COL Checklist lists 2,067,951 of the world's 2.2m extant species known to taxonomists on the planet at present time. Structure The Catalogue of Life employs a simple data structure to provide information on synonymy, grouping within a taxonomic hierarchy, common names, distribution and ecological environ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species Fungorum
''Index Fungorum'' is an international project to index all formal names (Binomial nomenclature, scientific names) in the fungus Kingdom (biology), kingdom. As of 2015, the project is based at the Royal Botanic Gardens, Kew, one of three partners along with Landcare Research New Zealand Limited, Landcare Research and the Institute of Microbiology, Chinese Academy of Sciences. It is somewhat comparable to the International Plant Names Index (IPNI), in which the Royal Botanic Gardens is also involved. A difference is that where IPNI does not indicate Correct name (botany), correct names, the ''Index Fungorum'' does indicate the status of a name. In the returns from the search page, a currently correct name is indicated in green, while others are in blue (a few, aberrant usages of names are indicated in red). All names are linked to pages giving the correct name, with lists of Synonym (taxonomy), synonyms. ''Index Fungorum'' is one of three nomenclatural repositories recognized b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vascular Plant
Vascular plants (), also called tracheophytes (, ) or collectively tracheophyta (; ), are plants that have lignin, lignified tissues (the xylem) for conducting water and minerals throughout the plant. They also have a specialized non-lignified Tissue (biology), tissue (the phloem) to conduct products of photosynthesis. The group includes most embryophyte, land plants ( accepted known species) excluding mosses. Vascular plants include the clubmosses, Equisetum, horsetails, ferns, gymnosperms (including conifers), and angiosperms (flowering plants). They are contrasted with nonvascular plants such as mosses and green algae. Scientific names for the vascular plants group include Tracheophyta, Tracheobionta and Equisetopsida sensu lato, Equisetopsida ''sensu lato''. Some early land plants (the rhyniophytes) had less developed vascular tissue; the term eutracheophyte has been used for all other vascular plants, including all living ones. Historically, vascular plants were known as "hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Braided River
A braided river (also called braided channel or braided stream) consists of a network of river channel (geography), channels separated by small, often temporary, islands called ''braid bars'' or, in British English usage, ''aits'' or ''eyots''. Braided streams tend to occur in rivers with high sediment loads or coarse grain sizes, and in rivers with steeper Stream slope, slopes than typical rivers with straight or meandering channel patterns. They are also associated with rivers with rapid and frequent variation in the amount of water they carry, i.e., with "Flash flood, flashy" rivers, and with rivers with weak River bank, banks. Braided channels are found in a variety of environments all over the world, including gravelly mountain streams, sand bed rivers, on alluvial fans, on river deltas, and across depositional plains. Description A braided river consists of a network of multiple shallow channels that diverge and rejoin around ephemeral ''braid bars''. This gives the river ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
