93 



Fig. 151. Nitzschia holsatica , (5), cells 20-55H long, 1.5-2u 



wide; 1^-17 carinal dots in lOu; striae fine; indistin- 

 guishable from other forms unless in the stellate colony. 

 X 1000. Common in the southwest. 



Colony 



Notes : 



Fig. 152. Nitzschia hungarica , (5), cells 20-110 u long, 6-9u wide; 

 carinal dots distinct, 7-9 in 10u; 16-20 striae in lOu. 

 X 1000. Abundant in the southwest. 



iiuniiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiirr 



valve view 



Notes : 



Fig. 153* Nitzschia lacunarum , (5), cells 65-75u long, 6-8u wide; 

 carinal dots small, 7-8 in lOu; about 30 striae in lOu. 

 X 1000. 



valve view 



Notes 



