What we have observed, that there is some sort of granular consistency on mucilaginous surface and cell division occurs in 3 planes. It seems to look like Astrocapsa. Before confirming, collect this specimens at different gradients of precipitation. May be at Humid conditions, it may represent Gleocapsa sp.

In genera like Astrocapsa, Gleocapsa and Gleocapsopsis, morphological diversity pose problems in Identification. hence its better to observe their morphological convergence events. I feel it is a Gleocapsa sp

For more details, refer the literature " Validation of the Genera Gloeocapsopsis and Asterocapsa (Cyanoprokaryota) with Regard to Species from

Japan, Mexico and Himalayas" by Komarek (1993)

This could be Gloeocapsa. Often found on walls. Check this paper out ...

Archives of Microbiology

October 1981, Volume 130, Issue 2, pp 165-174

Ultrastructure of a cave-wall cyanophyte-Gloeocapsa NS4

Guy Cox, Diana Benson, D. M. Dwarte

Also, if you can get hold of the book "Cyanophyta" by T.V. Desikachary, you might be able to identify from the figures and descriptions given there.

Its a good single cell organism to work many aspects of cyanobacteria.

Same as above, I already observed Gloeocapsa colonies on humid concrete or plaster walls.

I agree -it's commonly found subaerial on damp rocks, soil, stone walls, monuments, etc.  A good reference to possess for Gloeocapsa and the other coccoid cyanobacteria:   

Komárek, J. (2003). Coccoid and colonial cyanobacteria. In: Freshwater Algae of North America. Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 59-116. Amsterdam Boston London New York Oxford Paris San Diego San Fransisco Singapore Sydney Tokyo: Academic Press.

http://www.elsevier.com/books/freshwater-algae-of-north-america/wehr/978-0-12-385876-4

Thanks for the great help😀

Dear Nur,

I doubt the first picture as that of Chroococcus limneticus  and the second one as Gloeocapsa violacea Kützing

Reference: Cyanoprokaryota ,Teil 1.Chroococcales,Komárek, J and Anagnostidis .K(1998)

Good luck!

Hello Nur,

Agree with Chroococcus limneticus and Gleocapsa sp (?)

Best Wishes 

Anila Ajayan