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Hymeneliaceae
Hymeneliaceae is a family of lichen-forming fungi in the order Baeomycetales. It contains three genera and about 40 species. The family was circumscribed by German lichenologist Gustav Wilhelm Körber in 1855. Lichens in the Hymeneliaceae are saxicolous (rock-dwelling) and crustose, occurring predominantly in the cool-temperate climates to subarctic climates of both the Northern and Southern hemispheres. Genera *''Hymenelia ''Hymenelia'' is a genus of lichen-forming fungi belonging to the family Hymeneliaceae. Collectively, the genus has a cosmopolitan distribution. Species *'' Hymenelia aigneri'' *'' Hymenelia ceracea'' *'' Hymenelia cyanocarpa'' *'' Hymenelia ...'' – 26 spp. *'' Ionaspis'' – 7 spp. *'' Tremolecia'' – 6 spp. References Baeomycetales Lecanoromycetes families Lichen families Taxa named by Gustav Wilhelm Körber Taxa described in 1855 {{Lecanoromycetes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baeomycetales
The Baeomycetales are an order of mostly lichen-forming fungi in the subclass Ostropomycetidae, in the class Lecanoromycetes. It contains 8 families, 33 genera and about 170 species. As a result of molecular phylogenetics research published in the late 2010s, several orders were folded into the Baeomycetales, resulting in a substantial increase in the number of taxa. Taxonomy The family Baeomycetaceae was originally proposed by Barthélemy Charles Joseph Dumortier in 1829 (under the spelling ''Baeomyceae''); he included two genera, ''Baeomyces'' and ''Calicium''. Baeomycetaceae was initially classified in the Lecanorales, and Baeomycetaceae and Cladoniaceae were thought to be closely related, sharing a phylogenetic origin in Lecideaceae. It was transferred to the order Helotiales based on the structure of its ascus, which is similar to those in genus '' Leotia''. However, the Helotiales consists of mostly non-lichenised fungi. The first DNA studies conducted with ''Baeomyces' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenelia
''Hymenelia'' is a genus of lichen-forming fungi belonging to the family Hymeneliaceae. Collectively, the genus has a cosmopolitan distribution. Species *'' Hymenelia aigneri'' *'' Hymenelia ceracea'' *'' Hymenelia cyanocarpa'' *'' Hymenelia epulotica'' *'' Hymenelia glacialis'' *'' Hymenelia grossa'' *'' Hymenelia gyalectoidea'' *'' Hymenelia heteromorpha'' *'' Hymenelia macrospora'' *'' Hymenelia melanocarpa'' *'' Hymenelia microcarpa'' – Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouzet ... *'' Hymenelia parva'' *'' Hymenelia prevostii'' *'' Hymenelia rhodopis'' References Lecanoromycetes Lecanoromycetes genera Lichen genera Taxa described in 1852 Taxa named by August von Krempelhuber {{Lecanoromycetes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circumscription (taxonomy)
In biological taxonomy, circumscription is the content of a taxon, that is, the delimitation of which subordinate taxa are parts of that taxon. If we determine that species X, Y, and Z belong in Genus A, and species T, U, V, and W belong in Genus B, those are our circumscriptions of those two genera. Another systematist might determine that T, U, V, W, X, Y, and Z all belong in genus A. Agreement on circumscriptions is not governed by the Codes of Zoological or Botanical Nomenclature, and must be reached by scientific consensus. A goal of biological taxonomy is to achieve a stable circumscription for every taxon. This goal conflicts, at times, with the goal of achieving a natural classification that reflects the evolutionary history of divergence of groups of organisms. Balancing these two goals is a work in progress, and the circumscriptions of many taxa that had been regarded as stable for decades are in upheaval in the light of rapid developments in molecular phylogene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lichen Families
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 ( |
Lecanoromycetes Families
Lecanoromycetes is the largest class of lichenized fungi. It belongs to the subphylum Pezizomycotina Pezizomycotina make up most of the Ascomycota fungi and include most lichenized fungi too. Pezizomycotina contains the filamentous ascomycetes and is a subdivision of the Ascomycota (fungi that form their spores in a sac-like ''ascus''). It is m ... in the phylum Ascomycota. The asci ( spore-bearing cells) of the Lecanoromycetes most often release spores by rostrate dehiscence. Genera of uncertain placement The are several genera in the Lecanoromycetes that have not been placed into any order or family. These are: *'' Argopsis'' – 1 sp. *'' Ascographa'' - 1 sp. *'' Bartlettiella'' – 1 sp. *'' Bouvetiella'' – 1 sp. *'' Buelliastrum'' – 1 sp. *'' Haploloma'' – 1 sp. *'' Hosseusia'' – 3 spp. *'' Korfiomyces'' – 1 sp. *'' Maronella'' – 1 sp. *'' Notolecidea'' – 1 sp. *'' Petractis'' – 3 spp. *'' Piccolia'' – 10 spp. *'' Ravenelula'' – 2 spp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subarctic Climate
