Compare Pinnularia clericii
Pinnularia boyeri is larger and has strongly capitate apices.
Pinnularia macilenta has a linear-lanceolate valve outline. The axial area and by the valve apices that are only slightly set-off.
LM scalebar = 10 µm
Length Range
109-158 µm
109-158 µm
Width Range
13.9-18.6 µm
13.9-18.6 µm
Striae in 10 µm
7-9
7-9
Length Range
71-124 µm
71-124 µm
Width Range
14-16.5 µm
14-16.5 µm
Striae in 10 µm
7-9
7-9
Also compare to
Pinnularia boyeri
BioData Reference
Patrick and Reimer 1966 Pl 60 Fig 8