A model is presented to describe how the rotation of the filament causes left-handed sliding for the portion of the filament not encased in a slime sheath, which leads to formation of counter-clockwise spirals, the predominant macroscopic feature of colonies noted.
Results section headings and figure captions should be phrased as conclusions, supported by the data presented, when appropriate (can be a minor change, for example 3.2 could be titled, “Phormidium colonies form divergent structures,” or larger, for example 3.5 could be titled, “Individual filaments undergo directional reversals, with maximum velocity immediately following a reversal.”