Studies of Calcification in Plants 



153 







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Fi^. 1. Ci\stal llII Irom tht rooi ot } j/ccu ithuli^iia Cr\ital chambers cut in tiins\erse section KMnOj 



fixation; post stained lead hydroxide 

 cc = crystal chambers; cp = crystalloplastids; cv = crystal vacuole; er = endoplasmic reticulum; g = Golgi 



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bodies; Ice = loaded crystal chambers; m — mitochondria; n 



pp = proplasti 



By enlargement and internal membrane proliferation, proplastids in the raphides 

 of Yucca develop into crystalloplastids, characteristic only of crystal cells. These 

 plastids are bounded by a double membrane, the inner of which invaginates at several 

 points to produce the series of internal membranes. Three zones can be observed in 

 these plastids, viz., a relatively dense zone, a transparent zone, and a lamellar zone. 



