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Nitzschia balcanica is frequently misidentified as N. capitellata in samples from the US. Nitzschia balcanica differs by having much finer striae (Hustedt lists ca. 40 in 10 µm for it versus 30-32 in 10 µm for N. capitellata).

LM scalebar = 10 µm
Nitzschia balcanica LM1 Nitzschia balcanica LM2 Nitzschia balcanica LM3 Nitzschia balcanica LM4 Nitzschia balcanica LM5
Length Range
23.0-63.0 µm
Width Range
4.0-5.0 µm
Striae in 10 µm
38-40

Also compare to

Nitzschia capitellata

Hust.