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Exserohilum
''Exserohilum'' is a genus of fungi in the family Pleosporaceae. The ''Exserohilum'' species are known for causing blight and human immune system diseases. The sexual reproductive (or ascigerous) states of Exserohilum species are known as Setosphaeria. The type species is ''Exserohilum turcicum''. This genus is among three dematiaceous that are categorized for containing pathogens leading to diseases like phaeohyphomycosis. Morphology ''Exserohilum'' is an asexual organism that reproduces through spores. These one-celled reproductive units are concave and can be seen in the suspensor. Taxonomy ''Exserohilum'' was circumscribed by K. Leonard and Edna Suggs in 1974 to contain species formerly placed in ''Bipolaris'' with distinctly protruding hila. Exsero which means stretch out and hilum which refers to the part of the organism. The truncate hila or hilum, protrudes from its distinct conidia which are ellipsoidal and distoseptate (forming a layer). Colonies of ''Exseroh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exserohilum Curvatum
''Exserohilum curvatum'' is a species of fungus in the family Pleosporaceae. Found in Venezuela, where it grows on the leaves of ''Sorghum'', it was described as new to science in 1984. It differs from other ''Exserohilum'' species by its distinctly curved conidia A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an asexual, non-motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the .... References External links * Fungi described in 1984 Pleosporaceae Fungi of Venezuela {{Pleosporales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exserohilum Antillanum
''Exserohilum antillanum'' is a species of fungus in the family Pleosporaceae. Found in Cuba growing on plant debris, it was described as new to science in 1995. The specific epithet ''antillanum'' refers to the Antillian sea, an old name for the Caribbean Sea. It is most similar in morphology to '' Exserohilum gedarefense'', from which it differs in the size, pigmentation, and ornamentation of its conidia A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an asexual, non-motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the .... References External links * Fungi described in 1995 Pleosporaceae Fungi of the Caribbean {{Pleosporales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exserohilum Turcicum
''Setosphaeria turcica'' (anamorph ''Exserohilum turcicum''; formerly known as ''Helminthosporium turcicum'') is the causal agent of northern corn leaf blight in maize. It is a serious fungal disease prevalent in cooler climates and tropical highlands wherever corn is grown. It is characterized by large cigar shaped necrotic lesions that develop on the leaves due to the polyketide metabolite monocerin. Races Races of ''S. turcica'' are named for the maize R genes which are not effective against them. For example, the maize gene ''Ht1'' does not confer resistance against a Race 1 isolate, while genes ''Ht2'' and/or ''Ht3'' do. In contrast, genes ''Ht2'' and ''HtN'' do not confer resistance against a Race 2N isolate, while gene ''Ht1'' does. Isolates which do not overcome any known R gene are termed Race 0. Race 1, which overcomes the ''Ht1'' resistance gene, was originally discovered in Hawaii in 1973. By the time it was first noted in the continental United States, in Indian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Setosphaeria
''Setosphaeria'' is a genus of fungi in the family Pleosporaceae Pleosporaceae is a family of sac fungi. The taxonomic relationship of this family to associated genera is still not determined. Genera As accepted by GBIF; * '' Acrothecium'' (13) * ''Alternaria'' Nees ex Wallroth, 1816 (841) * '' Alternariast .... References Dothideomycetes genera Pleosporaceae {{Pleosporales stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleosporaceae
Pleosporaceae is a family of sac fungi. The taxonomic relationship of this family to associated genera is still not determined. Genera As accepted by GBIF; * '' Acrothecium'' (13) * ''Alternaria'' Nees ex Wallroth, 1816 (841) * '' Alternariaster'' (14) * ''Bipolaris'' Shoemaker (179) * '' Briansuttonomyces'' (1) * '' Chalastospora'' (6) * '' Cleistotheca'' (1) * ''Cochliobolus'' (45) * ''Crivellia'' Shoemaker & Inderbitzin * ''Curvularia'' (497) * ''Decorospora'' ( Pat.) Inderbitzin, Kohlm. & Volkm.-Kohlm, 2002 (3) * ''Dichotomophthora'' Mehrl. & Fitzp. ex M.B.Ellis, 1971 (17) * ''Drechslera'' (36) * '' Edenia'' (5) * '' Embellisia'' (3) * ''Exserohilum'' K.J. Leonard & Suggs (113) * ''Extrawettsteinina'' M.E. Barr (2) * '' Gibbago'' (2) * '' Halokirschsteiniothelia'' (3) * '' Johnalcornia'' (4) * ''Kriegeriella'' Höhn (4) * ''Lewia'' M.E. Barr & E.G. Simmons * ''Macrospora'' Fuckel (2) * '' Macrosporium'' (28) * '' Malustela'' (1) * '' Mycoporopsis'' (12) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hilum (biology)
In botany, a hilum (pronounced ) is a scar or mark left on a seed coat by the former attachment to the ovary wall or to the funiculus (which in turn attaches to the ovary wall). On a bean seed, the hilum is called the "eye". For some species of fungus, the hilum is the microscopic indentation left on a spore when it separates from the sterigma of the basidium. A hilum can also be a nucleus of a starch grain; the point around which layers of starch are deposited. The adjectival form ''hilar'' denotes the presence of such a mark, and can be used as a distinguishing characteristic of a seed or spore In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, f .... References {{Reflist Plant anatomy Fungal morphology and anatomy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hilum (biology)
