FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 



191 



increase to about 400 — 450. — There are districts which are very 

 much richer, especially in the western parts of the country, but 

 I think that Tuddal must be regarded as a „rich" alga-field, 

 considering the great elevation, the northern latitude, and the 

 very limited area investigated. 



I have tabulated the genera and species occuning in each 

 order of algae. 





Genera 



Species 



Genera 



Species 



Myxophyceœ 







12 



26 



Coccogoneæ ....... 



5 



11 







Honnogoneæ 



7 



15 







Flagellatœ 







3 



4 



Euglenineæ ....... 



1 



1 







Chrysomonadeæ 



2 



3 







Peridineœ 



5 



9 



5 



9 



Chlorophyceœ 







56 



261 



Conjugatæ ...'.... 



23 



214 







Oedogoniales ...... 



2 



3 







Ulothrichales 



6 



12 







Tribonemales 



2 



3 







Protococcales ...... 



23 



29 







Summa 



76 



300 



For working out some of the problems concerned with the distri- 

 bution of the algae in the height, much more extensive investigations 

 from all parts of the country are required, but one conclusion may be 

 put forward, that: At moderate altitudes in Southern Nor- 

 way (not exceed ing 4000 feet), almost as man y algae occur 

 as in thelowlands, the richness orpoverty ofthealga- 

 flora is depending largely upon the geologic forma- 

 tions and the rain and snow-fall. — In the most parts of 



