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On Tue, 18 Jul, 2000 Susi Barber wrote: > I have Ceratophyllum submersum (Tropical Hornwort), which has no roots, and is > a floating plant. "Demersum" I think means it should be grown emersed, ie in > the air, not underwater - experts please advise.
A related plant, Ceratophyllum submersum, is described in Flora Europaea as being capable of growing in brackish estuaries, but this species is strictly freshwater.
 See also: Water, Plants, Aquarium, Species, Substrate
  
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