Compare

Achnanthes subhudsonis var. krauselii is very small, and might be confused with Microcostatus krasskei. The frustules of A. subhudsonis var. krauselii, however, are distinctive because of the widely spaced, radiate striae on the raphe valve.

LM scalebar = 10 µm
Achnanthes subhudsonis var kraeuselii LM5 Achnanthes subhudsonis var kraeuselii LM2 Achnanthes subhudsonis var kraeuselii LM1 Achnanthes subhudsonis var kraeuselii LM3 Achnanthes subhudsonis var kraeuselii LM6 Achnanthes subhudsonis var kraeuselii LM4
Length Range
9-14 µm
Width Range
2.9-4.0 µm
Striae in 10 µm
20

Also compare to

Microcostatus krasskei

(Hust.) J.R.Johans. and Sray 1998

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