174 . KAARE MÜNSTER STRØM. 



however, with high magnification observe that the cell wall was 

 segmented. The form can therefore not be referred to Gyhndro- 

 cystis, but must be placed in the genus Gosmarium. 



Both the names minulissimum and Turneri are occupied, 

 and 1 therefore call it C. pseudarctoides, with regard to the 

 species to which it bears the greatest resemblance. 



This species was not very uncommon, and I have also 

 observed it from the vicinity of Christiania, but it has possibly 

 been overlooked in the past. 



Size: long. 13 /n, lat. 7 a. PI. Ill, Figs. 7 & 8. 



145. Cosmarium Regnesi. Reinsch. 

 General, but somewhat scarce. 



146. Cosmarium arctoum. Nordst. 

 Rare. 



147. Cosmarium decedens. (Reinsch) Racib. 



In great quantity on dripping rocks between the filaments 

 of Scytonema mirabile. 



148. Cosmarium ohliquum. Nordst. 



Somewhat rare, in quantity in two samples. Up to 5000 feet. 

 Size: long. 15 /ii, lat. 12,5 /li. 



149. Cosmarium redangulare. Grun. 

 Very rare, only in a single sample. 



150. Cosmarium quadratum. Ralfs. 

 General, and sometimes in abundance. 



PI. IV, Fig. 12. 



150 a. forma Willei. W. & G. S. West. 

 Somewhat scarce. 



151. Cosmarium pusillum. (Breb.) Arch. 



Very rare, only in a single sample. Size: long. 10 u, 

 lat. 9,5 ^. 



*152. Cosmarium pygmœum. Arch. 

 Rare, but occasionally in quantity in Sphagnum bogs. 



