light scattered by the cystoliths is distributed from the photosynthetically inefficient upper tissue to the efficient, but light deprived, lower tissue. The results prove that the presence of light scatterers reduces the steep light gradient, thus enabling the leaf to use the incoming light flux more efficiently.
This lower tissue accomplishes about half of the leaf’s carbon fixation, so the cystoliths are performing a crucial function within the plant. So random mutations just happened to produce the machinery to produce the cystoliths, and then to distribute them in the right way. Evolutionists don’t know how this could have happened, but they are certain it did happen.