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ROLF NORDHAGEN 



area where the rock substrate fully suited its ecological requirements, i.e. 

 the area of Vaga-Lom-Skjak. 



Precisely in this district the relationship between Rhododendron lapponicum 

 and Pinus silvestris is very instructive. Already in the last century R. lapponi- 



FlG. 



10. Kvandalstind with "Thor's Hammer", Romsdalen, Norway. This 

 formation is considered a nunatak by Norwegian botanists. 



cum was discovered in pine forests, situated at a relatively high altitude in 

 Lom. Recently the above-mentioned young Norwegian botanist Sverre 

 Lokken found a mass-occurrence of this species at 650 m above sea level in 

 an open, mixed Pinus silvestris-BetuJa tortuosa forest at Julian in Lom. On 

 this locality R. lapponicum descends even as far as to 500 m above sea level, 

 but there it is, of course, very sparcely represented. 



At last a few words about Pedicularis Oederi in Scandinavia (Fig. 12). Its 

 present chief area in the Norwegian mountains reaches from Jotunheimen in 

 the south to the southernmost part of the Trondelag in the north with a western 



