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Dirina Mexicana
''Dirina mexicana'' is a species of saxicolous (rock-dwelling), crustose lichen in the family Roccellaceae. First identified in Mexico, it displays distinctive characteristics which set it apart from other species within the same genus. The lichen is unique for its varied hues and certain chemical characteristics that are seen in its thallus, or vegetative tissue. Typically growing on vertical or overhanging rocks and cliffs, ''Dirina mexicana'' can be found in specific regions across Mexico. Taxonomy The species was formally described by Swedish lichenologist in 1995. It is included within the genus ''Dirina'' and shares some common characteristics with other species in the genus, such as '' D. insulana'', '' D. immersa'', and '' D. cretacea''. However, it stands out due to its unique colouration and chemical composition. The type specimen of ''Dirina mexicana'' was found north-northeast of Higuera de Zaragoza in the state of Sinaloa, Mexico, on a hill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saxicolous Lichen
A saxicolous lichen is a lichen that grows on rock. The prefix "sax" from the Latin means "rock" or "stone". Characteristics Saxicolous lichens exhibit very slow growth rates. They may develop on rock substrates for long periods of time, given the absence of external disturbances. The importance of the mineral composition of the rock substrate, as well as the elemental geochemistry Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans. The realm of geochemistry extends beyond the Earth, encompassing the e ... is also important to the distribution of saxicolous lichens, but the relationship between the substrate influence on lichens, either chemical or textural, is still obscure. Communities of saxicolous lichens are often species-rich in terms of number. References Lichenology {{lichen-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micrometre
The micrometre ( international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is a unit of length in the International System of Units (SI) equalling (SI standard prefix "micro-" = ); that is, one millionth of a metre (or one thousandth of a millimetre, , or about ). The nearest smaller common SI unit is the nanometre, equivalent to one thousandth of a micrometre, one millionth of a millimetre or one billionth of a metre (). The micrometre is a common unit of measurement for wavelengths of infrared radiation as well as sizes of biological cells and bacteria, and for grading wool by the diameter of the fibres. The width of a single human hair ranges from approximately 20 to . The longest human chromosome, chromosome 1, is approximately in length. Examples Between 1 μm and 10 μm: * 1–10 μm – length of a typical bacterium * 3–8 μm – width of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichen Species
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 ( |
Corticolous Lichen
A corticolous lichen is a lichen that grows on bark.Alan Silverside's Lichen Glossary (a-f), Alan Silverside/ref> This is contrasted with lignicolous lichen, which grows on wood that has had the bark stripped from it,Alan Silverside's Lichen Glossary (g-o), Alan Silverside/ref> and saxicolous lichen, which grows on rock.Alan Silverside's Lichen Glossary (p-z), Alan Silverside/ref> Examples of corticolous lichens include the crustose lichen ''Graphis plumierae'', foliose lichen ''Melanohalea subolivacea'' and the fruticose ''Bryoria fuscescens ''Bryoria fuscescens'' is a species of lichen of the family Parmeliaceae. As of July 2021, its conservation status has not been estimated by the IUCN. In Iceland, where it grows as an epiphyte on downy birch stems and branches, it is classified ...''.Náttúrufræðistofnun Íslands celandic Institute of Natural History(1996). Válisti 1: Plöntur.' (in Icelandic) Reykjavík: Náttúrufræðistofnun Íslands. References Lichenolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirina Pallescens
''Dirina pallescens'' is a species of corticolous (bark-dwelling), crustose lichen in the family Roccellaceae. Found in Mexico, it was formally described as a new species in 2013 by Anders Tehler and Damien Ertz. The type specimen was collected by the first author near Todos Santos, Baja California Sur. It has also been recorded from Sonora and Oaxaca, growing near the sea on various trees and shrubs, including '' Bursera'' and mangrove. The species epithet alludes to its pale thallus, which is usually creamy white to white-brownish in colour. ''Dirina pallescens'' contains the lichen products erythrin, lecanoric acid Lecanoric acid is a chemical produced by several species of lichen.ubChem - Lecanoric acid"> Lecanoric acid is classified as a polyphenol and a didepside and it functions as an antioxidant. The acid is named after the lichen ''Lecanora''. The acid ..., and two unidentified substances named "B" and "C". References pallescens Lichen species Lichens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sessility (botany)
In botany, sessility (meaning "sitting", used in the sense of "resting on the surface") is a characteristic of plant parts (such as flowers and leaves) that have no stalk. Plant parts can also be described as subsessile, that is, not completely sessile. A sessile flower is one that lacks a pedicel (flower stalk). A flower that is not sessile is pedicellate. For example, the genus ''Trillium'' is partitioned into two subgenera, the sessile-flowered trilliums (''Trillium'' subg. ''Sessilium'') and the pedicellate-flowered trilliums. Sessile leaves lack petioles (leaf stalks). A leaf that is not sessile is petiolate. For example, the leaves of most monocotyledons lack petioles. The term sessility is also used in mycology to describe a fungal fruit body that is attached to or seated directly on the surface of the substrate, lacking a supporting stipe or pedicel Pedicle or pedicel may refer to: Human anatomy *Pedicle of vertebral arch, the segment between the transvers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirina Catalinariae
