Diatoms of North AmericaDiatoms of North America
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Compare Fallacia pygmaea

(Kütz.) Stickle and D.G.Mann in Round et al. 1990

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This species is larger, and has more finely punctate striae than F. tenera.

LM scalebar = 10 µm
Fallacia pygmaea LM2 Fallacia pygmaea LM5 Fallacia pygmaea LM1 Fallacia pygmaea LM4 Fallacia pygmaea LM6 Fallacia pygmaea LM3
Length Range
17-38 µm
Width Range
8-13 µm
Striae in 10 µm
24-28 in the center, more fine towards the apices, 32-34

Fallacia tenera

(Hust.) D.G.Mann in Round et al. 1990

Fallacia Tenera 901 M14126 2 Fallacia Tenera 901 M14126 Fallacia Tenera 519 Ps0765 04132016 02 Fallacia Tenera 519 Ps0765 04132016 03
Length Range
9.4-15 µm
Width Range
4.5-7 µm
Striae in 10 µm
16-21