Looking at Jacobsen's article (Jacobsen, N., 1992. Die Kultur einiger schwieriger Cryptocoryne-Arten in Buchenlauberde. Aqua-Planta 1-92 : 18-25.---english translation)1 I see the following Crypts mentioned that were found to grow much better in a soil that was partly to mostly semi-decomposed beech leaves:
C. ferruginea, C. fusca, C. cordata, c. villosa, C. longicauda, C. minima, C. pallidinerva, C. shculzei, c. purpurea, C. jacobsenii, C. zonata, and C. elliptica.
Do these make up the complete list of blackwater crypts, or are there more?
Do some of these, such as C. cordata, grow adequately in mostly mineral soils, or do they all only really thrive in high leaf litter soils?
Are there other crypts, not on this list that thrive best on high leaf litter soils?
1. You can see this article on Jan Bastmeijer's Crypt pages in German with pictures or in English without pictures.
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