Nitzschia perminuta is more robust and wider than N. hantzschiana. In addition, N. perminuta lacks a central nodule, a feature that further distinguishes it from N. hantzschiana. Some reports of N. perminuta from Oregon, Idaho and Montana have been misidentifications of N. oregona, which is more slender and linear.

LM scalebar = 10 µm
Nitzschia perminuta LM1 Nitzschia perminuta LM5 Nitzschia perminuta LM4 Nitzschia perminuta LM3 Nitzschia perminuta LM2
Length Range
8-20 µm
Width Range
3-4 µm
Striae in 10 µm

Nitzschia oregona

Sovereign 1958

Nitzschia oregona LM1 Nitzschia oregona LM3 Nitzschia oregona LM2 Nitzschia oregona LM5 Nitzschia oregona LM4
Length Range
15-42 µm
Width Range
3 µm
Striae in 10 µm

Also compare to

Nitzschia hantzschiana