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causes and has a different significance to that in the species we 

 have watched. Evidently we cannot see here, in the cells of the 

 ascogonium an apogamous association of nuclei. This takes place 

 later, as the nuclei passes into the ascogenous hyphae. This 

 delay could, perhaps, he simply explained by saying that the 

 representatives of the Sordariaceae family are more reduced forms. 

 But in the essential feature the facts obtained fully accord with 

 what was observed in Pyronema (Claussen) and Monascus (Schi- 

 korra). Here and there no fusion of the nuclei in the cells of the 

 ascogonium exists. It happens only once, at the formation of the 

 ascus. It would be interesting to verify once more the investigation, 

 in which was described the double fusion of the nuclei. It would 

 be desirable to see, after studying more fully the processes going 

 on at the development of these forms, if the pairing of nuclei there, 

 could not be also explained by the same cause, which was indica- 

 ted by Claussen for the Pyronema, or perhaps these disposition of 

 nuclei in pairs, in species with more or less reduced sexual ele- 

 ments, results from the multiplication of the nuclei, as it is evi- 

 dently observed in Podospora and Sordaria. 



Summary. 



1. The perithecia in P. fimiseda, P. curvula, P. anserina, P. se- 

 tosa, P. coprophila and S. fimicola develop from multicellular spiral 

 coiled ascogonia. The antheridia do not form at all. 



2. In the formation ot ascogenous hyphae several cells of the 

 ascogonium participate. 



3. The vegetative hyphae and cells of the ascogonium are multi- 

 nucleate. The P. fimiseda possesses the greatest number of nuclei, 

 P. curvula possesses the smallest number. 



4. The disposition in pairs of the nuclei, which are observed 

 in the cells of thé ascogonium, is evidently the result of the divi- 

 ding of nuclei. It cannot be considered as the apogamous connection 

 of the nuclei, for by the time of the formation of the ascogenous 

 hyphae, one does not notice this pairing of the nuclei in the cells 

 of the ascogonium; they lie separately. 



5. There is no fusion of the nuclei in the cells of the ascogonium. 



