DUDRESNYA. 123 



The development of the sporogenous filaments, their fusion with 

 auxiliary cells, and the origin of cystocarps from the fusion cells will 

 be more readily understood from the diagram in Fig. 49. At 0, after 



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FIG. 49. Diagram showing origin of sporogenous filaments and their union with various auxiliary cells 

 in Dudresnyacoccinea ; parts drawn by means of short dashes indicate trichogyne and sporogenous 

 filaments, while the dots indicate the auxiliary cells ; a, b , c, d, places where sporogenous filaments 

 have united with auxiliary cells. (After Oltmanns.) 



the sporogenous filament had fused with the auxiliary cell, the spo- 

 rogenous nucleus divided, one daughter-nucleus remaining in the fusion 

 cell, the other passing into the end of the filament which is cut off by 



