PLATE 62 
A. Cross-section of calamus rhizome (Acorus calamus, L.). 1, Intercel- 
lular space; 2, Parenchyma cells; 3, Secretion cavity. B. Cross-section of 
white pine bark (Pinus strobus, L.). 1, Parenchyma; 2, ecretion cavity; 
3, Secretion cell 
