152 



culae and connections between thinner -walled cells, just as in 

 certain Eriçaceœ, e. g. Ledum. 



The stem contains, during winter and spring, great quan- 

 tities of oil. A specimen of June I (Greenland: Godthaab) still 

 contained abundance of this substance. A specimen of June 29 



(Godthaab; С H. 

 О.) still showed in- 

 dications of oil, 

 especially in the 

 tissue bordering 

 on the pith. In a 

 specimen of July 6 

 (Loc. ign.) oil had 

 quite disappeared, 

 while starch was 

 found. 



The root. (Figs. 

 8and9). Old roots, 

 as was also the case 

 with the stem, are 

 not characterized 

 by any especial de- 

 velopment of cork- 

 tissue. The sieve- 

 tissue is collen- 

 chymatously thick- 

 ened as in the 

 stem. A folding of 

 the cells (not ves- 

 sels) similar to that 

 in the stem, was 

 also observed. The 

 vessels are more distinctly marked than in the stem. The for- 

 mation of annual rings and medullary rays is as in the stem. 



Fig. 8. Diapensia lapponica. 

 Transverse section of root; slightly mag. 



(Kangersuak.) 



