Green algae - Conjugate algae - Closterium
The species of Closterium have a great variety in form and structure and are difficult to identify. In the images you can observe the big difference in size from other species of green algae.
Closterium cf. strigosum with a lot of pyrenoids. The pyrenoids have a function as storeroom for starch.
The genus Cosmarium is one of the largest genera of desmids. Over 2000 species have been described.
They are most abundant in water that is poor in salts of calcium, usually acid water with pH like 7.0-5,0
The cells are deeply incised with clear distinction into two halves. Under the cell division the two semi-cells separates, and each semi-cell then buds forth a new semicell. The cell wall is ornamented in different patterns, according to the species.
The size is about 60 my.
Closterium is characterised by the very elongated cell. The cell is composed of two halves like the most of the genera in this group. Click on the photo for a larger version.
C. cuetzingii. Click on the photo for a larger version.