HI There try here http://www.algaebase.org/  to Id it , 

but looks like a cyano Chroococcales: Merismopediaceae, or Synechocystis  or Synechococcus

I think it is a cyanobacteria..it is more of Synochococcus or Synechocyctis.

That large cell doesn't look like a Cyanobacteria. I think this is a green algae Chlorococcales-like. Maybe Planktosphaeria or Chlorella. 

Size?? I don't think they are cyanobacteria, they seem to be too large. Try to find similar in http://planktonnet.awi.de/

Cheers

This cells look like :

Chroococcus limneticus Lemmermann 1898

See:

http://www.algaebase.org/search/species/detail/?species_id=29991

http://www.4shared.com/all-images/OeRsBavg/Tao.html

My dear, this seems to be a fungus.

My greetings.

Dear Sandeep,

This could be a species of Aphanocapsa from the order Synechococcales if the cells are in a mucilage.

Good luck!

Its Chroococus or synechocystis, I have seen also seen these in lakes.

Highly variable size, brownish colony colour and the fine granular/globular contents is reminiscent of  a Thraustochytrid.  See attached image for comparison.

It is Stanieria, a cyanobacteria. It is possible to see baeocytes

It can be a cyanobacteria with pale green coc shape and whitouth organels; and not eucaryotic algae. baeocystis also can seen.  Dimension of cell is required. 

OK, at the moment I think there is no answer. Can you send me your pictures, because the colour can't be the original one. The picture itself is more or less pink. That means that bevore you start guessing you have to correct the color. (white balance) . In my opinion there is more than one taxa. And, you are talking about 40x . Is it the magnification or was it the objective? What was the real magnification? The bigger once with a magnification of 40 are definily not Chroococcus, but with a magnification of 10 times 40 everything is different.

Thank you all for the suggestions. 

I think it is Dictyochloropsis , chlorophyta