FIG. 159. Spongospora scabies, i , tuber showing wounds made during early 

 development of the parasite ; 2, section of same potato ; 3, mature spore- 

 balls of Spongospora ; 4, amoeboid bodies of Spongospora in a potato cell, the 

 starch has already disappeared ; 5, showing the amoeboid bodies fused to 

 form a plasmodium in a potato cell ; 6, a more advanced stage of the 

 plasmodium ; 7, the plasmodium in a still more advanced stage, showing its 

 substance broken up into a layer of spores forming a ' spore-ball ' ; 8 and 9, 

 free spore-balls that have escaped from the cells of the potato ; 10, cells 

 forming a spore-ball; n, amoeboid bodies that have escaped from the cells 

 of a spore-ball ; 12, portion of plasmodium showing nuclei. Figs, i and 2 

 nat. size ; the remainder highly mag. 



