EREMASCACEAE IMPERPECTAE 



193 



protein. Some of these adult cells are transformed into hypnospores. The 

 cell appears dark in color, often slightly larger than the other cells, the wall 

 may not be thickened, but is usually darker in color. The cells often contain 

 fat globules and small dark granules. 



Finally the degenerate, senescent, or dead cells (shadow cells of Shrews- 

 bury, Fig. 40, 4) appear to be empty of contents, often with numerous fat 

 globules in the vicinity of the ruptured cell. Other cells seem to be filled with 

 fat globules. Perhaps the accumulation of fat reaches a stage where it cannot 



Fig. 40. 



-Showing' Shrewsbury's cell types in Hansenula. 1, young cell ; Z, S, adolescent cells ; 

 4, 5, adult cells ; 6-9, senescent cells ; 10, pseudomycelium. 



be utilized and causes the rupture of the wall. Occasionally these shadow 

 cells may be artefacts caused by the mechanical rupture of young thin-walled 

 cells which are filled with small fat globules. 



Sprouting may be from any portion of the cell in the true yeasts, but 

 even among them it is often bipolar as it is in all members of the group under 

 consideration. In very young, thin-walled cells before polarity is well estab- 

 lished, sprouting may occur at other points. In thick-walled cells sprouting 

 is almost always unipolar. In some genera verticils of sprouts may develop 



