Planktonic cells of Rhizoid, Rough and Soft morphotypes of F. columnare B067. A typical view of the cells grown in liquid medium visualised under HR-SEM of the three morphotypes. Large vesicles were typical on the surface and surroundings of the A) Rhizoid and B) Rough morphotypes. Panel C: On the surface of the cells of the Soft morphotype, only small blebs were seen. The scale bar was 2 μm.