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Saprolegniaceae
Saprolegniaceae is a family of freshwater mould. James Ellis Humphrey (1861-1897), an American Mycologist did significant work on this family. Taxonomy Saprolegniaceae contains the following genera, species, and subspecies. * ''Achlya'' ** ''Achlya ambisexualis'' ** '' Achlya americana'' ** '' Achlya androgyna'' ** ''Achlya apiculata'' ** '' Achlya aquatica'' ** ''Achlya bisexualis'' ** '' Achlya bonariensis'' ** '' Achlya caroliniana'' ** '' Achlya catenulata'' ** ''Achlya colorata'' ** ''Achlya conspicua'' ** '' Achlya crenulata'' ** '' Achlya debaryana'' ** '' Achlya dubia'' ** '' Achlya flagellata'' ** '' Achlya glomerata'' ** '' Achlya heterosexualis'' ** ''Achlya hypogyna'' ** '' Achlya intricata'' ** ''Achlya klebsiana'' ** ''Achlya oblongata'' ** '' Achlya oligacantha'' ** '' Achlya orion'' ** '' Achlya ornata'' ** '' Achlya oviparvula'' ** '' Achlya papillosa'' ** '' Achlya primoachlya'' ** ''Achlya prolifera'' ** '' Achlya proliferoides'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Mould
Oomycota forms a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms, called oomycetes (). They are filamentous and heterotrophic, and can reproduce both sexually and asexually. Sexual reproduction of an oospore is the result of contact between hyphae of male antheridia and female oogonia; these spores can overwinter and are known as resting spores. Asexual reproduction involves the formation of chlamydospores and sporangia, producing motile zoospores. Oomycetes occupy both saprophytic and pathogenic lifestyles, and include some of the most notorious pathogens of plants, causing devastating diseases such as late blight of potato and sudden oak death. One oomycete, the mycoparasite ''Pythium oligandrum'', is used for biocontrol, attacking plant pathogenic fungi. The oomycetes are also often referred to as water molds (or water moulds), although the water-preferring nature which led to that name is not true of most species, which are terrestrial pathogens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Ellis Humphrey
James Ellis Humphrey (1861-1897) was an American botanist and mycologist.Makers of American Botany, Harry Baker Humphrey, Ronald Press Company, Library of Congress Card Number 61-18435 He made notable contributions on Saprolegniaceae. He graduated from Harvard University Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of high .... References External links * American botanists 1861 births 1897 deaths Harvard University alumni {{US-botanist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Bisexualis
''Achlya bisexualis'' is a species of water mold. It is described as being close to '' Achlya flagellata'', differing by it striking heterothallism Heterothallic species have sexes that reside in different individuals. The term is applied particularly to distinguish heterothallic fungi, which require two compatible partners to produce sexual spores, from homothallic ones, which are capable of ... and less elongated gemmae. In 1936, it was discovered that the species contains a number of hermaphrodite females, which behave as true females in the presence of strong males. Some of the protein of ''Achlya bisexualis'' have been sequenced, such as Actin, Cytochrome c oxidase subunit 1 & 2, Pyruvate kinase etc. Geography distribution ''Achlya bisexualis'' can be found in fresh water of many place, such as Europe, north America, Korea, South Africa, India etc. Reproduction ''Achlya bisexualis'' as other ''Achlya'' has asexual reproduction and sexual reproduction. One kind of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saprolegnia
''Saprolegnia'' is a genus of water moulds often called cotton moulds because of the characteristic white or grey fibrous patches they form. Current taxonomy puts ''Saprolegnia'' as a genus of the heterokonts in the order Saprolegniales. Habits ''Saprolegnia'', like most oomycetes, is both a saprotroph and necrotroph. Typically feeding on waste from fish or other dead cells, they will also take advantage of creatures that have been injured. An infection is known as oomycosis. ''Saprolegnia'' is tolerant to a wide range of temperature, , but is more prevalent in lower temperatures. While it is found most frequently in freshwater, it will also tolerate brackish water and even moist soil. ''Saprolegnia'' filaments (hyphae) are long with rounded ends, containing the zoospores. Saprolegnia generally travels in colonies consisting of one or more species. They first form a mass of individual hyphae. When the mass of hyphae grows large enough in size to be seen without use of a micro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Aquatica
