190 Fr. J. Mathiesen. 



The Leaf. The epidermis of the upper surface exhibits 

 shghtly undulated to nearly straight lateral walls, but those 

 of the lower surface are strongly undulated. Thickenings 

 of the lateral walls, similar to those in fig. 11 a and b, 

 are also present, though less pronounced. No proper palisade 

 layer is developed, nor in Pr. jarinosa var. groenl. does the 

 corresponding layer consist of the barrel-shaped cells, 

 already described in the previous species. The bottom layer 

 of the mesophyll has slightly branched cells. The mesophyll 

 is liberally provided with chlorophyll granules, and these 

 are also present in the epidermis of the lower surface. The 

 number of stomates is, in this species, much greater on 

 the lower than on the upper surface of the leaf. 



Primula nivalis Pallas, var. pumila Ledeb. 



Lit.: Kjellman 1882, p. 515; 1883, p. 492. Pax and Knuïh, 

 1905, p. 102. 



Herbarium material from arctic Siberia (Pitlekaj and 

 the island of St. Lawrence) collected July 7th and August 

 1st, 1879, during the Vega expedition by Fr. R. Kjellman, 

 and by him determined as being the variety pumila Ledeb. 

 The chief difference from the main type, according to this 

 author, lies in the almost entire leaves (1882, p. 515: "Mest 

 afvika de med hänsyn till bladen, hvilka hos hufvudformen 

 äro tätt och hvasst sågade, hos den arctiska formen åter 

 alideles helbräddade. Emellertid finnas ofvergångsformer"). 

 In size they vary greatly; and Kjellman records finding 

 specimens (St. Lawrence and Konyam bay), which, as 

 regards vigorous development, were quite equal to the main 

 type, wherefore he does not think that the designation 

 pumila is quite appropriate. 



My material consisted of specimens with peduncles 

 measuring in height up to 10 cm, and the leaves attained to 