''Dirina catalinariae'' is a species of saxicolous (rock-dwelling), crustose lichen in the family Roccellaceae. It occurs in the southwestern United States, Mexico, and the Galápagos Islands. Taxonomy The lichen was formally described as a new species in 1911 by Hermann Edward Hasse. The type specimen was collected on Catalina Island, where it was found growing on beach boulders near Avalon; the species epithet refers to its type locality. In 2013, Anders Tehler proposed the form ''Dirina catalinariae'' f. ''sorediata'' from specimens collected in Mexico, but this taxon is no longer considered to have independent taxonomic significance. Description The lichen has a creamy white to greyish crustose thallus with a roughened surface texture that at times is nearly squamulose or somewhat fruticose. Soralia and ascomata often appear side-by-side on the thallus; it is the only member of ''Dirina'' in which sexual (fertile) and asexual (sterile) morphs are not different ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mosaic
A mosaic is a pattern or image made of small regular or irregular pieces of colored stone, glass or ceramic, held in place by plaster/mortar, and covering a surface. Mosaics are often used as floor and wall decoration, and were particularly popular in the Ancient Roman world. Mosaic today includes not just murals and pavements, but also artwork, hobby crafts, and industrial and construction forms. Mosaics have a long history, starting in Mesopotamia in the 3rd millennium BC. Pebble mosaics were made in Tiryns in Mycenean Greece; mosaics with patterns and pictures became widespread in classical times, both in Ancient Greece and Ancient Rome. Early Christian basilicas from the 4th century onwards were decorated with wall and ceiling mosaics. Mosaic art flourished in the Byzantine Empire from the 6th to the 15th centuries; that tradition was adopted by the Norman Kingdom of Sicily in the 12th century, by the eastern-influenced Republic of Venice, and among the Rus. Mosaic fell ou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cabo San Lucas
Cabo San Lucas (, "Saint Luke Cape"), or simply just Cabo, is a resort city at the southern tip of the Baja California Peninsula, in the Mexican state of Baja California Sur. As at the 2020 Census, the population of the city was 202,694 inhabitants.2020 Census of Mexico. Cabo San Lucas together with the famous San José del Cabo are collectively known as Los Cabos. Together, they form a metropolitan area of 351,111 inhabitants.2020 Census of Mexico. Rated as one of Mexico's top five tourist destinations, Cabo is known for its beaches, scuba diving locations, Balnearios, the sea arch El Arco de Cabo San Lucas, and marine life. The Los Cabos Corridor has become a heavily trafficked vacation destination for tourists, with numerous resorts and timeshares along the coast between Cabo San Lucas and San José del Cabo. The waters around Cabo are home to marine wildlife including rays, sharks, mahi-mahi (dorado), and striped marlin. History Archaeological excavations have shown evidenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baja California
Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mexico. Before becoming a state in 1952, the area was known as the North Territory of Baja California (). It has an area of (3.57% of the land mass of Mexico) and comprises the northern half of the Baja California Peninsula, north of the 28th parallel, plus oceanic Guadalupe Island. The mainland portion of the state is bordered on the west by the Pacific Ocean; on the east by Sonora, the U.S. state of Arizona, and the Gulf of California; on the north by the U.S. state of California; and on the south by Baja California Sur. The state has an estimated population of 3,769,020 as of 2020, significantly higher than the sparsely populated Baja California Sur to the south, and similar to San Diego County, California, to its north. Over 75% of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lecanoric Acid
Lecanoric acid is a chemical produced by several species of lichen.ubChem - Lecanoric acid"> Lecanoric acid is classified as a polyphenol and a didepside and it functions as an antioxidant. The acid is named after the lichen ''Lecanora''. The acid has also been isolated from ''Usnea subvacata'', ''Parmotrema stuppuem'', ''Parmotrema tinctorum,'' '' Parmotrema grayana,'' Xanthoparmelia arida and Xanthoparmelia lecanorica. A related compound, 5-chlorolecanoric acid, is found in some species of ''Punctelia ''Punctelia'' is a genus of foliose lichens belonging to the large family Parmeliaceae. The genus, which contains about 50 species, was segregated from genus ''Parmelia'' in 1982. Characteristics that define ''Punctelia'' include the presence of ...''. References {{Reflist Polyphenols Benzoic acids Benzoate esters Lichen products ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orsellinic Acid
Orsellinic acid, more specifically ''o''-orsellinic acid, is a phenolic acid. It is of importance in the biochemistry of lichens, from which it can be extracted. It is a common subunit of depsides. Chemistry It can be prepared by the oxidation of orsellaldehyde. This is also produced when everninic acid and ramalic acid is boiled with barium hydroxide Barium hydroxide is a chemical compound with the chemical formula Ba(OH)2. The monohydrate (''x'' = 1), known as baryta or baryta-water, is one of the principal compounds of barium. This white granular monohydrate is the usual commercial form. .... It forms colorless crystals in the form of needles which on rapid heating melt with decomposition in the neighborhood of 175 °C. [Sep 22, 2021: this citation to J Chromatog 511 needs to be revised because that paper makes no reference to crystals of orsellinic acid nor its melting point. In fact, the text never specifically mentions orsellinic acid: it simply appear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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