Ralfs, J. (1861) Sub-group Diatomeae or Diatomaceae In A history of infusoria including the Desmidiaceae and Diatomaceae British and foreign. Fourth Edition. (Ed. by A. Pritchard), pp. 756-940 plus plates 2 and 4 - 17 (XVII). Whittaker and Co., London.
Plate 17 (Medium resolution)
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