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Cryptocoryne jacobsenii de Wit |
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A 'difficult' species in the sense that we don't know its distribution and that
different forms are interpreted to belong to this species. More research is necessary to
clear up these problems. As far as I know, there are no plants of either forms in
cultivation.
Click on the picture to get the full image (ca. 50 kB) |
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Cryptocoryne jacobsenii was shipped to
Europe in the 70's. The origin was said to be the Malay peninsula / Sumatra. This is a
picture of the TYPE specimen.
unknown locality, cult. NJ 2864
photo Jacobsen |
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The leafs of C. jacobsenii are rather
small with some transverse markings, common in many species.
unknown locality, cult. NJ 2864
photo Jacobsen
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The limb of the spathe of C. jacobsenii is quite typical. The surface is rough with prominent protuberances, there is a distinct
collar and the throat is red / yellow with fine red spots.
unknown locality, cult. NJ 2864
photo Jacobsen |
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Opened kettle
unknown locality, cult. NJ 2864
photo Jacobsen
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The plant is rather difficult to grow on the
long term, at now there are no cultivated specimens left in Europe.
unknown locality, cult. B 356
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This plant is up to now regarded as C.
jacobsenii. In emersed culture, C. jacobsenii is a small plant, the leaf
blades around 5 cm long and 2 cm wide, dark green, marmorated, the lower side pale green
to reddish.
unknown locality, cult. B 414
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A close up of the limb of the spathe. Note the
rough, irregular structure of the limb of the spathe, the clear collar and the dotted
throat.
unknown locality, cult. B 414
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Opened kettle
unknown locality, cult. B 414
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In 1985 Jacobsen and Bogner collected in Central
Sumatra a broad leafed plant with a limb of the spathe that is to be compared with C.
jacobsenii (NJ 85-27). Today we see this plant as (or near to) C. scurrilis.
coll.and cult. NJ 85-27
photo Jacobsen
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Drawing of C. jacobsenii after NJ 2864
in De Wit (1990).
drawing Juliet Williamson
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The plant is named after professor Niels Jacobsen, Denmark, who made very many
contributions to the knowledge of Cryptocoryne.
Updated May 2008 |
Literature.
- Arends, J.C., Bastmeijer J.D. & Jacobsen, N., 1982.
Chromosome numbers and taxonomy in Cryptocoryne (Araceae).II. Nord.J.Bot. 2 : 453-463.
- Jacobsen, N., 1977. Chromosome numbers and taxonomy in Cryptocoryne (Araceae), Bot.Notiser
130 : 71-87.
- Jacobsen, N., 1982. Cryptocorynen, Alfred Kernen Verlag, Stuttgart.
- Jacobsen, N. & J.Bogner, 1987. Die Cryptocorynen der Malaiischen Halbinsel (4.Teil,
Schluss), Aqua-Planta 3-87 : 96-103 (+ cover).
- Jacobsen, N., 1992. Die Kultur einiger schwieriger Cryptocoryne-Arten in Buchenlauberde,
Aqua-Planta 1-92 : 18-25.
- Wit, H.C.D.de, 1976. Drie nieuwe Cryptocroryne-soorten, Het Aquarium 46(7) : 177.
- Wit, H.C.D.de, 1990. Aquarienpflanzen, 2. Auflage. Ulmer, Stuttgart. ISBN 3-8001-7185-6.
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