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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)

Fragilariforma virescens capitata

Fragilariforma virescens capitata

(Ralfs) Williams & Round
Patrick, R. & Reimer, C. W (1966). The Diatoms of the United States I. Monographs of the Academy of Natural Sciences of Philadelphia. pp. 119; 168-169 (pl.3:7-9)
Fragilaria pectinalis Ehr. 1839 (questionable); Fragilaria virescens Ralfs 1843; Fragilaria aequalis Heib. 1863; Fragilaria virescens var. producta (Lagerst.) DeT. 1891; Fragilaria aequalis var. major Temp. & Perag. 1910
Ecological Preference:
Frustules form long, straight filaments; valve has linear or slightly convex margins and attenuate-rostrate apices (this variety has distinctly rounded ends); pseudoraphe is very narrow, with no central area; striae are fine; length is 12-120µm, breadth is 5-10µm; striae count is 15-19 in 10µm
  • Transect Project

  • Sample localities:
  • Shark River Slough (SRS)