— 121 — 



gâtions, which, relate to the morphological side of the development 

 of the peritheciiim of the P. fimiseda. It remains only to state that 

 the development of the fruit-body takes place without any partici- 

 pation of the male sexual cells. The antheridia are not produced 

 ât all. One could not find them either at the earliest stages of 

 development of the ascogonium, or later at the beginning of the 

 interlacing of these by the hyphae. 



Passing to the description of the cytological features, which 

 appear at the development of the perithecium of the Podospora, 

 one can first of all notice, that the cells of the young mycelium, 

 which are formed during the germination of the spores, contain a 

 considerably larger quantity of nuclei, than the cells of a developed 

 mycelium. While the quantity of nuclei in the latter does not 

 exceed the usual number 6 to 8, the cells rising from the sphe- 

 rical swelling, lying at the head of the spores, contain not less 

 than twenty nuclei (fig. 1). As they are often arranged in pairs we 

 <îonclude that the process of the dividing ot the nuclei proceeds very 

 vigorously, but this process of dividing did not come under our 

 observation. The size of the nuclei is different, some of them are 

 larger than others (fig.^l2). 



The young ascogonia, filled with dense protoplasma, are also 

 from the beginning multinuclear and their nuclei at first cannot be 

 distinguished by their dimensions, from those of the ordinary hy- 

 phae (fig. 13), but afterwards, they considerably augment in size, 

 with the growth of the cells of the ascogonium itself (figs. 14, 15). 

 Sometimes they collect in small groups, though oftener they are 

 disposed, more or less equally, over the whole cell. One could not 

 even once notice liere any tendency to arrange themselves in pairs, 

 as in the Pyronema, nor any fusion of the nuclei of the ascogo- 

 nium. Not long before the formation of the ascogenous hyphae in 

 the nuclei of the ascogonium we could notice a certain differen- 

 tiation. Part of them becomes larger than others and the nucleolus, 

 which is in the centre of such nuclei, becomes very strongly stained. 

 The nuclei of smaller dimensions, are more or less evenly stained 

 and lie principally in the lower wide cell of the ascogonium (fig. 16), 

 tliough they can be found also in other cells, among larger nuclei. 

 The difference of their dimensions at first is not very perceptible 

 ^fig. 15). Among the nuclei one can also find a gradual transition 



