Crucigenia
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Crucigenia sp. |
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Crucigenia is a genus of colony-forming green algae fromthe Trebouxiophyceae class .
features
The representatives form flat, square colonies. Four small, uniform cells form a square. The individual cells are 4 to 10 micrometers long and have the shape of a triangle or trapezoid. They have a single, wall-mounted chloroplast that does not completely fill the cell. A pyrenoid may be present or absent. The starch is formed within the plastid. The nucleus is in the middle of the cell. Several colonies can also be connected to one another in a jelly.
Asexual reproduction occurs through the formation of four-cell autocolonies, i. That is, a new colony forms within a mother cell wall. These daughter colonies usually remain connected to one another for a long time. Sexual reproduction is not known in Crucigenia .
Occurrence
Coelastrum occurs in plankton predominantly from nutrient-rich waters, including rivers.
Systematics
The genus Crucigenia includes a few species. Algaebase names 11 recognized species.
supporting documents
- Karl-Heinz Linne von Berg, Michael Melkonian u. a .: The Kosmos algae guide. The most important freshwater algae under the microscope. Kosmos, Stuttgart 2004, ISBN 3-440-09719-6 , p. 192.
Individual evidence
- ↑ Crucigenia on algaebase.org ( Memento of the original from June 6, 2019 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed March 20, 2011.
