Diatoms of North AmericaDiatoms of North America
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Compare Asterionella formosa

Hassall 1850

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Asterionella ralfsii is smaller in length (20 - 60 µm), with a footpole that is much more narrow than the headpole. It occurs in acid waters, pH ranges of 5-6.

LM scalebar = 10 µm
Ill2011 12 A Formosa2 Ill2011 12 A Formosa4 Ill2011 12 A Formosa6 Ill2011 12 A Formosa5 Ill2011 12 A Formosa1 Ill2011 12 A Formosa3
Length Range
45-68 µm
Width Range
1.1-4.5 µm
Striae in 10 µm
24-28

Asterionella ralfsii var. americana

Körner 1970

Asralf Amer Mbe725B 3460 192 2 Asralf Amer Mbe725B 3001 166 7 Asralf Amer Mbe725B 2961 164 5 Asralf Amer Mbe725B 2800 155 5 Asralf Amer Mbe725B 2461 136 7 Asralf Amer Mbe725B 1884 104 6
Length Range
104.6-192.2 µm
Width Range
1.5 to 2.8 at the valve center µm
Striae in 10 µm
>40

Also compare to

Asterionella ralfsii

W.Sm.