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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] |
Lichen
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 ( |
Parmotrema Tinctorum
''Parmotrema tinctorum'' is a lichen which belongs to the ''Parmotrema ''Parmotrema'' is a genus of lichen belonging to the family Parmeliaceae. It is a large genus, containing an estimated 300 species, with a centre of diversity in subtropical regions of South America and the Pacific Islands. Members of the genus ...'' genus. The lichen is as known as the Palm Ruffle Lichen and is listed as secure by the Nature Conservatory. Description Grows to around 3–30 cm in diameter with board dull smooth slightly shiny gray lobes that are 10–20 mm wide. The underside is black with naked brown areas with a central collection of simple rhizines. Habitat and range Global distribution with a majority of samples being located in North America and Europe. Chemistry Compounds derived from Parmotrema tinctorum have been found to have anti-cancer properties. Environmental monitoring Parmotrema tinctorum has been identified and used as a candidate for monitoring air polluti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benzoic Acids
Benzoic acid is a white (or colorless) solid organic compound with the formula , whose structure consists of a benzene ring () with a carboxyl () substituent. It is the simplest aromatic carboxylic acid. The name is derived from gum benzoin, which was for a long time its only source. Benzoic acid occurs naturally in many plants and serves as an intermediate in the biosynthesis of many secondary metabolites. Salts of benzoic acid are used as food preservatives. Benzoic acid is an important precursor for the industrial synthesis of many other organic substances. The salts and esters of benzoic acid are known as benzoates . History Benzoic acid was discovered in the sixteenth century. The dry distillation of gum benzoin was first described by Nostradamus (1556), and then by Alexius Pedemontanus (1560) and Blaise de Vigenère (1596). Justus von Liebig and Friedrich Wöhler determined the composition of benzoic acid. These latter also investigated how hippuric acid is related ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphenols
Polyphenols () are a large family of naturally occurring organic compounds characterized by multiples of phenol units. They are abundant in plants and structurally diverse. Polyphenols include flavonoids, tannic acid, and ellagitannin, some of which have been used historically as dyes and for tanning garments. Etymology The name derives from the Ancient Greek word (''polus'', meaning "many, much") and the word phenol which refers to a chemical structure formed by attaching to an aromatic benzenoid (phenyl) ring to a hydroxyl (-OH) group as is found in alcohols (hence the ''-ol'' suffix). The term polyphenol has been in use at least since 1894. Definition The term polyphenol is not well-defined, but is generally agreed that they are natural products "having a polyphenol structure (i.e., several hydroxyl groups on aromatic rings)" including four principal classes: "phenolic acids, flavonoids, stilbenes, and lignans". *Flavonoids include flavones, flavonols, flavanols, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 hook-like to thread-like conidia (asexual spores), simple rhizines (root-like structures that attach the lichen thallus to its substrate), and point-like pseudocyphellae (tiny pores on the thallus surface that facilitate gas exchange). It is this last feature that is alluded to in the vernacular names speckled shield lichens or speckleback lichens. ''Punctelia'' lichens grow on bark, wood, and rocks. The genus is cosmopolitan, occurring on all continents but Antarctica. Species are found in temperate to subtropical locations. ''Punctelia'' has centres of distribution in the Neotropics and Africa; about half of the known species occur in South America. The photobiont partners of ''Punctelia'' are green algae in the genus ''Trebouxia''. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xanthoparmelia Lecanorica
''Xanthoparmelia lecanorica'' is a foliose lichen that belongs to the genus ''Xanthoparmelia''. It is noted for being similar in appearance and has often been misidentified as ''Xanthoparmelia arida''. Description ''Xanthoparmelia lecanorica'' grows to around 3–5 cm in diameter with board yellow-green sub irregular lobes that extend 1–2 mm wide. The underside is dark brown to black with simple rhizines approximately 0.2-0.5 mm long. Habitat and range ''Xanthoparmelia lecanorica'' is found in South Africa. At times specimens of ''Xanthoparmelia arida'' have been misidentified in North America as ''Xanthoparmelia lecanorica''. Chemistry ''Xanthoparmelia lecanorica'' has been recorded containing both lecanoric and usnic acid Usnic acid is a naturally occurring dibenzofuran derivative found in several lichen species with the formula C18H16O7. It was first isolated by German scientist W. Knop in 1844 and first synthesized between 1933-1937 by Curd and Rob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xanthoparmelia Arida
