376 



Fr. J. Mathiesen. 



both the upper and lower surface have undulating lateral 

 walls, those of the epidermal cells of the lower surface are 

 however more strongly undulating; under a higher magni- 



Fig. 4. Veronica fruticans. 

 A, Epidermis of the upper, and B of the lower surface ofsthe leaf. 

 C and D, The uppermost and lowermost laver of the mesophyll respec- 

 tively, shown in surface view. E, Epidermal cells from the upper sur- 

 face of the leaf, more highly magnified. F, A non-glandular hair from 

 the mid-rib. G, Transverse section of the leaf {A and B about ^°/i; 

 C, D, F and G about ^^^ i; E about ^'Vi)- (Greenland.) 



fication the lateral walls are seen to be as shown in Fig. 

 4, E: pores and nodose thickenings alternate. The outer walls 

 have fine cuticular striations. Stomata are almost equally 



