274 



PLANT DISEASES 



inoculated, to secure for the fungus a foothold from which 

 it can attack neighbouring plants, and, in the course of the 

 season, victimise most or all the plants in the neighbour- 

 hood. 



It 



Fig. 7T.— Vertniculayia circinans. i, onion 

 attaclted by Vermicularia ; 2, one of the black 

 tufts of the fungus, x 50 ; 3, portion of a tuft show- 

 ing the curved conidia borne at the tips of slender 

 threads or conidiophores, also the long black 

 spines, X250. 



Berkeley, Gard. Chron., 1851, p. 595, fias. 

 Stoneman, Bot. Gaz., 1898, p. 98, fig. 16. 



