PLATE 58 



INTERCELLULAR AIR SPACES 



A. Cross-section of uva-ursi leaf (Arctostaphylos uva-ursi, [L.] Spreng.). 

 i. Irregular intercellular air spaces. 



B. Cross-section of the cortical parenchyma of sarsaparilla root (Smilax 

 officinalis, Kunth). i, Triangular intercellular spaces; 2, Quadrangular in- 

 tercellular air spaces; 3, Pentagular intercellular air spaces- 



