Compare

The valve margin of P. viridis is more expanded and the stria density is greater.

LM scalebar = 10 µm
Pinnularia streptoraphe LM9 Pinnularia streptoraphe LM8 Pinnularia streptoraphe LM7 Pinnularia streptoraphe LM6 Pinnularia streptoraphe LM5 Pinnularia streptoraphe LM3 Pinnularia streptoraphe LM1
Length Range
134-174 µm
Width Range
24-27 µm
Striae in 10 µm
5

Also compare to

Pinnularia viridis

BioData Reference
Krammer 2000 Pl 185 Fig 1-4 Pl 186 Fig 1-4 Pl 187 Fig