Manchester Memoirs, Vol. Ivii. {igii), A^o. 11. 7 



Abundance of starch is diagrammatically represented by 

 the larger crosses, and less abundant starch by the smaller 

 crosses. Normally starch is chiefly localised in the cells 

 of the endodermis and phloem rays on the cortical side 

 of the vascular tube and in the pith cells adjoining the 

 inner surface of the same. This distribution is represented 

 in the diagram to either side of the infected region. The 



coW. 



cor. par. 

 -%t st.sh.t 



^.-^ phi. 



^^Y^— carnb. 



Text-Jig. 5. T.S. stem with mature pustule, showing distri- 

 bution of starch in and near the tissues entered by 

 the fungus. The dotted line indicates the limits 

 of the mycelium. x 50. 



px.ff: 



limits of the fungal mycelium in relation to the pustule 

 are simply indicated in the figure by the dotted line. 

 There is a marked diminution of starch in the cells of 

 the endodermis and phloem-rays within this area. As 

 regards these cells it is clear that the influence of the 

 fungus is practically restricted to the area invaded. On 



