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Atla (lichen)
''Atla'' is a genus of crustose lichens in the family Verrucariaceae. It has nine species that grow on rocks or on soil. Taxonomy The genus was circumscribed in 2008 by Sanja Savić and Leif Tibell, with '' Atla alpina'' assigned as the type species. According to the authors, the generic name ''Atla'' refers to "the name of a Norse water goddess who sometimes accompanied us in the same habitats as the species named after her." Three species were included in the original circumscription of the genus; these species formed a well-defined clade in the family Verrucariaceae, sister to a clade containing several ''Sporodictyon'' species. Several newly described species were later added from Alaska and Finland. Description ''Atla'' lichens have crustose thalli that are blackish in colour with a surface texture ranging from warty (''verrucose'') to diffusely areolate to immersed in the substrate. The perithecia are 0.3–0.9 mm in diameter, and either sessile or immersed. Ascospo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leif Tibell
Leif Tibell (born 16 November 1944) is a Swedish lichenologist and Emeritus Professor at the University of Uppsala. He is known for his expertise on calicioid lichens. He was awarded the Acharius Medal in 2012 for lifetime achievements in lichenology. Biography Tibell was born in Gothenburg, Sweden, in 1944. He developed an interest in lichens at a young age after meeting the prominent lichenologist Gunnar Degelius through the Gothenburg Botanical Garden, where they were both members. Degelius mentored Tibell, and recommended to him that he should study the subject at Uppsala University, which he did after moving there in the mid 1960s. He continued with graduate studies under the supervision of Rolf Santesson after accompanying him on a research excursion to Norway's Varanger Peninsula in 1966. Santesson was Curator of the Herbarium at the Botany Department. He was also the father of Johan Santesson, who knew Tibell through an organic chemistry research group they we ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sessility (botany)
In botany, sessility (meaning "sitting", used in the sense of "resting on the surface") is a characteristic of plant parts (such as flowers and leaves) that have no stalk. Plant parts can also be described as subsessile, that is, not completely sessile. A sessile flower is one that lacks a pedicel (flower stalk). A flower that is not sessile is pedicellate. For example, the genus ''Trillium'' is partitioned into two subgenera, the sessile-flowered trilliums (''Trillium'' subg. ''Sessilium'') and the pedicellate-flowered trilliums. Sessile leaves lack petioles (leaf stalks). A leaf that is not sessile is petiolate. For example, the leaves of most monocotyledons lack petioles. The term sessility is also used in mycology to describe a fungal fruit body that is attached to or seated directly on the surface of the substrate Substrate may refer to: Physical layers *Substrate (biology), the natural environment in which an organism lives, or the surface or medium on whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Vitikainenii
''Atla vitikainenii'' is a species of saxicolous (rock-dwelling) in the family Verrucariaceae. Found in northern Finland, it was formally described as a new species in 2016 by Juha Pykälä and Leena Myllys. The type specimen was collected by the first author from Oulanka National Park ( Salla, Koillismaa), at an altitude of ; there, it was found growing on pebbles in a northeast-facing dolomite Dolomite may refer to: *Dolomite (mineral), a carbonate mineral *Dolomite (rock), also known as dolostone, a sedimentary carbonate rock *Dolomite, Alabama, United States, an unincorporated community *Dolomite, California, United States, an unincor ... rock outcrop. The species epithet honours Finnish lichenologist Orvo Vitikainen, who, according to the authors, "has contributed in many ways to our knowledge of the taxonomy, ecology and biogeography of Finnish lichens". References Verrucariales Lichen species Lichens described in 2016 Lichens of Northern Europe {{Euroti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Tibelliorum
''Atla tibelliorum'' is a rare species of saxicolous (rock-dwelling) in the family Verrucariaceae. Found in Finland and the United States, it was formally described as a new species in 2016 by Juha Pykälä and Leena Myllys. The type specimen was collected by the first author near Toskaljärvi lake (, Enontekiö); there, in a calcareous alpine grassland at an altitude of , the lichen was found growing on dolomite pebbles. It has also been collected from Franklin Bluffs, Alaska, where it was growing on high- pH soil in dwarf shrub tundra. The species epithet ''tibelliorum'' honours "Sanja and Leif Tibell Leif Tibell (born 16 November 1944) is a Swedish lichenologist and Emeritus Professor at the University of Uppsala. He is known for his expertise on calicioid lichens. He was awarded the Acharius Medal in 2012 for lifetime achievements in lich ..., the mother and father of the genus ''Atla''". References Verrucariales Lichen species Lichens described in 2016 Lichen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Recondita
''Atla recondita'' is a rare alpine species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Sweden, it was formally described as new to science in 2015 by Sanja and Leif Tibell. The type specimen was collected from Hamrafjället (Härjedalen Municipality) at an altitude of ; there, it was found growing on calciferous rocks. It is known only from a few locations in this area, collected at an altitude range between . The lichen has a thin olive brown-coloured thallus and ascospores with 9–15 transverse septa and 3–4 longitudinal septa. The authors note that it is not possible to distinguish this species from the similar ''Polyblastia'' by morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines *Morphology (archaeology), study of the shapes or forms of artifacts *Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies, ... alone. References Verrucariales Lic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scandinavia
