334 



GENERAL PLANT PATHOLOGY 



Crateria. — C. Schimper uses this term for a leaf blade which de- 

 velops ascidia, as the ascidial white ash discovered by George H. Shull. 



Cyclochoiisis (Fermond). — Division of an axial organ in two direc- 

 tions, so that in place of a simple axis there arise whole clusters of 

 secondary axes. 



Dedoublement (chorisis, doubling). — Congenital division of an 

 organ in which several parts arise out of a single primordium. Lateral 

 and serial dedoublement are distinguishable. 



Fig. 132. — Twin cherries due to dialysis, or disjunction, of the pistil of the flower 

 into two carpels, each of which matures into perfect drupe joined at the base with 

 its fellow. Philadelphia Market, May 25, 1916. 



Defonnation.^ — A malformation, or alteration from the normal 

 kind. A general expression for the irregular formation of an organ, 

 or a complex of organs. 



Degeneration (Masters).— Stunted formation of an organ with 

 which changes of form are associated. An alteration for the worse. 



Dialysis (Ch. Morren, Masters). — The separation of parts normally 

 in one, especially parts of the same whorl. Scarcely distinguishable 

 from adesmy (Fig. 132). 



Diaphysis (Engelmann).— A central proliferation of flowers. If 

 the flower axis elongated beyond the carpels bears another flower, we 



