^3 



Fig. 55. Synedra nana , ( 5 ), cells 50-90u long, l-2u wide; striae 

 very light, 25-30 in lOu. X 1000. Widely distributed. 



valve view 

 Notes : 



Fig. 56. Synedra parasitica , ( 5 ), cells 10-25u long, 3-5u wide; 

 striae delicate, somewhat radial, 16-19 in lOu. X 1000. 

 Sometimes parasitic on Nitzschia sigmoides. 



valve 

 Notes : views 



S. parasitica var. 



subconstricta 



Fig. 57- Synedra pulchella , (5 ), cells 33-150u long, 5-8u wide; about 

 12-15 striae in lOu (sometimes as many as 20); large clear 

 refractive central area. X 1000. 



valve views 



C' - ■ ■ ■■ !■ ■ — - '■'!■'■■ 1 11 , 

 ■; :■■■ ■ ,, ..... , -:■■•■' - :. , : - "■ l! ' ■'■ I"-. \ 



S. putchella 



«» ARM mmm% 



var. lanceolata var. var. naviculacea 



form constricts minuta 



Notes : 



