THE SYNCHYTRIAN NUCLEUS 



79 



gave an account of the first mitosis in the soral sporangium 

 of SyncJiytrium decipiens of Falcata comosa, the hog pea-nut, 

 an American plant. 



Nuclear Divisions in the Sorus. The division of the 

 primary nucleus of S. decipiens is mitotic. The nuclear 





i I 



N-T5 



E 



FIG. 20. THE PRIMARY NUCLEUS OF SYNCHYTRIUM DECIPIENS. A, 

 Parasite in an epidermal cell ; B, nucleolus and part of nuclear 

 membrane, masses of chromatin are emerging from one side of the 

 nucleolus ; C, spireme stage, nucleus surrounded by a chromidial 

 zone ; D, spindle forming in middle ; E, mitosis nearing metaphase. 

 After F. L. and A. C. Stevens. 



membrane being gradually dissolved (from the outside the 

 authors thought), becomes gelatinous and stains more 

 deeply. The nucleolus from one side discharges its chromatin 

 in large lumps, Fig. 20, B, and these appear to break up 



