Cryptocoryne cordata Griffith var. diderici (de Wit) N. Jacobsen

Cryptocoryne cordata var. diderici is first described by de Wit (1970) as C. diderici based on material imported in 1960 by J. Liet, originating from somewhere in "Malacca boreali", the Northern part of W. Malaysia. This plant was in culture for some time but disappeared soon. In 1985, Jacobsen and Bogner collected in Central Sumatra (Indonesia) two other C. cordata like plants. These plants (NJ 85-23/26) are interpreted as C. cordata var. diderici. Recently, 2009, Kishi collected another one in Jambi, Sumatra. Some collections of C. cordata var. grabowskii from Borneo are quite close to C. cordata var. diderici as they may lack the purple zone in the upper kettle. A new study on the varieties in C. cordata is underway.

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Cryptocoryne cordata var. diderici. Dark green leaves, the lower side purplish, with a more or less heart shaped base. TYPE material
coll. J. Liet s.n.
photo de Wit
The limb of the spathe shows a broad yellow throat, with a more or less distinct collar. The surface of the limb is a bit rough and brownish.
coll. J. Liet s.n.
photo de Wit
The purple spotted appendix (just above the male flowers) of C. cordata var. diderici is just to be seen in this picture.
coll. J. Liet s.n.
photo de Wit
A plant from the collection of Blass, cultivated in Copenhagen in the 1970´s. The plant is probably from the same source (Liet) as de Wit's plant.
photo Jacobsen
       
didNJ85-23m.jpg (3031 bytes)
In 1985, Jacobsen and Bogner collected C. cordata var. diderici in Sumatra (Indonesia)
coll. Jacobsen NJ 85-23
photo Jacobsen
A 'manually' opened limb of the spathe. This is a wild collected specimen. No plants survived in cultivation.
coll. Jacobsen NJ 85-23
photo Jacobsen
The plants of the other collection are widespread in cultivation. Note the rather small leaves with on the upper surface fine red dots, giving it a purplish glow.
coll. Jacobsen NJ 85-26
photo Ehrenberg
A close up of the leave, showing the fine red dots on the surface (the ruler in cm). In emersed cultivated specimen this is a distinct feature.
coll. Jacobsen NJ 85-26
photo Bastmeijer
       
did2276m.jpg (5671 bytes)
A full grown specimen of NJ 85-26 cultivated by Piet van Wijngaarden. Note the red colour of the limb and the smooth leaves.
coll. Jacobsen NJ 85-26
photo van Bruggen
The limb of the spathe has a short tail, what is a typical feature of C. cordata var. diderici. This spathe just opened and will spread in a couple of hours.
coll. Jacobsen NJ 85-26
photo Bastmeijer
With special lighting, the rough surface of the limb is enhanced. Note also the 'swollen' throat zone, making a more or less distinct collar.
coll. Jacobsen NJ 85-26
photo Bastmeijer
A very deep red limb of the spathe.
coll. Jacobsen NJ 85-26
photo van Bruggen
       
Cultivated in a 'swamp' with decomposing leaves of the beech tree.
coll. Kishi 09-01
photo Bastmeijer
The spatha dismounted. The ruler is in cm.
coll. Kishi 09-01
photo Bastmeijer
The limb of the spathe with a short tail. There is no clear collar.
coll. Kishi 09-01
photo Bastmeijer
The limb is a bit rough. Note the fine red dots, increasing towards the margin.
coll. Kishi 09-01
photo Bastmeijer
       
A view in the opened lower part of the spathe ('kettle'). Note the slight purple coloured inside wall of the kettle.
coll. Jacobsen NJ 85-26
photo van Bruggen
A dark purple appendix of the (rather short) spadix. The inside wall of the kettle is white.
coll. Jacobsen NJ 85-26
photo van Möhlmann
The inside wall of the kettle is slight purple at this inflorescence. The stigma's are not as white because of they become wet after a few days. 
coll. Jacobsen NJ 85-26
photo Bastmeijer
In Kishi's plant the kettle wall is almost white, it has only a few very small red dots.
coll. Kishi 09-01
photo Bastmeijer
       
Close up of the male flowers and the purple dotted appendix, partly hidden behind the valve..
coll. Kishi 09-01
photo Bastmeijer
Close up of the female flowers with the yellow olfactory bodies. Note the few red spots on the naked part of the spadix.
coll. Kishi 09-01
photo Bastmeijer
Drawing of C. cordata var. diderici in de Wit 1970, 1990. based on the the material from Liet.
drawing Ike Zewald
Known distribution of C. cordata var. diderici. The question mark refers to the uncertain location mentioned as 'North of Malacca'.
       

C. cordata var. diderici differs form the the other var´s of the cordata group by a more rough limb of the spathe that varies in colour from brownish to reddish. The inside wall of the kettle is white to purple (C. cordata var. cordata may have some fine red dots) and the top of the spadix is purple, like C. cordata var. grabowskii. The latter has often a distinct purple zone in the upper part of the kettle.  
Cultivating is rather simple in emersed or semi-emersed conditions. Probably it is a good aquarium plant, but as far as I know, nobody tried it.
Etymology. The plant is named after Dirk, the first name of the father of De Wit.

See also the other Cryptocoryne of the  cordata-group.

Updated May 2013

Literature: see the cordata-group.