Primulaceae. 



181 



The transverse section of a peduncle (fig. 8) shows a 

 structure somewhat less resistant than in the case of Pr. egalik- 

 sensis and Pr. stricta. The assimilation tissue is more lacunar, 

 and the stereome is provided with larger and less thick-walled 

 elements. Chlorophyll granules are present also in the epidermis. 



Fig. !». Primula sibirica. 

 a, the epidermis of the upper surface of the leaf, b, the epidermis of the lower surface of 

 the leaf, e, transverse section of the leaf, d, transverse section of the margin of the leaf. 

 e, glandular hair from the upper surface nf the leaf ; the outer walls of the surrounding epi- 

 dermis cells, with fine cuticular striât ions, (a, b, c, and d, obj. i. oc. 4.) (Alten Fjord, Norway.) 



The Leaf. The lateral walls of the epidermis on the 

 upper surface show faint undulations, those of the lower 

 surface being somewhat more pronounced (fig. 9, a and b). 

 The outer walls are provided with fine cuticular striations 

 (fig. 9, e) which are more strongly marked towards the margin 

 of the leaf where the outer epidermal walls become thicker 



