We added the following sentence to Section 2.4: “Gliding requires contact with some (semi-)solid substrate in order to provide a reaction force to the gliding mechanism. We assume that the trichomes are immersed in highly viscous medium that allows them to glide freely in all directions. This medium could consist of the EPS the trichomes produce copiusly when gliding [Hoiczyk2000].” (8)
Qualitative comparisons are made to the fossil record and modern experiments.