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Welcome to the Diatom Image Database! The Periphyton Group at Florida International University created and maintains the Diatom Image Database, which includes over 980 diatom taxa found in the greater Everglades region of south Florida. Please send questions or comments about the Diatom Image Database to Franco Tobias .

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Map of south Florida Loxahatchee (LOX) WCA 2A WCA 3A Biscayne Bay Shark River Slough (SRS) Taylor Slough (TS) Florida Bay Everglades National Park (ENP) Everglades National Park (ENP)

Fragilaria ulna [danica group]

Fragilaria ulna [danica group]

(Nitzsch) Lange-Bertalot
Patrick, R. & Reimer, C. W (1966). The Diatoms of the United States I. Monographs of the Academy of Natural Sciences of Philadelphia. pp. 151; 176-177 [pl.7:10]
Synedra danica Kützing 1844; Synedra ulna var. danica (Kützing) Van Heurck 1885
Ecological Preference:
Valve is linear-lanceolate, with swollen, somewhat capitate valve ends, and narrow pseudoraphe; transverse central area does not usually reach the valve margins; jelly pore is present; striae are parallel; length is 120-200µm, breadth is 5-8µm; striae count is 9-10 in 10µm
  • Transect Project

  • Sample localities:
  • Water Conservation Areas (WCAs)