Some chroococcalean and oscillatorialean Cyanoprokaryotes from southern African lakes, ponds and pools

This article is the first part (Chroococcales and Oscillatoriales) of a stu dy of little known planktic and metaphytic cyanoprokaryotes (cyanophytes, c yanobacteria) from ponds, lakes and water reservoirs in southern Africa. Th irty-three species were observed, of which 24 are presented with comments. Ten new species are defined, and one species, originally described as a tax onomic form, is recombined to the specific level. Our results demonstrate t he specificity of southern African cyanobacterial microflora.