384 



Fr. J, Mathiesen. 



dulating lateral walls; they are thin and without pores (Fig 

 8, D). Stomata occur almost equally on both sides of the 

 leaf, frequently they are slightly in the majority on the 



Fig. 8. Veronica alpina. 

 A, Epidermis of the lower surface of the leaf. B, Epidermis of the 

 upper surface of the leaf. C, A non-glandular hair from the leaf-margin. 

 D, An epidermal cell more highly magnified. E and F, The upper 

 and lower layers respectively of the mesophyll, in surface view. G, 

 Transverse section of the leaf {A and В about ^^/j; C, E, F and G 

 about ^^^/i; D about ^^^/i). (Greenland, Dronning Louises 0, 8. 8. 1885.) 



upper surface; the stomata are on a level with the surface 

 of the leaf. Both leaf-surfaces are furnished with glandular 

 hairs of the usual type — a two-celled head on a one- 



