EUASCOMYCETES 



181 



ascogonium. It winds several times around the ascogonium and cuts off 

 a uninucleate apical cell which swells slightly (Fig. 113, 1). 



Meanwhile the number of nuclei in the ascogonium have reached 

 about 64. The apical cell comes into open communication with the 

 ascogonium (Fig. 113, 2). Dangeard could not see nuclear migration, 

 however, and concluded that the male nucleus remains in the antheridium 



Fig. 114. — Aspergillus herbariorum. A. Conidiophore. B to F. Development of peri- 

 thecium. G. Group of young asei. H. Mature ascus. (After Kny and Bary.) 



and degenerates. The ascogonium divides into numerous binucleate 

 cells, however, each of which may develop ascogenous hyphae (Fig. 113, 

 3). 



Thus P. vermiculatum differs from P. crustaceum in two respects. 

 Both copulation branches are differentiated morphologically as well as 

 dynamically into antheridium and ascogonium ; secondly, the appearance 

 of the antheridium is retarded. It appears a long time after the formation 

 of the ascogonium, when the latter has already become multinucleate, 



