DISEASES IN GREENHOUSE in 



At an early age the hyphse begin to form 

 chlamydospores or resting spores. These 

 are round hyaline bodies often filled with 

 oil globules and are formed in the center 

 of the hypha. Usually also the chlamydo- 

 spores are born at the tip end of the hyphse 

 in chains of twos, threes, and even fours. 

 Old cultures consist largely of a mass of 

 chlamydospores. There are also two other 

 types of spore forms, and these appear as 

 early as the third day in the pure culture. 

 These are micro-conidia or small one-celled 

 spores, and macro-conidia or large cycle- 

 shaped spores, varying from two-celled to 

 four-celled. The usual form is three- 

 celled. In old cultures the macro-conidia 

 shrink so that the septa become slightly 

 prominent. These old macro-conidia soon 

 lose their protoplasm, or they broak up, 

 presenting a granular appearance. In 

 young cultures the outer wall of the chla- 



