it has come up in my culture and was initially growing with fragillaria sp....is it a diatom or green algae or desmid
Dear Rahul,
I dont think the photomicrograph is of Cosmarium.
It appears like Granulocystopsis.
You may refer
Diversity of algae in Ukraine. P. M. Tsarenko,G. M. Palamar-Mordvintseva, Solomon P. Wasser, DOI: 10.1615/InterJAlgae.v1.i2.10
pages 1-17
If you found such cells in groups of four in a proper symmetrical arrangement then it could be Crucigeniella .
Any way a better microphotograph with scale will be required for proper identification.
Good luck
I agree, the genus is Oocystis Nägeli ex A.Braun, 1855 (green algae - Class: Trebouxiophyceae) and the species... sp. :D
It seems to be a species of the family Oocystaceae, most probably from the genus Oocystis. However, there are several algae species of similar appearance at this resolution. Moreover, the appearance can change depending on growth conditions, cell densities and other factors. To obtain morphological details you would need a much higher resolution (electron microscopy). Getting physiological or ecological data would be helpful but it is a laborious thing. Nowadays, the best way to unambiguously identify an algae species is DNA barcoding (using for example ITS-2 regions).
The species belongs to Family Oocystaceae. It seems to be a species of Genus – Oocystis.
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