— 132 — 



was always more abundant than on agar-agar. To obtain simulta- 

 neously large quantities of fruit-bodies it was useful, taking into 

 consideration the slow growth of the mycelium, to infect the nou- 

 risliing medium Avith several bits of gelatine with sections of 

 hyphae, placing them at a short distance from each other. The 

 fungus gave also a large quantity of picnidia, resembling those we 

 find in P. coprophila. 



The formation of the perithecia takes place here, quite differently 

 than as described above, for the species of Podospora and Sordaria. 

 Some of the cells of the mycelium are divided by transversal walls 

 and give off Uyo or three very short, thickwalled cells (fig. 45). 

 Sometimes from the same a whole range of such short cells sepa- 

 rates, as the space on which the dividing takes place is compara- 

 tively big (fig. 46). Cells thus formed continue to divide by trans- 

 versal and longitudinal walls. They give rise at the same time to 

 a small quantity of side outgrowths, wliich branch, divide and 

 participate, with the cells, which have produced them, in the for- 

 mation ot small spherical bodies (fig. 47). In case, when the quan- 

 tity of cells given off at first is very considerable, these spherical 

 bodies, which look like knots, lie closely touching each other and 

 are even covered later with a common sheath, developed out of 

 the side branches of the neighbouring short cells. One can often 

 see growing together in such a manner two knots of quite diffe- 

 rent age. 



All the cells of the knot are at first alike in size and contents; 

 only the cells of the peripheric layer has thicker walls. The cells 

 lie very closely touching each other (fig. 47). They continue to 

 divide and at same time greatly diminish in size (fig. 48). When 

 the growing in such manner knot attains considerable dimensions, 

 his central cells begin to differ somewhat from the rest, not so 

 much in size, as by their contents, which are denser (fig. 49). The 

 cells of the knot, Avhich lie next to the periphery, are disposed at 

 this stage of development as closely as before, but nearer the centre, 

 the tissue becomes more friable. As the knot groAvs the cells with 

 dense contents, which lie in the centre, become more and more 

 prominent (fig. 50, 51). At the same time, between them and the 

 smaller neighbouring cells, remain quite free, not filled spaces, that 

 is cavities are gradually formed. At the same time appear in great 



