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 Hesselman, both ectotrophiç and 

 endotrophic mycorhiza occur very frequently in the young roots; 

 and 1 am able to confirm his statement. 



Fig. 1. Diapensia lapponica (Skådavara in Finmark). 

 Tuft in longitvidinal section. 



Sernander mentions that the Diapensia -iuus, 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 fungeia som maiklöpaia, idet de blasa kling på fjalitiedeina ocli 

 derunder utportionera de i kapslerna inneslutna fröna." 



