144 KAARE MÜNSTER STRØM. 



being about 10 miles from my base. The algæ were collected 

 from as varied localities as possible, but I regret very much 

 that I did not make my investigations more extensive, and thai 

 I did not note the macrophytes on or amongst which the algae 

 occurred. Special attention was paid to the plankton, which, 

 however, proved to be of very little interest. 



The material was too incomplete for a real ecological and 

 biological study. I have, however, noticed the associations in 

 which the algæ occurred, and have also tried to give an account 

 of the geographic affinities of the alga-flora in the district 

 surveyed. 



Finally I wish to express my thanks to professor Wille, 

 under the charge of whom this paper was prepared. He has 

 also revised the more critical determinations in the following 

 account. 



I. The Topography, Geology &c. of the District 

 investigated. 



Tuddal hôtel is situated about 3100 feet over the level of 

 the sea, the surroundings are culminating at the Gausta- 

 mountain, about 6000 feet. The most of the area surveyed has 

 a southern exposition, and nearly all the country investigated is 

 situated near or over the wood-limit. — It contains an abundance 

 of bogs, both Sphagnum-bogs and others, as well as many greater 

 and smaller pools and tarns. Three small lakes are situated at 

 an elevation of about 3000 feet. 



There are also many brooks and smaller water-falls, as well 

 as boggy springs and irrorated rocks. The phanérogame vegeta- 

 tion was of little interest, but proved clearly that the climate 

 is comparatively mild, the wood-limit of Picea excelsa was 

 about 3100 feet and scattered specimens could be observed at 

 3800 feet. The dwarfbirch (Betula nana) and Salices were 



