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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). Pinnularia nodosa is distinguished from other Pinnularia species with triundulate margins by the mottled pattern in the axial and central areas.

LM scalebar = 10 µm
Pinnularia nodosa LM7 Pinnularia nodosa LM6 Pinnularia nodosa LM2 Pinnularia nodosa LM5 Pinnularia nodosa LM4 Pinnularia nodosa LM1 Pinnularia nodosa LM3
Length Range
40.9-65.2 µm
Width Range
7.6-9.3 µm
Striae in 10 µm
9-11

Pinnularia nodosa var. percapitata

Krammer 2000

Pinnularia nodosa var percapitata LM5 Pinnularia nodosa var percapitata LM4 Pinnularia nodosa var percapitata LM3 Pinnularia nodosa var percapitata LM2 Pinnularia nodosa var percapitata LM1
Length Range
42.5-69.7 µm
Width Range
7.7-10.6 µm
Striae in 10 µm
10