auxospores

auxospores
Spore Spore (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster]

Note: Spores are produced differently in the different classes of cryptogamous plants, and as regards their nature are often so unlike that they have only their minuteness in common. The peculiar spores of diatoms (called {auxospores}) increase in size, and at length acquire a siliceous coating, thus becoming new diatoms of full size. Compare {Macrospore}, {Microspore}, {O["o]spore}, {Resting spore}, {Sph[ae]rospore}, {Swarmspore}, {Tetraspore}, {Zo["o]spore}, and {Zygospore}. [1913 Webster] (b) An embryo sac or embryonal vesicle in the ovules of flowering plants. [1913 Webster]

2. (Biol.) (a) A minute grain or germ; a small, round or ovoid body, formed in certain organisms, and by germination giving rise to a new organism; as, the reproductive spores of bacteria, etc. (b) One of the parts formed by fission in certain Protozoa. See {Spore formation}, belw. [1913 Webster]

{Spore formation}. (a) (Biol) A mode of reproduction resembling multiple fission, common among Protozoa, in which the organism breaks up into a number of pieces, or spores, each of which eventually develops into an organism like the parent form. --Balfour. (b) The formation of reproductive cells or spores, as in the growth of bacilli. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Auxospore — In certain species of diatoms, auxospores are specialised cells that are produced at key stages in their cell cycle or life history. Auxospores typically play a role in growth processes, sexual reproduction or dormancy.Hoek, C. van den, Mann, D.… …   Wikipedia

  • Spore — (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster] Note: Spores are produced differently …   The Collaborative International Dictionary of English

  • Spore formation — Spore Spore (sp[=o]r), n. [Gr. ? a sowing, seed, from ? to sow. Cf. {Sperm}.] 1. (Bot.) (a) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species. [1913 Webster] Note: Spores are produced …   The Collaborative International Dictionary of English

  • Sporogenesis — is the production of spores in biology. The term is also used to refer to the process of reproduction via spores. Reproductive spores are formed in many eukaryotic organisms, such as plants, algae and fungi, during their normal reproductive life… …   Wikipedia

  • Pinnularia — is a fresh water alga and a type of Bacilliophyta (diatoms).HabitatPinnularia is a fresh Water alga, usually found in ponds and moist soil.They can also be found in springs, estuaries, sediments and in the ocean.General StructureCell Wall and… …   Wikipedia

  • Мережковский, Константин Сергеевич — В Википедии есть статьи о других людях с такой фамилией, см. Мережковский. Константин Сергеевич Мережковский К.С. Мережковский …   Википедия

  • DIATOMÉES — Les Diatomées ou Bacillariophycées sont des algues microscopiques unicellulaires caractérisées par une enveloppe siliceuse externe à structure très particulière, le frustule. Le groupe, probablement polyphylétique, se subdivise en deux ordres:… …   Encyclopédie Universelle

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