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Re: Isoetes spp.

As Ive mentioned previously, Isoetes are rather unusual plants. They are 
capable of absorbing much of their CO2 from the sediment ... this is one 
plant that does NOT require elevated CO2 levels in the water but rather 
in the sediment. They are also capable of fixing CO2 24 hours a day and 
efficiently refixing respired CO2. At night they do this by attaching the 
CO2 to organic acids (called malic acid) and then reducing the CO2 to 
sugars in the daytime when light energy is available.
The are not flowering plants but a type of fern with both megaspores and 
micropspores. The sporangia can be found at the base of mature leaves and 
if the two types of spores are mixed together you can produce hundreds of 
tiny new plants.
They usually grow in water that is extremely low in DIC.