IX 



MA RA TTIA CE.E—ISOE TA CEJ-l 



279 



These arc very much smaller than the primary one, but are 

 relatively richer in chromatin. They continue to divide until 

 there are from about thirty to fifty free nuclei, but as yet no 

 trace of cell division can be seen. Most of the nuclei lie in 



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the ventral part of the spore, close to the outer wall, but an 

 occasional one may be detected elsewhere. 



Cell division begins at the apex (ventral part) of the spore. 

 At this time the cytoplasm stains more deeply than before, 

 and sometimes extremely delicate threads may be detected. 



