PLATE 58 
INTERCELLULAR AIR SPACES 
A, Cross-section of uva-ursi leaf (Arctostaphylos uva-urst, [L.] Spreng.). 
1. Irregular intercellular air spaces. 
B. Cross-section of the cortical parenchyma of sarsaparilla root (Smilax 
officinalis, Kunth). 1, Triangular intercellular spaces; 2, Quadrangular in- 
tercellular air spaces; 3, Pentagular intercellular air spaces. 