Scandinavia; Sámi languages: /. ( ) is a subregion in Northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. In English usage, ''Scandinavia'' most commonly refers to Denmark, Norway, and Sweden. It can sometimes also refer more narrowly to the Scandinavian Peninsula (which excludes Denmark but includes part of Finland), or more broadly to include all of Finland, Iceland, and the Faroe Islands. The geography of the region is varied, from the Norwegian fjords in the west and Scandinavian mountains covering parts of Norway and Sweden, to the low and flat areas of Denmark in the south, as well as archipelagos and lakes in the east. Most of the population in the region live in the more temperate southern regions, with the northern parts having long, cold, winters. The region became notable during the Viking Age, when Scandinavian peoples participated in large scale raiding, conquest, colonization and trading mostly throughout Eu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Praetermissa
''Atla praetermissa'' is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Scandinavia, it was formally described as a new species in 2008 by Sanja Savić and Leif Tibell. The type specimen was collected in Andersjöåforsen ( Funäsdalen, Härjedalen Municipality, Sweden). In addition to Sweden, it has also been recorded in Norway; it grows on calcareous rocks near streams, at altitudes ranging from . The lichen has a superficial, thin and sometimes mesh-like, crustose thallus that is grey to dark green, sometimes with a brownish tinge. Its ascospores are narrowly ellipsoidal and measure 44.7–49.2 by 19.0–22.4 μm. ''Atla praetermissa'' has an unidentified green alga as a photobiont A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Palicei
''Atla palicei'' is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Sweden, it was formally described as a new species in 2008 by Sanja Savić and Leif Tibell. The type specimen was collected in the Kärkevagge valley (, Kiruna Municipality), where it was found near a stream growing on a west-facing calcareous boulder. It is only known to occur in the in Sweden at elevations between , but the authors suggest that it is "probably overlooked elsewhere". The lichen has a blackish-brown, scurfy thallus that is diffusely areolate, and ascospores measuring 43–51 by 23–26 μm 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 Unit .... References Verrucariales Lichen species Lichens described in 2008 Lichens of Northern Europe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Oulankaensis
''Atla oulankaensis'' is a rare species of saxicolous (rock-dwelling) lichen in the family Verrucariaceae. It has been recorded in Finland and in the Canadian arctic, growing on calciferous rock and on high- pH soil. Taxonomy The lichen was formally described as a new species in 2016 by Juha Pykälä and Leena Myllys. The type specimen was collected by the first author from the Jäkälävuoma gorge in Oulanka National Park ( Juuma, Koillismaa) at an altitude of ; there it was found growing on a shady dolomitic rock outcrop on a northwest-facing wall. The species epithet ''oulankaensis'' refers to the type locality, which is, according to the authors, "one of the lichenologically most valuable areas in Finland". It has also been collected from Banks Island in the Canadian Arctic Archipelago, where it was growing on high- pH soil. Molecular analysis of the internal transcribed spacer DNA regions suggests that '' Atla alaskana'' is the closest relative of ''A. oulankaensi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atla Alaskana
''Atla alaskana'' is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Alaska, it was formally described as a new species in 2015 by Sanja and Leif Tibell. The type specimen was collected from Sukakpak Mountain (Brooks Range) at an altitude of ; there, it was found growing on calciferous rock ledges in open dwarf shrub. The lichen has a thick, whitish-grey 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 wer ... with a granular to verrucose (warted) texture. References Verrucariales Lichen species Lichens described in 2015 Taxa named by Leif Tibell Lichens of Subarctic America {{Eurotiomycetes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymenium
The hymenium is the tissue layer on the hymenophore of a fungal fruiting body where the cells develop into basidia or asci, which produce spores. In some species all of the cells of the hymenium develop into basidia or asci, while in others some cells develop into sterile cells called cystidia ( basidiomycetes) or paraphyses ( ascomycetes). Cystidia are often important for microscopic identification. The subhymenium consists of the supportive hyphae from which the cells of the hymenium grow, beneath which is the hymenophoral trama, the hyphae that make up the mass of the hymenophore. The position of the hymenium is traditionally the first characteristic used in the classification and identification of mushrooms. Below are some examples of the diverse types which exist among the macroscopic Basidiomycota and Ascomycota. * In agarics, the hymenium is on the vertical faces of the gills. * In boletes and polypores, it is in a spongy mass of downward-pointing tubes. * In puffb ... [...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] |
