|
Parmotrema Lichexanthonicum
''Parmotrema lichexanthonicum'' is a species of foliose lichen in the family Parmeliaceae. Found in Brazil, it was formally described as a new species in 1997 by Sionara Eliasaro and Mónica Adler. The type specimen was collected by the first author from the Serra do Cipó (Santana do Riacho, Minas Gerais); here the lichen was found growing on a rock. The specific epithet ''lichexanthonicum'' refers to the presence of the secondary compound lichexanthone in the medulla of the lichen. Other compounds in the lichen are the depsidone salazinic acid (found in the medulla), and the depside A depside is a type of polyphenolic compound composed of two or more monocyclic aromatic units linked by an ester bond. Depsides are most often found in lichens, but have also been isolated from higher plants, including species of the Ericaceae, L ... atranorin (found in the cortex). A close relative to this species is '' Parmotrema ultralucens'', which contains the same cortical and med ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foliose Lichen
Foliose lichen is one of the morphological classes of lichens, which are complex organisms that arise from the symbiotic relationship between fungi and a photosynthetic partner, typically algae. This partnership allows lichen to live in diverse climates that can range from cold, dry mountains to wet, warm valleys. Lichens develop quite slowly with recorded growth rates of 0.01–27mm/year depending on the species. Their lifespan averages between 30 and 60 years. Lichens have a main body part called the thallus, which is composed of hyphae, and houses the cortex and medulla. The cortex contains the photosynthetic cells while the medulla allows for gas exchange and makes up the bulk of the lichen's thallus. There are three main types of lichens: crustose, foliose, and fruticose. Foliose lichen are characterised by flattened leafy thalli, and an upper and lower cortex. Many have numerous layers, which are stratified, and aid in identifying different types. Foliose lichens attach to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depsidone
Depsidones (+ "depside" + "one") are chemical compounds that are sometimes found as secondary metabolites in lichens. They are esters that are both depsides and cyclic ethers. An example is norstictic acid Norstictic acid is a depsidone produced as a secondary metabolite Secondary metabolites, also called specialised metabolites, toxins, secondary products, or natural products, are organic compounds produced by any lifeform, e.g. bacteria, fun .... References {{reflist Biochemistry Carboxylate esters ... [...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 ( |
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 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) an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Parmotrema Species
This is a list of species in the lichen genus ''Parmotrema''. A 2016 estimate places about 300 species in the genus. A *'' Parmotrema aberrans'' (Vain.) Canêz & Marcelli (2008) *'' Parmotrema abessinicum'' (Kremp.) Hale (1974) *'' Parmotrema abnuens'' (Nyl.) Hale (1974) *'' Parmotrema acrotrychum'' (Kurok.) Streimann (1986) *'' Parmotrema adspersum'' (Vain.) Elix (2002) *'' Parmotrema afrocetratum'' Elix, Eb.Fischer & Killmann (2005) – Rwanda *'' Parmotrema albinatum'' (K.H.Moon, Kurok. & Kashiw.) O.Blanco, A.Crespo, Divakar, Elix & Lumbsch (2005) *'' Parmotrema aldabrense'' (C.W.Dodge) Hale (1974) *'' Parmotrema alectoronicum'' C.H.Ribeiro & Marcelli (2002) – Brazil *'' Parmotrema alidactylatum'' Estrabou & Adler (1998) – Argentina *'' Parmotrema amaniense'' (J.Steiner & Zahlbr.) Krog & Swinscow (1983) *'' Parmotrema amboimense'' (C.W.Dodge) Hale (1974) *'' Parmotrema anchietanum'' Marcelli, Benatti & Elix (2008) – Brazil *'' Parmotrema andinum'' (Müll.Arg.) Hale (197 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parmotrema Ultralucens
''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'' (c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cortex (botany)
In botany, a cortex is an outer layer of a stem or root in a vascular plant, lying below the epidermis but outside of the vascular bundles. The cortex is composed mostly of large thin-walled parenchyma cells of the ground tissue system and shows little to no structural differentiation. The outer cortical cells often acquire irregularly thickened cell walls, and are called collenchyma cells. Plants Stems and branches In the three dimensional structure of herbaceous stems, the epidermis, cortex and vascular cambium form concentric cylinders around the inner cylindrical core of pith. Some of the outer cortical cells may contain chloroplasts, giving them a green color. They can therefore produce simple carbohydrates through photosynthesis. In woody plants, the cortex is located between the periderm (bark) and the vascular tissue (phloem, in particular). It is responsible for the transportation of materials into the central cylinder of the root through diffusion and may als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atranorin
