182 Fr. J. Mathiesen. 



(fig. 9, d). Both surfaces of the leaf are provided with stom- 

 ates, the lower having by far the greater number ; these are 

 level with, or slightly raised above the surface, and are sur- 

 rounded by 4 — 6, most frequently 5, cells. Glandular hairs 

 of the usual Primula type are distributed fairly regularly, 

 though very scantily, over the whole surface. A palisade 

 layer is hardly distinguishable, though the cells of the 

 corresponding layer are almost barrel-shaped (fig. 9, c). The 

 mesophyll is, on the whole, very loose in structure, its bottom 

 layer consisting slightly branched cells. It is amply pro- 

 vided with chlorophyll granules, and these are also found 

 in the epidermis of both surfaces, although only scantily in 

 that of the upper surface. Hydathodes are present on the 

 leaf-margin opposite the stronger veins. 



As in the case of the vegetative parts, the floral organs 

 of Pr. sibirica differ only slightly from the corresponding 

 parts of Pr. egaliksensis. The difference is limited to the less 

 thickened outer and, especially, lateral walls of the epidermis 

 on the inner side of the calyx (compare Pr. egaliksensis in 

 fig. 5, a, b and c). The hairs, most often present on the margin 

 of the sepals, are those with club-shaped heads. 



Primula stricta Hörnern. 



Lit.: Flora Danica, t. 1385. Warming, 1886 a, p. 21 and the 

 following; 1886 b, p. 7. Lindman, 1887, pp. 28, 77. Widmer, 

 1891, p. 122. Børgesen, 1895, pp. 223, 225, 229, 236, 237. Ek- 

 stam, 1897, pp. 166, 167. Pax and Knuth, 1905, p. 86. Sylvén, 

 1905, p. 125. Blytt, 1906, p. 568. 



Alcohol material from the north of Norway (Bosekop near Alten 

 Fjord, Kåfjord), collected by E. Warming, June 1885. Herbarium 

 material from the same places, and also from Iceland (Restara, 1894, 

 St. Stefansson) and Lapponia Imandrae (A. O. Kihlmann, 1892). 



Accordingto Sylvén, Pr. stricta shows, during its first stage 

 of vegetative development, a great resemblance to the closely 

 allied species Pr. farinosa and Pr. scotica. These latter develop 



