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Rhodochorton
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Purpureum
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''Rh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Kurilense
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Lepadicola
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Mesocarpum
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Parkeri
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Subsimplex
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Investiens
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodochorton Entozoicum
''Rhodochorton'' is a genus of filamentous red alga adapted to low light levels. It may form tufts or a thin purple "turf" up to 5 millimetres high. The filaments branch infrequently, usually at the tips. Morphology In most species of ''Rhodochorton'', the spore does not persist in the mature plant; instead, a basal web of filaments acts as a holdfast. Indeed, all ''Rhodochorton'' species have distinct basal threads, usually forming a disc, and upright threads, which are typically thinner. Lateral branches usually occur at or near the top of the patent cell, and branching is concentrated towards the tips of threads. Ecology The organism may encrust bare rock surfaces, or be epiphytic upon frondose algae - particularly ''Laminaria hyperborea''. It typically grows in the shadow of these larger algae, in the intertidal zone, and its adaption to low light levels means it is also common in caves. It reproduces in winter using tetrasporangia and don't bear any monosporangia. ''R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrasporangia
Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. The majority of species (6,793) are found in the Florideophyceae (class), and mostly consist of multicellular, marine algae, including many notable seaweeds. Red algae are abundant in marine habitats but relatively rare in freshwaters. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas. Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which may be due to an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and much of its evolutionary plasticity. The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts that la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Algae
Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. The majority of species (6,793) are found in the Florideophyceae (class), and mostly consist of multicellular, marine algae, including many notable seaweeds. Red algae are abundant in marine habitats but relatively rare in freshwaters. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas. Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which may be due to an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and much of its evolutionary plasticity. The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts that l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermatium
Sperm is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). Animals produce motile sperm with a tail known as a flagellum, which are known as spermatozoa, while some red algae and fungi produce non-motile sperm cells, known as spermatia. Flowering plants contain non-motile sperm inside pollen, while some more basal plants like ferns and some gymnosperms have motile sperm. Sperm cells form during the process known as spermatogenesis, which in amniotes (reptiles and mammals) takes place in the seminiferous tubules of the testes. This process involves the production of several successive sperm cell precursors, starting with spermatogonia, which differentiate into spermatocytes. The spermatocytes then undergo meiosis, reducing their chromosome number by half, which produces spermatids. The spermatids then mature and, in animals, construct a tail, or flagellum, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
