Well, it certainly depends on how rare is defined:
Rare in cultivation? There are a few populations of which only a single specimen is left in cultivation.
Rare in nature? There are a few populations which are known to be extinct in nature for sure.
To cut a long story short: Make sure to distribute any runners to other enthusiasts! That helps to reduce the risk of loosing rare crypts...
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| C. x timahensis is an Über-rare emersed-only crypt.
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It does grow submersed without problem - does well in a blackwater tank.
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it's only found in one small pool in Singapore.
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Yup. Avoid obtaining plants collected in nature! This and many other crypts are being propagated and runners from cultivation tend to be much more stable during shipping.