Compare Pinnularia polyonca var. stidolphii
Pinnularia polyonca has longer striae and is more expanded at the central valve.Pinnularia formica has a much more exaggerated triundulate outline, with a more prominently expanded central margin.
LM scalebar = 10 µm
Length Range
68-80 µm
68-80 µm
Width Range
8.9-10.3 µm
8.9-10.3 µm
Striae in 10 µm
10-12
10-12
