152 
culae and connections between thinner-walled cells, just as in 
certain Hricacew, 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; C. H. 
O.) still showed in- 
dications of oil, 
especially in the 
tissue bordering 
on the pith. In a 
specimen of July 6 
(Loc. ign.) oil had 
sæ 
ET 
quite disappeared, 
while starch was 
= 
wast 
found. 
The root. (Figs. 
8and9). Old roots, 
as was also the case 
with the stem, are 
not characterized 
by any especial de- 
2 
velopment of cork- 
tissue. The sieve- 
tissue is collen- 
chymatously thick- 
ened as in the 
stem. A folding of 
the cells (not ves- 
Fig. 8. Diapensia lapponica. sels) similar to that 
Transverse section of root; slightly mag. in the stem, Was 
(Kangersuak.) 
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. 
