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Leaf form transformation in H. difformis

Three weeks ago I transplanted a sprig of hygrophila difformis which
had been growing partly emersed in a fifteen gallon CO2 injected tank.
All the leaves were of the emersed type, 1.5" x 1" and serrated. It
went into a 180 gallon CO2 injected tank and contiued to grow new
leaves of the same form although the entire plant was now submerged.
It looked great.

Last week I noticed that the newest leaves were of the lacey, sub-
merged form. That was when I discovered that I had hygro and not some
unidentified plant. What had happenned was that the DIY CO2 generator
had run out. Leaf transformation was abrupt and definite. There was no
intermediate form. I was surprised. I had thought that leaf form was
dependent upon whether the leaves were growing emersed or submerged,
and not upon CO2 levels in the water.

The CO2 levels should be back to normal now. I'll keep an eye on
the new growth to see if it reverts back to the emersed type.

Re: DIY CO2 and whole wheat flour

I added a tablespoon of wheat flour to a dead DIY CO2 generator
and brought it back to life in a couple of minutes. However, it is
running at a lower output than before and seems to be petering out
after three days.

Dave Whittaker
ac554 at FreeNet_Carleton.ca