Finally , the latewood tracheids are formed , with small radial sizes and greater cell wall thickness .
Then , the first tracheids of the transition zone are formed , where the radial size of cells and thickness of their cell walls changes considerably .
The latewood tracheids are formed , with small radial sizes and greater cell wall thickness .
Then , the first tracheids of the transition zone are formed , where the radial size of cells and thickness of their cell walls changes considerably .