136 



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. i, Exoascus deformans, showing asci in various stages of 

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

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

 Taphrina aurea filled with secondary spores produced by budding of the 

 ascospores ; 4, surface view of mycelium of Taphrina Sadebeckii on 

 leaf of Alines glutinosa ; 5, differentiation of fertile or ascogenous 

 hyphae from vegetative hyphae of Taphrina Sadebeckii. (Figs. 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, 



