The Botrytis Blight of Tulips 



333 



dry, the conidiophore is 

 flattened and twisted on 

 its axis, and is slightly 

 swollen at the base (fig. 33) . 

 The branches of the 

 conidiophore rise from the 

 main stalk at an angle of 

 about 60 degrees, and their 

 ultimate ends, which bear 

 the conidia, are somewhat 

 swollen. The conidia are 

 produced on these swollen 

 ends by a pushing out of 

 the protoplasm in a bud- 

 like manner, but they 



shortly assume a definite shape. When mature, they remain attached 

 by short sterigmata (figs. 34 and 35). Various stages of conidia! formation 



Fig. 34. 



ATTACHMENT OF CONIDIA 

 TULIPAE. X 600 



OF BOTRYTIS 



Camera-lucida outline of conidia shown in fig. 35. 

 Proliferation of the conidiophore has taken place after 

 the formation of conidia on the head. 



Fig. 35. attachment of conidia of botrytis tulipae. X 840 

 Note the short sterigma. These conidia are mature. (Photomicrograph) 