''Achlya'' is a genus of oomycete (water mold). The genus includes several plant pathogens including ''Achlya conspicua'' and ''Achlya klebsiana''. Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. The genome of ''Achlya hypogyna'' has been sequenced and can be accessed on public online databases, for example on the NCBI website (National Center for Biotechnology Information). The genus was first described in 1823 by Christian Gottfried Daniel Nees von Esenbeck. The type species is ''Achlya prolifera''. Several ''Achyla'' spp. are pathogens of rice seedling A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (emb ...s. References * * * Further reading * * Water mould genera Saprolegniales [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Apiculata
''Achlya'' is a genus of oomycete (water mold). The genus includes several plant pathogens including '' Achlya conspicua'' and '' Achlya klebsiana''. Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. The genome of ''Achlya hypogyna'' has been sequenced and can be accessed on public online databases, for example on the NCBI website (National Center for Biotechnology Information). The genus was first described in 1823 by Christian Gottfried Daniel Nees von Esenbeck. The type species is '' Achlya prolifera''. Several ''Achyla'' spp. are pathogens of rice seedling A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (emb ...s. References * * * Further reading * * Water mould genera Saprolegniale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Androgyna
''Achlya'' is a genus of oomycete (water mold). The genus includes several plant pathogens including ''Achlya conspicua'' and ''Achlya klebsiana''. Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. The genome of ''Achlya hypogyna'' has been sequenced and can be accessed on public online databases, for example on the NCBI website (National Center for Biotechnology Information). The genus was first described in 1823 by Christian Gottfried Daniel Nees von Esenbeck. The type species is ''Achlya prolifera''. Several ''Achyla'' spp. are pathogens of rice seedling A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (emb ...s. References * * * Further reading * * Water mould genera Saprolegniales [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Americana
''Achlya'' is a genus of oomycete (water mold). The genus includes several plant pathogens including ''Achlya conspicua'' and ''Achlya klebsiana''. Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. The genome of ''Achlya hypogyna'' has been sequenced and can be accessed on public online databases, for example on the NCBI website (National Center for Biotechnology Information). The genus was first described in 1823 by Christian Gottfried Daniel Nees von Esenbeck. The type species is ''Achlya prolifera''. Several ''Achyla'' spp. are pathogens of rice seedling A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (emb ...s. References * * * Further reading * * Water mould genera Saprolegniales [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achlya Ambisexualis
''Achlya'' is a genus of oomycete (water mold). The genus includes several plant pathogens including '' Achlya conspicua'' and '' Achlya klebsiana''. Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. The genome of ''Achlya hypogyna'' has been sequenced and can be accessed on public online databases, for example on the NCBI website (National Center for Biotechnology Information). The genus was first described in 1823 by Christian Gottfried Daniel Nees von Esenbeck. The type species is '' Achlya prolifera''. Several ''Achyla'' spp. are pathogens of rice seedling A seedling is a young sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (emb ...s. References * * * Further reading * * Water mould genera Saprolegniale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subspecies
In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics ( morphology), but that can successfully interbreed. Not all species have subspecies, but for those that do there must be at least two. Subspecies is abbreviated subsp. or ssp. and the singular and plural forms are the same ("the subspecies is" or "the subspecies are"). In zoology, under the International Code of Zoological Nomenclature, the subspecies is the only taxonomic rank below that of species that can receive a name. In botany and mycology, under the International Code of Nomenclature for algae, fungi, and plants, other infraspecific ranks, such as variety, may be named. In bacteriology and virology, under standard bacterial nomenclature and virus nomenclature, there are recommendations but not strict requirements for recognizing other important infraspecific ranks. A taxonomist decides whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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