PLATE 43 
Stages in development of Verticillium lycopersici: 
A. —Outer end of conidiophore, showing characteristic branching and aggregation 
of conidia. 
B. —End of conidiophore more highly magnified than in A. 
C. —Sterigmata with conidia forming singly at the tips and adhering in heads. 
D. —Characteristic septation in lower whorls of conidiophores. 
E. —Conidia as seen in air or in water mount. In plate cultures they are found in 
both separated and aggregated conditions. 
F. —Germinating conidia. 
All drawings except A were made on a level with the table with camera lucida and 
Zeiss apochromatic 4-mm. objective and compensating ocular 6 and were reduced 
one-third. 
