Didymosphenia geminata (Lyngb.) M. Schmidt 1899
Length:124

 Width:25

 Striae:9








































Collection C-5

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Authority information

(Lyngbye 1819) M. Schmidt 1899 in Schmidt et al. 1874-__, 214:7-9 ( VanLandingham 1969)

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  • Synonyms (Patrick and Reimer 1975)
    Echinella geminata Lyngb., Tent. Hydrophyt. Danicae, p. 210, pl. 70, fig. D. 1819.
    Gomphonema geminatum (Lyngb.) Ag., Syst. Alg., p. 12. 1824.
    Didymosphenia geminatum (Lyngb.) M. Schmidt in A.S., Atlas Diat., pl. 214, figs. 9 10. 1899.


  • Ecology
    This taxon prefers cool water of low conductivity (Patrick and Reimer 1975) and may be useful as indicators of increases in salt concentrations in the Great Lakes (E. F. Stoermer, personal communication).

    Size ranges and morphology

  • Length range: 100 to 140 micrometers (Patrick and Reimer 1975).
  • Breadth range: 25 to 43 micrometers (Patrick and Reimer 1975).
  • Striae: 8-10 striae per 10 micrometers (Patrick and Reimer 1975).

  • Other morphological features
    2 to 5 stigmata on one side of the central nodule (Patrick and Reimer 1975).