FUNGI. 



24: 



conidium is sometimes able to effect what the 

 primary conidium was unable to accomplish, namely, 

 the infection of some healthy 

 and vigorous insect. 



Reverting to the hyphal 

 bodies, which we have fol- 

 lowed to the production of 

 conidia, we may observe that 

 resting spores are developed 

 also from them within the 

 substance of the dead insect; 

 such resting spores being 

 formed either as the result 

 of a sexual process, and then 

 called zygospores (Fig. 47), or 

 without any sexual contact, 

 and then azygospores. In the 

 latter case the hyphal bodies 

 can be directly converted into non-sexual resting 

 spores by the formation of two 

 additional cell walls, or else by 

 lateral budding from the hyphal 

 bodies. In the case of sexual 

 production, several methods, dif- 

 fering somewhat from each other, 

 have been observed in different 

 species. The most perfect form 

 yet noticed is one in which the 

 hyphal bodies, lying side by side 

 within the host, conjugate in a 

 direct manner (Fig. 48). At 



r , 1- 1 i. • i* „ Fig. 48.— Hyphal bodies 



first a slight projection appears conjugating. 



Fig. 47.— Zygospores of Fly-mould. 



