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Schaereria
''Schaereria'' is a genus of lichen-forming fungi. It is the sole genus in the family Schaereriaceae, which itself is the only family in the Schaereriales, an order in the subclass Ostropomycetidae of the class Lecanoromycetes. Taxonomy The genus name of ''Schaereria'' is in honour of Ludwig Emanuel Schaerer (1785–1853), who was a Swiss pastor and lichenologist. Genus ''Schaereria'' was circumscribed by German lichenologist Gustav Wilhelm Körber in 1855, with ''Schaereria lugubris'' assigned as the type species. The genus was accepted a few years later by Theodor Magnus Fries. It subsequently fell into disuse as William Nylander placed it in synonymy with ''Lecidea''. Josef Poelt and Antonín Vězda resurrected the genus in 1977, and included '' S. cinereorufa''. ''Schaereria'' is one of several dozen genera whose species were previously included in the large genus ''Lecidea''. However, ''Lecidea'' has a different ascus structure than ''Schaereria''. The family Sc ...
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Ostropomycetidae
The Ostropomycetidae are a subclass of mostly lichen-forming fungi in the class Lecanoromycetes. The subclass was circumscribed in 2004 by Catherine Reeb, François M. Lutzoni, and Claude Roux. It contains ten orders and 36 families. Arctomiaceae is the only family in the Ostropomycetidae that associates with cyanobacteria of the order Nostocales as its main photobiont partner. Taxa of uncertain classification The following taxa are of uncertain classification (incertae sedis) in the Ostropomycetidae: Family incertae sedis: *Epigloeaceae Genera incertae sedis: *''Amphorothecium'' – 1 sp. *''Anzina'' – 1 sp. *'' Aspilidea'' – 1 sp. *''Bachmanniomyces'' – 8 spp. *'' Dictyocatenulata'' – 1 sp. *'' Malvinia'' – 1 sp. *''Pleiopatella ''Pleiopatella'' is a genus of fungi in the Helotiales order. The relationship of this taxon to other taxa within the order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects a ...
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Ludwig Schaerer
Ludwig Emanuel Schaerer (11 June 1785 – 3 February 1853) was a Swiss pastor and lichenologist. Interested in natural history from a young age, Schaerer trained as a teacher and studied theology in Bern. During his career as a teacher, orphanage director, and pastor, he researched extensively and maintained correspondence with foreign botanists interested in cryptogams. Schaerer was best known for his multi-volume work ''Lichenum Helveticorum Spicilegium'' ("Anthology of Swiss Lichens"), published in 12 parts from 1823 to 1842. This series catalogued and described the lichens of Switzerland, particularly those in the Alps, where he often went on collecting excursions. In another series, he compiled and distributed dried herbarium specimens acquired from his collections. Several lichen taxa have been named in honour of Schaerer. Early life and education Ludwig Schaerer was born on June 11, 1785, in Bern. His father, Johann Rudolf, was a professor of biblical studies and ...
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Lecidea
''Lecidea'' is a genus of crustose lichens with a carbon black ring or outer margin (exciple) around the fruiting body disc (apothecium), usually (or always) found growing on (saxicolous) or in ( endolithic) rock.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, Lichens that have such a black exciple are called lecideine A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. Members of the genus are commonly called disk lichens or tile lichens.


Selected species

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Josef Poelt
Josef Poelt was a botanist, bryologist and lichenologist. He held the chair in Systematic Botany and Plant Geography at the Free University of Berlin (1965 - 1972) and then was head of the Botanical Institute and Botanical Garden of Graz University, Austria (1972 - 1990). Early life and education Josef Poelt was born in 1925 in the village of Pöcking in Bavaria, Germany, where his parents ran a guest house. He began to study botany at the Ludwig Maximilian University of Munich but due to the start of the Second World War he joined the German army and was assigned to an intelligence unit in Russia. After illness and time as a prisoner of war of the British, he returned to university study in 1946 and graduated with a bachelor's degree in natural sciences in 1950. Poelt was influenced by a botanist, H. Paul, to study non-flowering plants. He made use of the lichen herbarium at the university's botanic garden which contained nineteenth century specimens collected by Ferdinand Arnol ...
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Antonín Vězda
Antonín (Toni) Vězda (25 November 1920 – 10 November 2008) was a Czech lichenologist. After completing a university education that was postponed by World War II, Vězda taught botany at the Czech University of Life Sciences. In 1958, he was dismissed from his university position as a result of the restrictions placed on academic freedoms by the communist regime in power. He eventually was hired as a lichen researcher by the Czechoslovak Academy of Sciences, who allowed him to work from his apartment, which served also as an office and herbarium. Vězda was a productive worker, publishing nearly 400 scientific papers between 1948 and 2008, most solitarily, describing hundreds of new taxa, and building up a herbarium collection of more than 300,000 specimens. He was praised for his series of exsiccates – sets of dried herbarium specimens – assembled with both local species as well as samples sent to him from colleagues throughout the world. Known as an outstanding lic ...
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Ascus
An ascus (; ) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. '' Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. '' Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some '' Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the "bou ...
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Maurice Choisy
Maurice Gustave Benoît Choisy (29 June 1897 – 19 June 1966) was a French mycologist Mycology is the branch of biology concerned with the study of fungus, fungi, including their genetics, genetic and biochemistry, biochemical properties, their Taxonomy (biology), taxonomy and ethnomycology, their use to humans, including as a so ... and lichenologist. He was a member of the Botanical Society of France, the Mycological Society of France, and the . He was president of the botanical section of the latter society from 1949 to 1950. Species named after Choisy include '' Dermatocarpon choisyi'' ; '' Haematomma choisyi'' ; and '' Lecidea choisyi'' . Selected publications * * * * See also * :Taxa named by Maurice Choisy References 1897 births 1966 deaths French mycologists French lichenologists 20th-century French scientists {{Mycologist-stub ...
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William Nylander (botanist)
William (Wilhem) Nylander (3 January 1822 – 29 March 1899) was a Finnish botanist and entomologist. Nylander was born in Oulu, and taught at the University of Helsinki before moving to Paris, where he lived until his death in 1899. Nylander studied medicine, receiving a degree in 1847. Nylander pioneered the technique of determining the taxonomy of lichens by the use of chemical reagents, such as potassium hydroxide, tinctures of iodine and calcium hypochlorite, still used by lichenologists as the K and C tests. Nylander was the first to realise the effect of atmospheric pollution on the growth of lichens, an important discovery that paved the way for the use of lichens to detect pollution and determine the cleanness of air. His brother Fredrik Nylander Fredrik Nylander (9 September 1820 – 29 September 1880) was a Finnish physician and botanist who was among the first to study the plants of Finland, describing about eleven new species. Nylander was born in O ...
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Validly Published Name
In botanical nomenclature, a validly published name is a name that meets the requirements in the ''International Code of Nomenclature for algae, fungi, and plants'' for valid publication. Valid publication of a name represents the minimum requirements for a botanical name to exist: terms that appear to be names but have not been validly published are referred to in the ''ICN'' as "designations". A validly published name may not satisfy all the requirements to be '' legitimate''. It is also not necessarily the correct name for a particular taxon and rank. Nevertheless, invalid names (''nomen invalidum'', ''nom. inval.'') are sometimes in use. This may occur when a taxonomist finds and recognises a taxon and thinks of a name, but delays publishing it in an adequate manner. A common reason for this is that a taxonomist intends to write a ''magnum opus'' that provides an overview of the group, rather than a series of small papers. Another reason is that the code of nomenclature chan ...
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