In botany, a hilum (pronounced ) is a scar or mark left on a seed coat by the former attachment to the ovary wall or to the funiculus (which in turn attaches to the ovary wall). On a bean seed, the hilum is called the "eye". For some species of fungus, the hilum is the microscopic indentation left on a spore when it separates from the sterigma of the basidium. A hilum can also be a nucleus of a starch grain; the point around which layers of starch are deposited. The adjectival form ''hilar'' denotes the presence of such a mark, and can be used as a distinguishing characteristic of a seed or spore In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, f .... References {{Reflist Plant anatomy Fungal morphology and anatomy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conidium
A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an asexual, non-motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the way they are generated through the cellular process of mitosis. The two new haploid cells are genetically identical to the haploid parent, and can develop into new organisms if conditions are favorable, and serve in biological dispersal. Asexual reproduction in ascomycetes (the phylum Ascomycota) is by the formation of conidia, which are borne on specialized stalks called conidiophores. The morphology of these specialized conidiophores is often distinctive between species and, before the development of molecular techniques at the end of the 20th century, was widely used for identification of (''e.g.'' ''Metarhizium'') species. The terms microconidia and macroconidia are sometimes used. Conidiogenesis There are two main types of co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ellipsoid
An ellipsoid is a surface that may be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is characterized by either of the two following properties. Every planar cross section is either an ellipse, or is empty, or is reduced to a single point (this explains the name, meaning "ellipse-like"). It is bounded, which means that it may be enclosed in a sufficiently large sphere. An ellipsoid has three pairwise perpendicular axes of symmetry which intersect at a center of symmetry, called the center of the ellipsoid. The line segments that are delimited on the axes of symmetry by the ellipsoid are called the ''principal axes'', or simply axes of the ellipsoid. If the three axes have different lengths, the figure is a triaxial ellipsoid (r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sympodial
Sympodial growth is a bifurcating branching pattern where one branch develops more strongly than the other, resulting in the stronger branches forming the primary shoot and the weaker branches appearing laterally. A sympodium, also referred to as a sympode or pseudaxis, is the primary shoot, comprising the stronger branches, formed during sympodial growth. The pattern is similar to dichotomous branching; it is characterized by branching along stems or hyphae. In botany, sympodial growth occurs when the apical meristem is terminated and growth is continued by one or more lateral meristems, which repeat the process. The apical meristem may be consumed to make an inflorescence or other determinate structure, or it may be aborted. Types If the sympodium is always formed on the same side of the branch bifurcation, e.g. always on the right side, the branching structure is called a helicoid cyme or bostryx. If the sympodium occurs alternately, e.g. on the right and then the left, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmopolitan Distribution
In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The extreme opposite of a cosmopolitan species is an endemic one, being found only in a single geographical location. Qualification The caveat “in appropriate habitat” is used to qualify the term "cosmopolitan distribution", excluding in most instances polar regions, extreme altitudes, oceans, deserts, or small, isolated islands. For example, the housefly is highly cosmopolitan, yet is neither oceanic nor polar in its distribution. Related terms and concepts The term pandemism also is in use, but not all authors are consistent in the sense in which they use the term; some speak of pandemism mainly in referring to diseases and pandemics, and some as a term intermediate between endemism and cosmopolitanism, in effect regarding pandemism as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conidiophore
A conidium ( ; ), sometimes termed an asexual chlamydospore or chlamydoconidium (), is an Asexual reproduction, asexual, non-motility, motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the way they are generated through the cellular process of mitosis. The two new haploid cells are genetically identical to the haploid parent, and can develop into new organisms if conditions are favorable, and serve in biological dispersal. Asexual reproduction in ascomycetes (the phylum Ascomycota) is by the formation of conidia, which are borne on specialized stalks called conidiophores. The Morphology (biology), morphology of these specialized conidiophores is often distinctive between species and, before the development of molecular techniques at the end of the 20th century, was widely used for identification of (''e.g.'' ''Metarhizium#Species, Metarhizium'') species. The terms microconidia and macroconidi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
