PLATE XLVIII 



Rheo sporangium aphanidermaius: 



Fig. I. — Section of presporangium showing intermediate stage of vacuolization. 

 X2,ooo. See also Plate XLIV, figure 13. 



Fig. 2, 3. — Developing oogonia and antheridia. Xz.ooo. See also Plate XLV, 

 figure 8. 



Fig. 4. — Oospore after nuclear fusion showing accumulation of food material at 

 the center. X2,ooo. See figures 6, 7, and 10 for earlier stages of food body. 



Fig. 5. — Fertilized egg showing functional nuclei within the deeper stained central 

 portion. X2,ooo. 



Fig. 6. — Fertilized egg showing fimctional nuclei in juxtaposition within central 

 mass. Food bodies (decolorized) appear as vacuoles in the cytoplasm. Note the 

 thickness of the wall, unusual at this stage. X2,ooo. See also figure 10. 



Fig. 7. — Fertilized egg showing nucleus after fusion within the deeper stained 

 central portion and position of decolorized food bodies. X2,ooo. 



Fig. 8. — Typical fertilization: Functional egg nucleus in deeply staining center of 

 oosphere; others degenerating at the -periphery. Functional antheridial nucleus 

 entering the oosphere; others degenerating in the antheridium. X2,ooo. 



Fig. 9. — Young oogonium and antheridium showing the central vacuole and the 

 peripheral arrangement of the nuclei. X2,ooo. 



Fig. 10. — Fertilized egg: Oospore wall formed but not thickened, ftmctional nuclei 

 in juxtaposition within central mass, and food bodies in surroiuiding cytoplasm. 

 X2,ooo. See also figure 6. 



