Studies of Calcification in Plants 



155 



In isolated crystal cells, raphide idioblasts, of the developing frond of the duck- 

 weed, Lemna minor, crystal chambers also develop within a crystal vacuole. How- 

 ever, in this case the chambers are formed within a series of "parallel" paired lamellae 



Fig. 3. A developing raphide idioblast of Eichbornia crassipe; cut transverse to the long axis of the cell. Cell 

 contains ca. 2140 crystal chambers. KMnO, fixation; post stained with lead citrate 



