Fig. 13. Castilleia pallida. 

 A and В, Transverse section of leaves (Vi)- A, var. septentrionale 

 (Churchill); В, the principal form (Kola). C, Transverse section of the 

 midrib of the leaf (Kola). D and E, The uppermost and lowermost 

 layers of the mesophyll, seen in surface view. F, Transverse section 

 of leaf. G, A glandular hair, more highly magnified. Я and /, Epi- 

 dermis from the upper and lower surface of the leaf respectively. 

 {D, E, F, H and I King Point; G Kola.) {€, D, E, F, H and / about 

 90/^; G about 220/^.) 



