92 Scientific Proceedings, Royal Dublin Society. 



5. Conidiophores of V. albo-atrum showing the spheres of conidia on the 



tips of the verticillate branches, x 60. 



6. Cut portions of affected potato-stalks which had been kept moist for a 



few days, showing the tufts of mycelium of V. albo-atrum growing 

 out at the cut ends of the wood vessels. 



7 An affected tuber with a thin slice of its heel-end removed, showing the 

 discolouration of the tissues due to the presence of V. albo-atrum. 



