PLATE V {continued) 



Fig. 3. Transverse section of tracheids in Pinus radiata between crossed Nicols. 

 Note ( 1) a daric "middle lamella" (2) a narrow, bright, outer lamella in the secon- 

 dary wall (3) a broad, dark, lamella within, and (4) often a very thin, bright, inner- 

 most lamella. 



