Rhopalodia gibbavar. ventricosa (Kuetz.) H. Perag. & Perag. 1900
Length: 54

 Width:10

Costae: 8

Striae: 15






























Collection 1284a

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Authority information

(Kuetz.) H. & M. Perag., Diat. Mar. France, pl. 77, figs. 3-5. 1900. Text, p. 302. 1897-1908 (Patrick and Reimer 1975).

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Taxonomically (Hustedt 1957) and ecologically, this variety is similar to the nominate taxon with respect to ecology (Cholnoky 1968,Patrick and Reimer 1975). In addition, this taxon occurs maximally at pH 7.2, but is found at pH 7.2 - 8.6 ( Hustedt 1938).


  • Type Locality
    Lectotype-10# British Museum 17841 [designated by R. Patrick from type material in Kutzing collection]. (Patrick and Reimer 1975).
  • Synonyms
    Epithemia ventricosa Kuetz., Bacill., p. 35, pl. 30, fig. 9(a, b). 1844 (Patrick and Reimer 1975).
    Epithemia gibba var. ventricosa (Kuetz.) Grun. in V. H., Syn. Diat. Beogique, pl. 32, figs. 4, 5. 1881 (Patrick and Reimer 1975).
    Cystopluera ventricosa (Kuetz.) Kuntze, Revisio Gen. Plant., vol. 2, p. 891. 1891 (Patrick and Reimer 1975).
    Rhopalodia ventricosa (Kuetz.) O. Mull., Bot. Jahrb., 22:65, pl. 1, figs. 20,21. 1895 (Patrick and Reimer 1975).
  • Ecology
    This taxon is usually epiphytic and is found in water with moderate to fairly high conductivity (Patrick and Reimer 1975; Beaver 1981 ).

    Size ranges and morphology

  • Length is 25 to 100 micrometers (Patrick and Reimer 1975).
  • Width is 7 to 10 micrometers (Patrick and Reimer 1966).
  • Costae are 5 to 8 in 10 micrometers (Patrick and Reimer 1975).
  • Striae are are 12 to 16 in 10 micrometers (Patrick and Reimer 1975).