22 Robinson, Piucinia vuilvacearum and its host plant. 



Fig. 8. — A normal cell of the starch-sheath in longitudinal 



section, shows nucleus rich in chromatin granules, 



surrounded by large starch grains. x 800. 



Fig. 9. — A similar starch-sheath cell entered by two branched 



haustoria, one of which is in contact with the 



enlarged nucleus. x 800. 



Figs. 10 and 11. — Similar cells to Fig. 9, showing remnants of 

 leucoplasts near to the nucleus which in Fig. 11 is 

 shrivelled. x 800. 



Fig. 12. — A portion of a phloem-parenchyma cell entered by a 

 forked haustorium, with divergent branches lying 

 in the somewhat contracted protoplasm. x 800. 



Fig. 13. — .\ similar cell to Fig. 12. which shows one branch of 

 the haustorium in contact with the hypertiophied 

 nucleus. x 800. 



