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Klaus Haber wrote:

>The ceratopteris is planted in the
>ground and growing well. 10 to 15 days after creating a new leave, it's self
>get fouling about 10 cm over ground and later, the leave will swim up to the
>watersurface and grows bigger and bigger. This process runs continously with
>all the leaves. To my opinion, Ceratopteris is generally a swimming-plant
>and the time staying in the ground is only a meanstage in order to prepare
>the leaves to swim at the watersurface. Does this theory meet Your
>experience too? I would be glad to hear Your comment

Hi Klaus, first I want to say that your English is just fine!  Welcome to
the group.  

As far as C. thalictroides is concerned, some varieties are happier
completely submerses (under water) than others.  The very fine leafed one,
known in older literature as siliquosa is probably the best for long term
submersion.  The wider leafed ones do exactly what you describe fairly
quickly.  Actually though, their goal, I think, is to get aerial (above
water) leaves.  If the tank is shallow and uncovered, they will happily
remain planted in the bottom, and grow large enough that a large portion of
the plant is growing above the water surface.  Grown in this manner, thay
can get really enormous.  

The only species that I know of that will not tolerate long term submersion
at all is C. pteridoides from S. America.  That one, as far as I know only
grows either floating, or rooted in the mud with its leaves above the surface.