FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 175 



153. Cosmarium ahhreviatuni. Racib. 

 Rather scarce. 



154. Cosmarium impressulum. Elfv. 

 Rare. 



155. Cosmarium, Meneghinii. Breb. 

 General, but scarce. 



156. Cosmarium angulosum. Breb. 



var. concinnum. (Rabh.) W. & G. S. West. 



This species was rare, but occurred in several samples. 



157. Cosmarium, difficile. Liitkem. 

 General, but somewhat scarce. 



157 a. var. sublœve. Liitkem. 

 As general as the type. 



158. Cosmarium, lœve. Rabh. 



Somewhat scarce. Size: long. 21,5 /n, lat. 15 (a, lat. isthm. b/u. 



158 a. var. septentrionale. Wille. 

 Rare. 



159. Cosmarium Cucurbita. Breb. 



General, and often in great abundance. Up to 4100 feet, 

 especially in Sphagnum-bogs. Size: long. 31 fx, lat. 17,5 ^i, 

 lat. isthm. 14,5 /n. 



160. Cosmarium Palangula. Breb. 

 Rare. 



161. Cosmarium quadratulum. (Gay) De Toni. 



Not uncommon, but never in abundance. Size: long. 15 jli, 

 lat. 11,5 jii, lat. isthm. 2,2 jn. 



162. Cosmarium subdanicum. W. West. 

 This rare species occurred in a single sample. 

 168. Cosmarium coelatum. Ralfs. 



Not uncommon, but scarce. I have found this species in 

 boggy springs, just as stated by messrs. West. The water 

 had a temperature of about 6° C. 



