168 



THE ASCOMYCETES 



B 



Fig. 60. Botryosphaeria ribis. A. Young ascus containing the primary 

 ascus nucleus. B. Binucleate ascus. C. Ascus in the four-nucleate stage. 

 D. Ascus containing eight free nuclei. E. Eight uninucleate ascospores have 

 been delimited. F. Uninucleate and binucleate ascospore. G. Mature ascus 

 with multinucleate ascospores. H and /. The uninucleate cells from the 

 inner pycnidial wall of the Dothiorella stage function as conidiophores. 

 Various stages in the formation and abstriction of multinucleate conidia are 

 shown. /, K, and L. Stages in multinucleate condition of ascospores. 



