92 



Warming, 1887, p. 109; idem., 1885, pp. 39— 42. Borgesen, 

 1895, pp.236— 237. Lidforss, 1907, p. 75. Segerstedt, 1894, p. 22. 

 Ambronn, 1890, p. 71. 0. G. Petersen, 1901, p. 78. Abromeit, 

 1899, p. 54. 



I have had specimens for investigation from the following 

 localities: — West Greenland: Sukkertoppen (Aug. 16, 1884, E.W.); 

 Amarortalik (July 30, 1884, E.W.); loc. ign. (July II, 1884 and 

 July 28, 1886, S. Hansen). Finmark: Bosekop (E. W.). 



E.s^ 



"Es. 



, -гЕ.ь 



6. -U_L_i.Jo^ ^ 



Fig. 9. Ledum palustre var. decumbens. 



1, 2, Transverse sections through different parts of the leaf, x, Transparent cells. 3. Stoma. 



4. Spongy parenchyma shewing the transparent cells. 5, 6, Glandular hairs seen laterally 



and from above. fE. Warming.) 



The leaf. The epidermis of the upper surface has much 

 thickened outer walls with cuticle, and beneath that a cuticularized 

 layer ; the lateral walls are polygonal and have pores ; a few glandular 

 hairs occur. The outer walls of the lower epidermis are less 

 thickened on account of the dense hairiness of this surface. 

 According to Lidforss, chlorophyll grains occur in the upper 



