Species composition of cyanophyceae in keenjhar lake, district thatta, Sindh, Pakistan

56 species belonging to 20 genera of Order Chroococcales, Oscillatoriales and Nostocales as under are being recorded for the first time from Keenjhar Lake, Sindh, Pakistan.Chroococcales: Aphanothece, Chroococcus, Coelosphaerium, Gloeothece, Gloeocapsa, Gomphos-phaeria, Microcystis, Merismopedia. Oscillatoriales: Arthrospira, Lyngbya, Oscillatoria, Phormidium and Spirulina. Nostocales: Anabaena, Anabaenopsis, Calothrix, Nostoc, Rivularia