Diatoms of North AmericaDiatoms of North America
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Compare Nitzschia oregona

Sovereign 1958

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Nitzschia perminuta valves are wider and possess a central nodule.
Nitzschia fonticola valves are more lanceolate.
Nitzschia romana has a higher stria density. 

LM scalebar = 10 µm
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
23-25

Nitzschia perminuta

(Grunow in Van Heurck) H.Perag. 1903

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
22-27

Nitzschia fonticola

(Grunow) Grunow in Van Heurck 1881

Fonticola 001 Fonticola 004 Fonticola 002 Fonticola 011 Fonticola 005 Fonticola 003 Fonticola 007
Length Range
10-55 µm
Width Range
2.5-4.5 µm
Striae in 10 µm
24-27

Also compare to

Nitzschia romana

Grunow