Compare

Pinnularia brebissonii is smaller and has more broadly rounded ends.

Pinnularia premicrostauron has less strongly radiate central striae.

Pinnularia brebissonii var. bicuneata has smaller cells and more obtuse ends.

LM scalebar = 10 µm
Pinularia wisconsinensis LM3 Pinularia wisconsinensis LM4 Pinularia wisconsinensis LM5 Pinularia wisconsinensis LM2 Pinularia wisconsinensis LM6 Pinularia wisconsinensis LM7 Pinularia wisconsinensis LM1
Length Range
55.4-73.7 µm
Width Range
10.9-12.9 µm
Striae in 10 µm
10-12

Pinnularia brebissonii

(Kütz.) Rabenh. 1864

Pinnularia brebissonii LM7 Pinnularia brebissonii LM6 Pinnularia brebissonii LM5 Pinnularia brebissonii LM4 Pinnularia brebissonii LM3 Pinnularia brebissonii LM2 Pinnularia brebissonii LM1
Length Range
19.7-57.2 µm
Width Range
7.3-10.9 µm
Striae in 10 µm
10-13

Also compare to

Pinnularia brebissonii var. acuta

Grunow in Van Heurck

Pinnularia premicrostauron

Krammer and Metzeltin 2000

Pinnularia brebissonii var. bicuneata

Grunow in Van Heurck