143 
There is a well-marked, sparingly-branching primary root; 
in addition to this there are adventitious roots arising from 
the stem. In some cases (doubtless when growing in a suf- 
ficiently damp soil) these roots are developed abundantly and 
grow in towards the tufted plant, whose old leaves provide a 
certain amount of humus which richly provides the roots with 
nourishment. According to Hessezmax, both ectotrophic and 
endotrophic mycorhiza occur very frequently in the young roots; 
and I am able to confirm his statement. 
Fig. 1. Diapensia lapponica (Skädavara in Finmark). 
Tuft in longitudinal section. 
SERNANDER mentions that the Diapensia-tufts may break up, 
and the small tufts thereby formed, ‘‘may function as a means 
of dispersal, as they are blown about on the stony flats and 
thereby scatter the seeds contained in the capsules.’! Vege- 
* Kunne fungera som marklôpara, idet de bläsa kring på fjallhederna och 
derunder utportionera de i kapslerna inneslutna frôna.” 