The subarctic climate (also called subpolar climate, or boreal climate) is a climate with long, cold (often very cold) winters, and short, warm to cool summers. It is found on large landmasses, often away from the moderating effects of an ocean, generally at latitudes from 50° to 70°N, poleward of the humid continental climates. Subarctic or boreal climates are the source regions for the cold air that affects temperate latitudes to the south in winter. These climates represent Köppen climate classification ''Dfc'', ''Dwc'', ''Dsc'', ''Dfd'', ''Dwd'' and ''Dsd''. Description This type of climate offers some of the most extreme seasonal temperature variations found on the planet: in winter, temperatures can drop to below and in summer, the temperature may exceed . However, the summers are short; no more than three months of the year (but at least one month) must have a 24-hour average temperature of at least to fall into this category of climate, and the coldest month should a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperate Climate
In geography, the temperate climates of Earth occur in the middle latitudes (23.5° to 66.5° N/S of Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ranges throughout the year and more distinct seasonal changes compared to tropical climates, where such variations are often small and usually only have precipitation changes. In temperate climates, not only do latitudinal positions influence temperature changes, but sea currents, prevailing wind direction, continentality (how large a landmass is) and altitude also shape temperate climates. The Köppen climate classification defines a climate as "temperate" C, when the mean temperature is above but below in the coldest month to account for the persistency of frost. However, other climate classifications set the minimum at . Zones and climates The north temperate zone extends from the Tropic of Cancer (approximately 23.5° north latitude) to the A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustose Lichen
Crustose lichens are lichens that form a crust which strongly adheres to the substrate (soil, rock, tree bark, etc.), making separation from the substrate impossible without destruction. The basic structure of crustose lichens consists of a cortex layer, an algal layer, and a medulla. The upper cortex layer is differentiated and is usually pigmented. The algal layer lies beneath the cortex. The medulla fastens the lichen to the substrate and is made up of fungal hyphae. The surface of crustose lichens is characterized by branching cracks that periodically close in response to climatic variations such as alternate wetting and drying regimes. Subtypes * Powdery – considered as the simplest subtype due to the absence of an organized thallus. :The thallus appears powdery. :E.g. Genera '' Lepraria'', ''Vezdaea'' * Endolithic – grows inside the rock, usually in interstitial spaces between mineral grains. The :upper cortex is usually developed. :E.g. Genus '' Lecidea'' * Epi ... [...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 ... 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] |
Gustav Wilhelm Körber
Gustav Wilhelm Körber (10 January 1817, Hirschberg – 27 January 1885, Breslau) was a German lichenologist. He studied natural sciences in Breslau and Berlin, obtaining his PhD in 1839 with the thesis ''De gonidiis lichenum''. After graduation, he served as an instructor at the "Elisabethanum" in Breslau, and from 1862, worked as a private teacher. In 1873 he became an associate professor at the University of Breslau.JSTOR Global Plants (biography) Best known for his investigations of lichen species native to Silesia, he also examined specimens found in central and southeastern Europe as well as lichen collected from |
Tremolecia Atrata
''Tremolecia'' is a genus of lichen-forming fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from .... Members of the ''Tremolecia'' are commonly called disc lichens, which may also refer to members of the genus '' Buellia''. References Lecanoromycetes Lecanoromycetes genera Lichen genera Taxa described in 1953 Taxa named by Maurice Choisy {{Lecanoromycetes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. '' Panthera leo'' (lion) and '' Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
