While teaching to students algae I suddenly discovered that Blue green algae has been shifted to bacteria and named as Cyanobacteria. I strongly object to this though with no power but all reasons.Earliest creatures did not have power to evolve oxygen. They had only PS I and not PS II
Prokayotic algae were placed as blue green algae in Cyanophyceae . They had power to evolve oxygen 
and have both the systems PSI and PSII like green algae. Only thing is they are prokaryotic. 
To remove them from algae and place them with bacteria has been justified on some contents on the mebrane system but I am not sure what is the criteria for the same. 
To me most important character is evolution of oxygen and presence of PSI and PSII 
and RuBISCO with 8 large and 8 small subunits . This does not justify making a separate entity with bacteria. Its better to keep them with Algae where they were kept initially and correctly but Fristcsh and others.  I want to convey to great galaxy of scientists that please keep blue green algae where it belongs near algae and not hear bacteria.