194 



Fr. J. Mathiesen. 



stomates are on a level with the surface of the leaf. Numerous 

 cells, filled with a yellowish-brown substance, are present in 

 the epidermis of both surfaces. 



In this Primula the upper 1 or 2 layers of the meso- 

 phyll consist of elongated and closely placed cells, so that 



Fig. 14. Primula nivalis var. pumila. 



a, the epidermis of the upper surface, b, the epidermis of the lower surface, c, transverse 



section of the leaf, (a and b. obj. 4, oc. 6; c, obj. 4, oc. 4). (Pitlekaj.) 



they may be described as palisades (fig. 14, c). Towards the 

 lower surface, the mesophyll becomes unusually lacunar, and 

 consists of much branched cells extended in the plane of 

 the leaf surface. 



Androsaces septentrionalis L. 

 Lit.: Flora Danica, t. 7. Müller, 1881, p. 358. Brundin, 

 1898, pp. 24, 25, 27. P. Knuth, 1899, p. 307. Pax and Knuth, 