Atranorin is a chemical substance produced by some species of lichen. It is a secondary metabolite belonging to a group of compounds known as depsides. Atranorin has analgesic, anti-inflammatory, antibacterial, antifungal, cytotoxic, antioxidant, antiviral, and immunomodulatory properties. In rare cases, people can react allergic Allergies, also known as allergic diseases, refer a number of conditions caused by the hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic derma ... to atranorin. References Further reading * * * * Polyphenols Lichen products {{organic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depside
A depside is a type of polyphenolic compound composed of two or more monocyclic aromatic units linked by an ester bond. Depsides are most often found in lichens, but have also been isolated from higher plants, including species of the Ericaceae, Lamiaceae, Papaveraceae and Myrtaceae. Certain depsides have antibiotic, anti- HIV, antioxidant, and anti-proliferative activity ''in vitro''. As inhibitors of prostaglandin synthesis and leukotriene B4 biosynthesis, some depsides have ''in vitro'' anti-inflammatory activity. A depsidase is a type of enzyme that cuts depside bonds. One such enzyme is tannase. Examples Gyrophoric acid, found in the lichen '' Cryptothecia rubrocincta'', is a depside. Merochlorophaeic acid, isolated from lichens of the genus '' Cladonia'', is an inhibitor of prostaglandin synthesis. Some depsides are described as anti-HIV. See also *Salsalate homodimer formed from self-condensation of salicylic acid Salicylic acid is an organic compound with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salazinic Acid
Salazinic acid is a depsidone with a lactone ring. It is found in some lichens, and is especially prevalent in ''Parmotrema'' and ''Bulbothrix'', where its presence or absence is often used to help classify species in those genera. History In 1897, Friedrich Wilhelm Zopf named the chemical he originally isolated from the African species '' Stereocaulon salazinum'' as salazinic acid. Later studies showed that the compound he named was actually norstictic acid. In 1933, Yasuhiko Asahina and J. Asano studied salazinic acid they had isolated from '' Parmelia cetrata'', and found a unique ring system with seven members containing two phenolic components. The fundamental structure was named depsidone, that is, a seven-membered ring with an oxygen bridge binding two aromatic rings. Japanese chemists demonstrated in the late 1960s that the isolated mycobiont of the lichen '' Ramalina crassa'' could produce salazinic acid when grown in laboratory culture. Subsequent studies tried ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medulla (lichenology)
The medulla is a horizontal layer within a lichen thallus. It is a loosely arranged layer of interlaced hyphae below the upper cortex and photobiont A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Galloway, D.J. (1992). Flora of Australia - ''Lichen Glossary'' The medulla generally has a cottony appearance. It is the widest layer of a heteromerous lichen thallus. References Fungal morphology and anatomy Lichenology {{lichen-stub ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parmeliaceae
The Parmeliaceae is a large and diverse family of Lecanoromycetes. With over 2700 species in 71 genera, it is the largest family of lichen-forming fungi. The most speciose genera in the family are the well-known groups: '' Xanthoparmelia'' ( 822 species), ''Usnea'' (355 species), ''Parmotrema'' ( 255 species), and ''Hypotrachyna'' (262 species). Nearly all members of the family have a symbiotic association with a green alga (most often ''Trebouxia'' spp., but '' Asterochloris'' spp. are known to associate with some species).Miadlikowska, J. ''et al.'' (2006). New insights into classification and evolution of the Lecanoromycetes (Pezizomycotina, Ascomycota) from phylogenetic analyses of three ribosomal RNA- and two protein-coding genes. ''Mycologia'' 98: 1088-1103. http://www.mycologia.org/cgi/reprint/98/6/1088.pdf The majority of Parmeliaceae species have a foliose, fruticose, or subfruticose growth form. The morphological diversity and complexity exhibited by this group is en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
