Compare Pinnularia subgibba var. lanceolata
Pinnularia subgibba has protracted, nearly capitate apices.
Pinnularia hudsonii has a broader axial area and larger valves.
Pinnularia egregia has a broader transverse fascia and wider axial area.
Pinnularia certa has smaller valves and a broader transverse fascia.
LM scalebar = 10 µm
Length Range
57-74 µm
57-74 µm
Width Range
8.8-10.2 µm
8.8-10.2 µm
Striae in 10 µm
9-10
9-10
Length Range
63-127 µm
63-127 µm
Width Range
11.7-13.6 µm
11.7-13.6 µm
Striae in 10 µm
8-9
8-9
