CHYTRIDIALES 



97 



the periphery of the nucleus but also in other regions of the cytoplasm, 

 an indication, perhaps, that not all these bodies originated from the 

 nucleus. Prophase stages, which resemble those in Cladochytrium repli- 

 cation and Endochytrium operculatum, are recognizable. During early 



Fig. 8. Cytology of Catenochytridium laterale and Rhizophydium coronum 



A-E. Catenochytridium laterale Hanson: A-B, enlarged primary nucleus 

 in the zoospore cyst and catenulate rhizoidal system; C, prophases of second 

 nuclear division ; D, metaphases ; E, anaphases of the second nuclear division 

 in zoosporangium. F-H. Rhizophydium coronum Hanson: F, uninucleate in- 

 cipient sporangium; G, sporangium with nuclei in metaphase; H, prophase 

 figures showing reticulum and chromosomes oriented on the ringlike nucle- 

 olus. 



(A-E, Hanson, 1946a; F-H, Hanson, 1945b) 



prophase the chromatic reticulum is oriented on the nucleolus (Fig. 

 8 H). In later prophase the nuclear reticulum differentiates into elon- 

 gate nodular chromosomes, which may or may not be associated with 

 the nucleolus. Chromosomes appear to number between six and eight. 



