Microspora (genus of algae)
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Microspora floccosa (right, Fig. 4–7) |
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Microspora is a species from the green algae group of Chlorophyceae that occurs in freshwater. It includes around 20 species.
features
The representatives form unbranched threads from a row of cells. The cells are cylindrical, have a nucleus and a wall-mounted chloroplast . This is reticulated or irregularly band-shaped and has no pyrenoid . The cell wall consists of two H-shaped halves that interlock like a box. The growth occurs through cell division within the thread. A new, H-shaped piece of cell wall is formed in the middle of the mother cell. The formation of the H-shaped components is a parallel development to the Xanthophyceae Tribonema .
The asexual reproduction is effected by the formation of a large zoospore two or four equally long flagella contributes. The zoospores enter the open air when the two cell halves move apart. Some species form thick-walled immobile cells (akinetes). The sexual reproduction of the genus is not entirely clear, there are small, two-flagellated swarmers known that resemble gametes .
Occurrence
The representatives of the genus live mostly fixed in standing or flowing, mostly nutrient-poor waters. They are less likely to be free-floating. They occur mainly in spring.
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. 258.
