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Compare Didymosphenia geminata

(Lyngb.) M.Schmidt 1899

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Although D. geminata is large and distinct in shape, some inexperienced users confuse it with species of Gomphonema and Gomphoneis, which may grow attached to surfaces by stalks. Didymosphenia clavaherculis is less capitate than D. geminata and has a more linear and narrow footpole.

LM scalebar = 10 µm
Didymosphenia geminata LM4 Didymosphenia geminata LM1 Didymosphenia geminata LM5 Didymosphenia geminata LM6 Didymosphenia geminata LM3 Didymosphenia geminata LM2
Length Range
65-161 µm
Width Range
36-41 µm
Striae in 10 µm
7-9 in the center valve

Also compare to

Didymosphenia clavaherculis

(Ehrenb.) Metzeltin and Lange-Bert.

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