Manchester Memoirs^ Vol. hit. (191 3), ^^- H- ^9 

 consulting with Mr. D. Thoday on some of the physio- 

 logical questions involved. 



Summary. 



I The germ tube from the sporidium of Pucania 



malvacenrum penetrates the epidermis of the 

 Hollyhock, sending an infection vesicle mto the 

 cell. This infection vesicle produces branches 

 that grow into the intercellular spaces. 



II The mycelium grows in the intercellular spaces of 



the host and sends haustoria into all the cells of 

 the affected area. Strands of hypha^ pass into 

 the vascular bundles and there is a definite attack 

 on the phloem region, large haustoria being sent 

 into the cells of the phloem parenchyma. 

 III. In the case of the leaf each pustule is related to 



several of the vascular strands. 

 IV. There is a definite diminution in the quantity of 

 starch in the regions invaded by the fungus. 

 V Cells of the host were demonstrated to remain living 



for a considerable time after entry by haustoria. 

 VI The haustoria lie within the protoplasm and grow 

 towards the nucleus. No case of haustoria 

 entering the vacuole was observed. 

 VII Various changes consequent on the entry of the 

 haustoria were noted. The chloroplasts which 

 were regularly disposed in the peripheral cyto- 



