Diatoms of North AmericaDiatoms of North America
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Compare Fragilariforma horstii

E.Morales, Manoylov and Bahls 2012

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Fragilariforma horstii has smaller valves and a higher stria density than other species of Fragilariforma with a cruciform shape. Staurosira inflatissima should also be compared.

LM scalebar = 10 µm
Fragilariforma horstii LM1 Fragilariforma horstii LM2 Fragilariforma horstii LM3 Fragilariforma horstii LM4 Fragilariforma horstii LM5 Fragilariforma horstii LM6 Fragilariforma horstii LM7
Length Range
6.3-19.9 µm
Width Range
6.1-11.7 µm
Striae in 10 µm
34 in center to 40 ends

Also compare to

Staurosira inflatissima

(Hust.) Metzeltin and Lange-Bert. 2007