by Jan D. Bastmeijer
 
These pages are on the cultivation and taxonomy of plants of the genus Cryptocoryne (Araceae)
 
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Cryptocoryne yujii Bastmeijer

Mr. Yuji Sasaki from the Rayon Vert Aquarium, Kumamoto, Japan, is a very successful collector of Cryptocoryne. In 2002 he found this species in Sarawak in the neighborhood of Sibu in several streams. This is quite amazing because this area is well investigated by several collectors.

Click on the picture to get the full image (ca. 50 kB)

Fresh collected plants of C. yujii. Bright green leaves up to 50 cm, without any purple and a very distinct spathe.
coll. Sasaki M-SINN
photo Sasaki
The spatha has a long twisted limb with a striking white color and a clear red purple collar.
coll. Sasaki M-SINN
photo Sasaki
The throat is deep purple and can be more or less intense in color and the colored zone can vary in size.
coll. Sasaki M-SINN
photo Sasaki
Close-up of the limb of the spathe. Note the rugose inner surface of the limb.
coll. Sasaki M-SINN
photo Sasaki

       
Small stream near Sibu where C. yujii grows. Note that there is not much shade.
coll. Sasaki M-SINN
photo Sasaki

A big stand of C. yujii. The water is rather cloudy (for the moment?) and is running slowly.
coll. Sasaki M-SINN
photo Sasaki
The leaf blade is grass green at the upper side. The lower side is a bit paler. Size up to 12 x 7 cm.
coll. Sasaki M-SINN
photo Sasaki

The throat of this inflorescence is deep purple red. Note the 'reversed'  twist of the limb.
coll. Sasaki M-SINN
photo Sasaki

       
A cultivated specimen of C. yujii. The throat has a small reddish zone. The leaves are almost smooth.
coll. Sasaki M-SINN, cult. B980

Close up of the irregular rugose surface of the limb of the spatha. This is very typical for C. yujii.
coll. Sasaki M-SINN, cult. B980
The lower part of the tube (kettle) with the male (top) and female flowers.
coll. Sasaki M-SINN
photo Sasaki

Distribution of C. yujii in Sarawak, where it grows both North and South of the main Rajang river, near Sibu.
       

Cryptocoryne yujii is named after its discoverer, Mr. Yuji Sasaki.
The chromosome number 2n = 34. Comparing C. yujii with other species from Borneo, one might think of C. longicauda (2n = 30) and C. fusca or C. ferruginea (both 2n = 34). This species however is very distinct in the rugose spathe and the long, narrow kettle.
The plant seems to be rather easy to cultivate, results both in Japan and the Netherlands are hopeful.

Updated January  2003

Literature.
Bastmeijer, J.D., 2002. Cryptocoryne yujii Bastmeijer (Araceae), eine neue Art aus Sarawak. Aqua Planta 27(4): 145-146. (Document service)

 
 
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