|
Punctelia Borrerina
''Punctelia borrerina'' is a species of foliose lichen in the family Parmeliaceae. It is found in Mexico and South America. Taxonomy The lichen was first formally described as ''Parmelia borrerina'' by Finnish botanist William Nylander in 1896. The type specimens were collected in Rio Grande do Sul, Brazil. Nylander described the species as somewhat similar to ''Parmelia borreri'' (now the type species of ''Punctelia''), but with different chemistry: in ''P. borrerina'', the medulla has C− and KC− spot test reactions, while ''P. borreri'' is C+. Hildur Krog transferred ''Parmelia borrerina'' to the new genus ''Punctelia'' in 1982. ''Punctelia borreri'' var. ''allophylla'' is considered to be a synonym of ''P. borrerina''. Description ''Punctelia borrerina'' produces ascospores that are less than 20 μm long, and long-filiform (threadlike) conidia that are typically 10–15 μm long. The lichen is a member of the ''Punctelia microsticta'' gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hildur Krog
Hildur Krog (22 March 1922 – 25 August 2014) was a Norwegian botanist. She was born in Modum. She took the dr.philos. degree in 1968 with a thesis on Alaskan lichens, was hired as a curator at the Botanical Museum of Oslo in 1971 and served as professor at the University of Oslo from 1987 to 1992. For 15 year from 1969 she collaborated with the British amateur lichenologist Dougal Swinscow to study the macrolichen flora of East Africa. They undertook field collections as well as characterisation and revision of the limited existing lichen knowledge of the region, presented in 33 scientific publications and a book ''The Macrolichens of East Africa'', British Museum (Natural History) in 1988. In 1992 Hildur Krog was awarded the Acharius Medal by the International Association for Lichenology She was a fellow of the Norwegian Academy of Science and Letters. She died in 2014. Several lichen are named in her honour, including ''Krogia'' which a genus of corticolous lichens in the ... [...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 � ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichens Described In 1986
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 ( |
Veracruz
Veracruz (), formally Veracruz de Ignacio de la Llave (), officially the Free and Sovereign State of Veracruz de Ignacio de la Llave ( es, Estado Libre y Soberano de Veracruz de Ignacio de la Llave), is one of the 31 states which, along with Mexico City, comprise the 32 Federal Entities of Mexico. It is located in eastern Mexico and is bordered by seven states, which are Tamaulipas, San Luis Potosí, Hidalgo, Puebla, Oaxaca, Chiapas, and Tabasco. Veracruz is divided into 212 municipalities, and its capital city is Xalapa-Enríquez. Veracruz has a significant share of the coastline of the Gulf of Mexico on the east of the state. The state is noted for its mixed ethnic and indigenous populations. Its cuisine reflects the many cultural influences that have come through the state because of the importance of the port of Veracruz. In addition to the capital city, the state's largest cities include Veracruz, Coatzacoalcos, Córdoba, Minatitlán, Poza Rica, Boca Del Río and Oriz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tamaulipas
Tamaulipas (), officially the Free and Sovereign State of Tamaulipas ( es, Estado Libre y Soberano de Tamaulipas), is a state in the northeast region of Mexico; one of the 31 states which, along with Mexico City, comprise the 32 Federal Entities of Mexico. It is divided into 43 municipalities. Tamaulipas is bordered by the states of Nuevo León to the west, San Luis Potosí to the southwest, and Veracruz to the southeast. To the north, it has a stretch of the U.S.–Mexico border with the state of Texas, and to the east it is bordered by the Gulf of Mexico. In addition to the capital city, Ciudad Victoria, the state's largest cities include Reynosa, Matamoros, Nuevo Laredo, Tampico, and Mante. Etymology The name Tamaulipas is derived from ''Tamaholipa'', a Huastec term in which the ''tam-'' prefix signifies "place (where)". No scholarly agreement exists on the meaning of ''holipa'', but "high hills" is a common interpretation. Another explanation of the state nam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Luis Potosí
San Luis Potosí (), officially the Free and Sovereign State of San Luis Potosí ( es, Estado Libre y Soberano de San Luis Potosí), is one of the 32 states which compose the Federal Entities of Mexico. It is divided in 58 municipalities and its capital city is San Luis Potosí City. Located in Central Mexico, San Luis Potosí is bordered by seven other Mexican states: Nuevo León to the north; Tamaulipas to the north-east; Veracruz to the east; Hidalgo, Querétaro and Guanajuato to the south; and Zacatecas to north-west. In addition to the capital city, other major cities in the state include Ciudad Valles, Matehuala, Rioverde, and Tamazunchale. History In pre-Columbian times, the territory now occupied by the state of San Luis Potosí contained parts of the cultural areas of Mesoamerica and Aridoamerica. Its northern and western-central areas were inhabited by the Otomi and Chichimeca tribes. These indigenous groups were nomadic hunter-gatherers. Although many indi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctelia Subpraesignis
