See text Radaisia is a genus of coccoid cyanobacterium comprising about 10 identified species.

[1] It is a colonial cyanobacterium, the bacteria initially forming a round to irregularly shaped flat group of gelatinous or crustose cells attached to the substrate from which arise rows of pseudofilamentous cells in mucilaginous sheaths perpendicular to the initial colony.

[1][2] Apical cells of the pseodofilamentous sheaths are elongate compared to proximal cells in the sheath.

[1] Cell division in the genus is notably irregular, although usually perpendicular to the axis in the pseudofilament.

[1] The cells are light blue-green to reddish purple in color.