458 



lions concerning' tlie places, where future inveslif^'ations on 

 this point may be carried ont with the greatest advantage. I 

 naturally intend to investigate also this point in the future, but 

 I am fully aware that it is impossible for me to do this 

 thoroughly, unless others cooperate with me in the elucidation 

 of the question. 



1 therefore communicate my results as quite premilinary : 



Greenland. 

 In the fairly rich material from different places in West, 

 East and South Greenland all the specimens seem to belong to 

 the arctic type. (Dried and spirit material). (Fig. 2, ^ & Fig. 6.) 



North America. 

 From this country 1 have had but two plants for investi- 

 gation, therefore I cannot draw the line here. (1.) F^abrador. 

 specification wanting, arctic type. (2.) Quebec, Gaspé County, 

 River St. Anne des Monts, August, temperate type. (Dried 

 material.) 



Ice land. 



Eastern Iceland. Vallanes (Fig. 6) arctic type. 



» » Seydisfjordur, July » » 



Northern » Helgavatn. June » » ? 



•) » Husavik. June » » ? 



» i> Øfjord. Akureyri, June ... « »? 



North-western 



Iceland. Dyrefjord, July temperate » 



Western » Reykjavik » » 



Southern » Westmanna-lslands, July. . » » 



» « Hjørleifshøfdi, July » » 



•) I) ülfsvatn, Tvidægra, 500 m. 



above sea-level. July . . arctic » 



This material is collected mainly in June or July, a season 

 of the year, in which it is difficult to decide, whether an 



