ASEXUAL REPRODUCTION 



265 



simultaneously from different parts of the cell and these may give 

 rise to new buds before they have become detached from the parent 

 cells, so that a small cluster of cells is formed (Fig. 109f/). Repro- 



ASCOMYCETES 



ENDOMYCOPSIS forms both myce • 

 lium and budding single cells. The 

 mycelium forms asci by fusion of 

 contiguous cells. Losing the power 

 to form spores, it becomes: 



Losing the power to form mycelium, 

 it becomes: 



SACCHAROMYCES, ZYGOSACCHA- 

 ROMYCES, HANSENULA etc., not 

 forming mycelium, existing as single 

 budding cells. Ascospores are produced 

 in a cell formed by two conjugating cells 

 or in its progeny. Losing the power to 

 form spores, they become: 



FUNGI IMPERFECTI 



, CANDIDA. It forms both mycelium 

 and single budding cells, but fails to 

 form ascospores. Losing the power 

 to form mycelium, it becomes: ■ 



CRYPTOCOCCUS and other asporog - 

 enous genera. These yeasts grow as 

 single cells, reproduced by budding, do 

 not form either mycelium or spores. 



Fig. 108. 



duction by fission is the same process as occurs in bacteria. After 

 sufficient elongation, a crosswall is. laid down, and this then splits 

 in the middle, giving rise to two cells of equal size (Fig. 109a). In 

 the combination process buds develop as above but, instead of being 



