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Mycologia 



confined to one end, where growth alone proceeds. After a time 

 this protoplasm collects more closely into the tip and is cut off 

 by a cross wall. This tip cell then bends around just as in ordi- 

 nary division, and remains for a time attached by a point. Later 

 it drops away and becomes a vegetative cell of normal size. In 

 text fig. i a, such a hypha is shown with its protoplasm cut off 

 at one end. While this figure was being drawn the end cell was 

 seen to bend back as shown in text fig. i b. Occasionally there 

 may be seen long rows of cells as shown in text fig. 2 recalling 

 certain figures of Lindner's for S. Pombe. These finally break 

 up into separate cells. 



Fig. 2. Elongated cells of S. octosporus in rows beginning to separate. X 1080. 



When fusion is to take place the procedure is exactly the same 

 as in vegetation cell division, up to the point of the bending back 

 of the cells. Then, instead of separating, the partition becomes 

 absorbed and the contents of the two cells fuse. Usually, the orig- 

 inal position of the cell is retained and the result is the forma- 

 tion of a double sac that resembles a pair of saddle bags (figs. 



