Compare Pinnularia parvulissima
Pinnularia subgibba var. undulata is more narrow, with a less developed fascia.
Pinnularia gibba is larger and has more capitate ends.
Pinnularia subgibba is larger and has a greater length to width ratio and more narrow fascia.
LM scalebar = 10 µm
Length Range
40-88 µm
40-88 µm
Width Range
9-12 µm
9-12 µm
Striae in 10 µm
9-10
9-10
Length Range
67-83 µm
67-83 µm
Width Range
8.30-9.30 µm
8.30-9.30 µm
Striae in 10 µm
9-10
9-10