''Xanthoparmelia arida'' is a lichen which belongs to the ''Xanthoparmelia'' genus. The lichen is an arid shield lichen and is uncommon it is listed as apparently secure by the Nature Conservatory. It is noted for being similar to '' Xanthoparmelia joranadia''. Description Grows to around 3–8 cm in diameter with board dull yellow-green sub irregular lobes that extend 1–3 mm wide. The underside is pale brown with simple rhizines approximately 0.3-0.6 mm long. Habitat and range Found in the North American southwest particularly in the US state of Texas. Chemistry ''Xanthoparmelia arida'' has been recorded containing both Lecanoric and usnic acid Usnic acid is a naturally occurring dibenzofuran derivative found in several lichen species with the formula C18H16O7. It was first isolated by German scientist W. Knop in 1844 and first synthesized between 1933-1937 by Curd and Robertson. Usnic a ...s. See also * List of ''Xanthoparmelia'' species Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parmotrema Grayana
''Parmotrema'' is a genus of lichen belonging to the family Parmeliaceae. It is a large genus, containing an estimated 300 species, with a centre of diversity in subtropical regions of South America and the Pacific Islands. Members of the genus are commonly called ruffle lichens or scatter-rag lichens.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, Description ''Parmotrema'' is characterized by its typically large, moderately to loosely-attached foliose thallus with broad lobes that are usually more than 5 mm wide. There is a broad, naked zone around the margin of the lower surface, an epicortex with pores and an upper cortex with a palisade- plectenchymatous arrangement of hyphae. Ascospores are thick-walled and ellipsoid. Taxonomy The genus was proposed as a genus by Italian lichenologist Abramo Bartolommeo Massalongo in 1860, with ''Parmotrema perforatum'' as the type species. The genus name, composed of the Greek ''parmos'' (cup) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parmotrema Stuppuem
''Parmotrema stuppuem'' is a corticolous (bark-dwelling), foliose lichen that belongs to the large family Parmeliaceae. The lichen is commonly known as the powder-edged ruffle lichen and is listed as apparently secure by the Nature Conservancy. Description ''Parmotrema stuppuem'' grows to around 2–20 cm in diameter with broad, dull, smooth gray lobes that are 4–8 mm wide. The underside is black and brown with a central collection of simple rhizines. Habitat and range ''Parmotrema stuppuem'' has a pantropical and pantemperate distribution, and is found across North America with a majority of samples being collected in and around the Great Lakes region of the United States. In Mexico, ''P. stuppeum'' is one of the most common foliose lichens found at intermediate to fairly high elevations in the mountains. It also occurs in Europe, southern Africa, southern Asia, and Central America. Chemistry Antioxidants have been extracted from ''Parmotrema stuppuem''. Ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PubChem
PubChem is a database of chemical molecules and their activities against biological assays. The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine, which is part of the United States National Institutes of Health (NIH). PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains multiple substance descriptions and small molecules with fewer than 100 atoms and 1,000 bonds. More than 80 database vendors contribute to the growing PubChem database. History PubChem was released in 2004 as a component of the Molecular Libraries Program (MLP) of the NIH. As of November 2015, PubChem contains more than 150 million depositor-provided substance descriptions, 60 million unique chemical structures, and 225 million biological activity test results (from over 1 million assay experiments performed on more t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Usnea Subvacata
''Usnea'' is a genus of mostly pale grayish-green fruticose lichens that grow like leafless mini-shrubs or tassels anchored on bark or twigs.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, The genus is in the family Parmeliaceae. It grows all over the world. Members of the genus are commonly called old man's beard, beard lichen, or beard moss. Like other lichens it is a symbiosis of two or three fungi and an alga. In ''Usnea'', the fungus belongs to the division Ascomycota, while the alga is a member of the division Chlorophyta. Members of the genus are similar to those of the genus '' Alectoria''. A distinguishing test is that the branches of ''Usnea'' are somewhat elastic, but the branches of ''Alectoria'' snap cleanly off. Systematics The genus ''Usnea'' was circumscribed by Michel Adanson in 1763. He used the name designated by Johann Jacob Dillenius, whose earlier published description did not met the rules of valid publication as es ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lecanora
''Lecanora'' is a genus of lichen commonly called rim lichens.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, Lichens in the genus ''Squamarina'' are also called rim lichens. Members of the genus have roughly circular fruiting discs (apothecia) with rims that have photosynthetic tissue similar to that of the nonfruiting part of the lichen body (thallus). Other lichens with apothecia having margins made of thallus-like tissue are called lecanorine. ''Lecanora'' has a crustose thallus, trebouxoid photobiont, colourless ascospores and crystals in the amphitecium. It is in the family Lecanoraceae in the suborder Lecanorineae. Species : *'' Lecanora campestris'' (Schaer.) Hue 1888 *''Lecanora conizaeoides'' Nyl. ex Cromb. 1885 *'' Lecanora gangaleoides'', Nyl. 1872 *'' Lecanora grantii'', H. Magn. 1932 *''Lecanora helicopis'', (Wahlenb. ex Ach.) Ach. 1814 *'' Lecanora mellea'', W.A.Weber (1975) *''Lecanora muralis'', (Schreb.) Rabenh. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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