i 3 6 DISEASES OF CULTIVATED PLANTS 



palisade tissue of a leaf, and as seen to the naked eye give a 

 delicate bloom-like appearance to the surface they are seated 



Fig. 31. 1, /> fbrmans, showing asci in various stages of 



development bursting through the cuticle of the leaf; 2, ascus of Exoascus 



m, showing stalk-cell at base of ascus, and eight spores ; 3, ascus of 

 Tap/in na aura filled with secondary spores produced by budding of the 

 ascospores ; 4, - iew of mycelium of Tapkrina Sadebeckii on 



f of Almr^ glutinosa; 5, differentiation of fertile or ascogenous 

 hyphae from vegetative hyphae of Tapkrina Sadebeckii. (rigs. 4 and 5 

 after Sadebeck.) All highly mag. 



upon. The asci at first contain eight spores, but in the 

 majority of instances these spores germinate in the ascus, 

 by the process of budding or germination, as in yeasts, 



