Compare Pinnularia nodosa
Pinnularia nodosa is distinguished from other Pinnularia species with triundulate margins by the mottled pattern in the axial and central areas.
Valves of Pinnularia nodosa var. percapitata are more markedly triundulate, with more distinctly capitate apices. The central undulation of the variety is usually a bit wider than the distal undulations and valves are wider (7.7-10.6 µm).
LM scalebar = 10 µm
Length Range
40.9-65.2 µm
40.9-65.2 µm
Width Range
7.6-9.3 µm
7.6-9.3 µm
Striae in 10 µm
9-11
9-11
Length Range
42.5-69.7 µm
42.5-69.7 µm
Width Range
7.7-10.6 µm
7.7-10.6 µm
Striae in 10 µm
10
10
