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Probaly, if it's not on the list, it should be.

The Egeria densa as well as Hydrilla both do what is called indirect bicarbonate use.

Algae typically do direct.
pH differences between the ab and adxials leaf surfaces can range up 4 pH units. The plant pumps out lots of H+'s on the lower abaxial leaf side which changes the HCO3 to CO2 for plant uptake, but that occurs out in the water, not on the plant's leaf surface through direct enzyme action.

These plant/genera are not like most of the plants we keep. For one, they don't have stomata. Leaves are 2 cells thick. Use cytoplasmic streaming under high light just to name a few.

Regards,
Tom Barr
 

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CO2 ccm's is likely what he meant.

CCM=> search APD=> Carbon concentrating mechanisms.
Big with algae.

C4 does it spacially, CAM does it temporally. Any malate type storage can act as a CCM to increase RUSICO effieincy.
Indirect vs direct Bicarb use is a sub heading perhaps

No sure what he meant based on what you said here with lower plants.
Email me off list for more on CO2.

Regards,
Tom Barr
 
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