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 Fig 



PLATE 55 

 Aphanomyces laevis 



1. Tip of empty sporangium showing spore cluster. 



2. Vegetative threads and two spores sprouting within the sporangium. 



3. Oogonium with diclinous antheridia. 



4. Oogonium with dicHnous antheridia and visible antheridial tube. 



5. Oogonia, the one on left with both diclinous and androgynous antheridia. 



6. Oogonium with mature egg showing structure. 



7. Oogonium clasped by finger-like antheridia; two antheridial tubes clearly visible. 



All figures X 670. 



