Neidium iridis var. amphigomphus (Ehr.) A. Mayer
Length:68

 Width:21

Striae:18

 Puncta:































Collection 1165

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Authority information

(Ehr.) A. Mayer. Denkschr. Bayer. Bot. Ges. Regensburg, 13:30. 1917 (Patrick and Reimer 1966).

Other images



This image was taken utilizing DIC for the specimen above.


More information


This taxon has a broad linear valve and cuneate ends. It is usually a smaller species and the other characteristics are the same as iridis (Patrick and Reimer 1966). This is also located in Lake Superior (E. F. Stoermer collection 1165a).


  • Type Locality
    Real del monte Mexico, New York, Stratford Connecticut, Andower, Boston, and Bridgewater Massachusetts (Patrick and Reimer 1966).

  • Ecology
    This taxon may be found in lakes, ponds, rivers, spring/streams, lagoons, pools, and swamps (Patrick and Reimer 1966; Beaver 1981).

    Size ranges and morphology

  • Length is 65 to 150 micrometers (Patrick and Reimer 1966).
  • Width is 16 to 40 micrometers (Patrick and Reimer 1966).
  • Striae are 15 to 16 in 10 micrometers (Patrick and Reimer 1966).
  • Puncta are around 15 in 18 micrometers (Patrick and Reimer 1966).