Primulaceae. 



175 



elements of the uppermost layer above the veins, are more 

 elongated and cylindrical ; the lower layers consist of slightly 

 ramified cells. The whole of the mesophyll is rich in chloro- 

 phyll granules, which are also found in the epidermis of 

 the lower surface. 



Hydathodes are present on the leaf-margin, opposite 

 the stronger veins. Small glandular hairs, with a one-celled 



Fig. 5. Primula egaliksensis. 

 a, Transverse section of the calyx near its base, b, The epidermis from the inner surface 

 of the calyx, c, The epidermis from the outer surface of the calyx (the apex of the lobes), 

 (a, b and c, Obj. 4, Oc. 4). d and e. Forms of hairs from the margin of the calyx-lobes; 

 (Obj. 4, Oc. 6). /, The epidermis from the upper surface of the corolla-limb, q. The epid- 

 ermis from the lower surface of the corolla-limb ; (Obj. :!. Oc. 12). (Igaliko.) 



head on a one-celled stalk are found on both surfaces of 

 the leaf, but only in small numbers. (Fig. 4, c.) 



The Flower. The epidermis on the inner surface of 

 the calyx, near its base, shows strongly thickened and arched 

 cupola-like outer walls, the lateral walls being undulating 

 and with irregular pores (fig. 5, a and b). Towards the apex 

 the epidermal cells have more resemblance to those of the 

 outer surface (fig. 5, c). Stomates appear fairly frequently on 

 the outer surface of the calyx, being most numerous in the 



