55 



Fig. 75. Gomphonema acuminatum , (5), cells 20-70u long, 5-llU vide; 

 10-13 striae in 10u; one isolated puncta in the central 

 area. X 1000. 



valve views 



Notes 



Fig. 76. Gomphonema angustatum , (5), cells 10-h5\i long, 5-9u wide; 

 9-14 striae in lOu; one isolated puncta in the central 

 area; easy to confuse with G. parvulum . X 1000. 





var. producta 



valve views 



Notes : 



Fig. 77. Gomphonema constrictum , (5), cells 25-65u long, 8-lUu wide; 

 10-12 striae in 10|i; one isolated puncta in the central 

 area. X 1000. 



valve view 



Notes 



