Chaetophora
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_(14778161415).jpg) Chaetophora elegans | ||||||||||||
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| Schrank |
Chaetophora ist eine Algen-Gattung aus der Klasse der Chlorophyceae. Sie wurde 1783 von Franz von Paula Schrank beschrieben.
Beschreibung
Chaetophora bildet makroskopische, halbkugelige bis kugelige, hellgrüne, auf Substraten festsitzende Polster aus stark verzweigten Fäden mit zylindrischen Zellen. Die Zellen besitzen einen wandständigen ring- oder halbringförmigen Chloroplasten mit Pyrenoiden. Von einem kleinen, das Substrat überkriechendem Fadengeflecht gehen aufrechte, in eine in eine feste Gallerte eingebettete Fäden aus. Ihre Enden laufen in glasklare, mehrzellige, feine Haare aus. Das Wachstum erfolgt durch Zellteilung in einer Zone an der Basis des Fadens.
Fortpflanzung
Die ungeschlechtliche Vermehrung erfolgt durch große, viergeißelige Zoosporen, die durch eine Pore ins Freie gelangen und neue Fäden bilden.
Die geschlechtliche Fortpflanzung erfolgt durch die Verschmelzung kleiner, zweigeißeliger Geschlechtszellen (Isogamie). Der Ort der Reduktionsteilung ist unklar.
Verbreitung
Chaetophora lebt festsitzend auf Pflanzenstängeln und Steinen in fließenden, sowohl nährstoffarmen als auch mittelmäßig belasteten, oft kalkhaltigen Gewässern. Stark saure Gewässer werden gemieden.
Arten (Auswahl)
- Chaetophora elegans
- Chaetophora incrassata
- Chaetophora lobata
- Chaetophora pisiformis
- Chaetophora tuberculosa
Quellen
- Karl-Heinz Linne von Berg, Michael Melkonian u. a.: Der Kosmos-Algenführer. Die wichtigsten Süßwasseralgen im Mikroskop. Kosmos, Stuttgart 2004, ISBN 3-440-09719-6.
Weblinks
- Chaetophora bei algaebase.org
- Bilder von Chaetophora
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Identifier: microscopeitsrev1856carp (find matches)
Title: The microscope and its revelations
Year: 1856 (1850s)
Authors: Carpenter, William Benjamin, 1813-1885
Subjects: Microscopy Microscopes Microscopy
Publisher: London : John Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School
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Text Appearing Before Image:
ving an active spontaneous motion, and KEPKODUCTION OF CH-5:T0PH0EACE^. 357 therefore corresponding precisely to the antherozoids of thetriiLY sexual Protophytes.* 200. The ClKEtophoyaceo! constitute another beautiful andinteresting little group of Confervoid plants, of ^hich somespecies inhabit the sea, whilst others are found in fresh andpuie water, rather in that of gently-moving streams, however,than in strongly-flowing cuiTcnts. Generally speaking, theii-filaments put-forth lateral branches, ^i^- 109- and extend them-selves into arbo-rescent fronds;and one of the dis-tinctive charactersof the group isafforded by thefact, that the ex-tremities of thesebranches are usu- \>ally prolonged intobristle-shaped pro-cesses (Pig. 109).As in many pre-ceding cases, theseplants multiplythemselves by theconversion of theendochromeof cer-tain of their cellsinto zoospores;and these, whenset-free, are seen tobe fuimished withfour large cilia. Resting - sporeshave also been seenin many species;
Text Appearing After Image:
Branches of CJKBtophora elegans, in the act ofdischargmg ciliated zoospores, which are seen, as inmotion, on the right. * This group of plants seems to serve as the connecting Link between thosesimple Protophytes in which the sexes are not jet differentiated, and thosehigher forms in which the distinction between the sperm-cells and germ-cells is very apparent. For let it be supposed that in Sphceroplea (§ 198) a con-jugation of two adjacent cells were to take place, at that stage in their develop-ment in which the endochi-ome is uniformly arranged in rings, no differentiationof sexes yet showmg itself,—the process would in all respects correspondwith that of the ordinary Conjugatese. Agaui, whilst in Mesocarpus, the 358 ^MiCEOscopic POEMS OF at;getable life. and it is probable that these, as in Confervacese, are truegenerative products of the fertilization of the contents of germ-cells by antherozoids developed within sperm-cells(§ 198).—Nearly allied to the preceding are the B
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