Fig 6. Cellular changes taking place during desiccation of a false indusium.

(A-B) LM transverse sections of false indusia in the closed (A) and open (B) state. It is functionally built as a bilayer, with the adaxial layer comprising a single row of large tubular cells and the abaxial functional layer consisting of three rows of tangentially elongated, smaller cells. Especially the adaxial, tubular cells undergo a marked deformation during dehydration. The scale in (A) and (B) is identical. (C-D) The collapse of the adaxial cell walls of the tubular cells (i.e, their curvature inversion towards the cell lumen) is well visible after desiccation (S4 Video). The scale in (C) and (D) is identical.