

104 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



[Vol. 2 



as this would have been, and that in a comparatively very 

 recent geological period, is not probable, nor is it necessary 

 to assume it in order to explain the occurrence of these 

 plants in the west of Norway, if only one does not blindly 

 adhere to the dogma that plants can migrate only step by 

 step. 



As instances of plants which I assume have migrated from 

 England direct to the west of Norway, the following may be 

 mentioned : 



Asplenium Adiantum nigrum is rare from Jaederen to 

 Kristianssund. It is found in England, but only in the very 

 east of Denmark and the extreme south of Sweden; immi- 

 gration from the two last-mentioned countries seems, there- 

 fore, to be out of the question. 



Asplenium marinum grows in the west of Norway from 

 Mostero to Stadt. It is found in England, but neither in 

 Sweden nor Denmark. 



Erica cinerea grows on the outermost islands from Farsund 



to Sondmore. It is found in England, but in neither Sweden 

 nor Denmark. 



Hymenophyllum peltatum grows in the outermost coast dis- 

 tricts from Farsund to Nordf jord. It is found in England, 

 but neither in Sweden nor Denmark. 



Scilla verna grows in the extreme coast regions from Sond- 

 f jord to Sondmore. It is found in England, but neither in 

 Sweden nor Denmark. 



Scolopendrium vulgare is found in two or three places 

 between Hardanger and Sondfjord. It is common in England, 

 but it is doubtful whether it has grown in Denmark, and in 

 Sweden it is found only in the extreme east, in Gothland. 



Vicia Orobus grows farthest west, from Lister and Jaederen 

 to Sondmore. It is common in England, but is not found in 

 Sweden, and only here and there in Jutland. It might thus be 

 supposed to have come from Denmark direct to Norway, but 

 in that case it would probably grow a little farther south than 

 it does. I consider it, therefore, most probable that it came 

 over from England to the coast of Norway, and then spread 



