05-10-2017, 05:51 AM
Join Date: Jul 2007
| | Re: What is Dennerle's C. cordata?
Here is a great quote from Jacobsen and Bastmeijer (2014):
To make a long story short: almost all Cryptocoryne cordata plants in our aquaria today belong to var. siamensis. If you have it growing successfully in your aquarium there is a more than 90% chance that it is var. siamensis. And even if it is not growing well, there is probably still a more than a 90% chance that it is var. siamensis. If it were one of the other varieties of Cryptocoryne cordata it would most likely be dead by now. Of course, if you are one of the few people keeping aquaria with a pH of 4 – 5, you may have something else, but even then there is a good chance that you may have var. siamensis.
Jacobsen, N., and Bastmeijer, J.D. 2014. On Cryptocoryne cordata
. Aquatic Gardener 27(3): 29–39. can be accessed here