''Punctelia subpraesignis'' is a species of foliose lichen in the family Parmeliaceae. It occurs in Mexico, South America, and East Africa, where it grows on bark and on rocks. Major characteristics of the lichen that distinguish it from other ''Punctelia'' species include the C+ and KC+ rose spot tests of the medulla (indicating the presence of gyrophoric acid), ascospores that are smaller than 20 μm, and unciform (hooklike) conidia. Taxonomy It was first described as a new species by Finnish lichenologist William Nylander in 1896, from specimens collected in Argentina. In 1982, Hildur Krog transferred it to ''Punctelia'', a genus she circumscribed to contain '' Parmelia'' species with pseudocyphellae. Description The greenish-gray thallus of ''Punctelia subpraesignis'' is in diameter. It comprises irregularly branched, overlapping lobes that are wide. The texture of the thallus surface ranges from smooth to wrinkled. Vegetative propagules such as lacinulae, macu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctelia Riograndensis
''Punctelia riograndensis'' is a species of foliose lichen in the family Parmeliaceae. Found in Africa and South America, it was formally described as a new species by Norwegian lichenologist Bernt Lynge in 1914, as ''Parmelia riograndensis''. The type specimen was collected in 1892 from Porto Alegre Municipality in Rio Grande do Sul State (Brazil) by Swedish lichenologist Gustav Malme. In 1982, Hildur Krog circumscribed the genus ''Punctelia'' to contain ''Parmelia'' species with rounded pseudocyphellae, and ''P. riograndensis'' was one of the 22 species that she transferred to the new genus. The lichen has a greenish-gray thallus measuring wide, and which is closely attached (adnate) to its substrate (tree bark). The lobes that comprise the thallus are crowded, sometimes overlapping, and measure wide. Pseudocyphellae on the thallus surface are abundant. The medulla is white. The lower thallus surface is either white, or variegated with black and white. It does not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctelia Jujensis
''Punctelia jujensis'' is a species of foliose lichen in the family Parmeliaceae. It is found in Argentina and Brazil. Taxonomy The lichen was described as a new species by Argentinian lichenologist Mónica Adler in 1989. The type specimen was collected near the Yala River in Jujuy Province (Argentina), where it was found growing on the bark of a ''Populus'' tree on the side of a road. ''Punctelia jujensis'' is a member of a group of similar ''Punctelia'' species with a black lower surface and lacking soredia, isidia, lobules or lacinules; they are known as the "''Punctelia microsticta''-group". Description The lichen has a light to dark grey thallus up to in diameter comprising lobes with somewhat rounded tips that measure wide. Pseudocyphellae are sparse and minute (less than 0.2 mm in diameter), and are evenly distributed on the thallus surface. The lichen does make any vegetative propagules–lobulae, squamules, soredia, nor isidia. The medulla is white, while the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propagule
In biology, a propagule is any material that functions in propagating an organism to the next stage in its life cycle, such as by dispersal. The propagule is usually distinct in form from the parent organism. Propagules are produced by organisms such as plants (in the form of seeds or spores), fungi (in the form of spores), and bacteria (for example endospores or microbial cysts). In disease biology, pathogens are said to generate infectious propagules, the units that transmit a disease. These can refer to bacteria, viruses, fungi, or protists, and can be contained within host material. For instance, for influenza, the infectious propagules are carried in droplets of host saliva or mucus that are expelled during coughing or sneezing. In horticulture, a propagule is any plant material used for the purpose of plant propagation. In asexual reproduction, a propagule is often a stem cutting. In some plants, a leaf section or a portion of root can be used. In sexual reproduction, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thallus
Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or " twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms were previously known as the thallophytes, a polyphyletic group of distantly related organisms. An organism or structure resembling a thallus is called thalloid, thallodal, thalliform, thalline, or thallose. A thallus usually names the entire body of a multicellular non-moving organism in which there is no organization of the tissues into organs. Even though thalli do not have organized and distinct parts ( leaves, roots, and stems) as do the vascular plants, they may have analogous structures that resemble their vascular "equivalents". The analogous structures have similar function or macroscopic structure, but different microscopic structure; for example, no thallus has vascular tissue. In exceptional cases such as the Lemnoid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Veracruz"){kind=logo}
.svg "Click for more on -> San Luis Potosí"){kind=logo}
