128 PHARMACEUTICAL BOTANY 
but the radial and end walls are usually thickened with deposits 
of a waxy, waterproof material representing cutin or suberin. 
The thin-walled endodermal cells possess strips or bands of 
cutin which extend around the cells on the inner surface of the 
radial and end walls. These strips or bands are called Casparian 
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Fic. 69.—Cross section of the stele and a portion of the epidermis and cortex of 
the monocotyledonous root of the corn. The outgrowths of the epidermis are root 
hairs. (From “A Textbook of General Botany” by Smith, Overton et al., Macmillan Co., 
publishers.) 
strips. In cross sections the Casparian strips often appear like 
dots or lenticular shaped areas in the radial walls and are 
frequently termed ‘‘Casparian dots or spots.’ In the roots of 
Mexican Sarsaparilla the inner as well as the radial walls are 
suberized; in those of the Honduras variety, inner, radial and 
outer walls all show suberization. Endodermal tissue is devoid 
of intercellular-air-spaces. Its cells contain protoplasm and 
