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 {Sfnilax 

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

 tercellular air spaces; 3, Pentagular intercellular air spaces. 



