Diatoms of North AmericaDiatoms of North America
Return to overview

Compare Fragilariforma virescens

(Ralfs) D.M.Williams and Round 1988

Compare

Fragilariforma virescens differs from F. nitzschioides in the shape of the apices, stria density and the shape in girdle view. Stauroforma exiguiformis lacks rimoportulae and a distinct central sternum.

LM scalebar = 10 µm
Fragilariforma virescens LM6 Fragilariforma virescens LM3 Fragilariforma virescens LM1 Fragilariforma virescens LM4 Fragilariforma virescens LM2 Fragilariforma virescens LM5
Length Range
15-60 µm
Width Range
6.5-7.0 µm
Striae in 10 µm
20-22

Fragilariforma nitzschioides

(Grunow) Lange-Bert. 2011

Fragilariforma nitzschioides LM3 Fragilariforma nitzschioides LM4 Fragilariforma nitzschioides LM5 Fragilariforma nitzschioides LM6 Fragilariforma nitzschioides LM2 Fragilariforma nitzschioides LM1 Fragilariforma nitzschioides LM7
Length Range
19-54 µm
Width Range
3.5-5.5 µm
Striae in 10 µm
18-25

Stauroforma exiguiformis

(Lange-Bert.) Flower, Jones and Round 1996

Stauroforma exiguiformis LM4 Iwb 0040 06072015 08 Cl Stauroforma exiguiformis LM1 Stauroforma exiguiformis LM3 Stauroforma exiguiformis LM5 Stauroforma exiguiformis LM2
Length Range
4-22 µm
Width Range
3-4 µm
Striae in 10 µm
16-20