FRESHWATER ALGÆ FROM TUDDAL IN TELEMARK. 167 



96. Euastrum affine. Ralfs. 

 Not uncommon. 



97. Euastrum ampullaceum. Ralfs. 

 General, but never in great abundance. 



98. Euastrum sinuosum. Lenorm. 



The typical form was exceedingly rare, and I have only 

 observed it in one or two cases. 



98 a. var. redudum. W. & G. S. West. 



Frequent, and often in quantity. E. sinuosum is somewhat 

 rare, and it was therefore very surprising to find this variety 

 in such quantity. In fact, it was one of the commoner desmids. 

 Size: long. 55 f.i, lat. 33 jli, lat. isthm. 9 /n. Long. 64 ^, ,lat. 

 41 fi. (Great form.) PI. V, Fig. 1. 



99. Euastrum inerme. (Ralfs) Lund. 

 Scarce. 



100. Euastrum ansatum. Ralfs. 

 General and abundant. 



lOL Euastrum insigne. Hass. 



Not uncommon, but never in great abundance. 



102. Euastrum intermedium. Gleve. 

 Rare, only in one or two samples. 



103. ? Euastrum rostratum. Ralfs. 



I have only observed one specimen, and do not venture to 

 identify the desmid observed as E. rostratum. 



104. Euastrum bidentatum. Näg. 

 Common, often in abundance. 



105. Euastrum dubium. Näg. 

 General, but somewhat scarce. 



106 Euastrum elegans. (Breb.) Kütz. 

 Common, and often in great abundance. With zygospores 

 in one sample. 



