G9 



scliicht folds inv/ard along; planes v/hich, if continued to 

 the centre of tjie cell, ..ould cut the protoplast into 4 

 equal parts, presenting the familiar tripajr^tite arrangement 

 (fig, 136). Hov/ever, the partitions are produced inwards 

 only about tv/o-tliirds of t}ie distance to the centre of the 

 cell (fig. 137) , T}ie central portion of the tetrasporan- 

 gium is occupied "by the foujr definitive spore nuclei ,/ith 

 their envelopes of kinoplasm v/hich ai^e in contact v/ith one 

 another, so the.t e, rather definite nucleo-kinoplasmic fliass 

 is formed. In the very centre of t]ie tetrasporangiujn lies 

 the portion of the undifferentiated cytoplasm enclosed \)y 

 the nucleo-kinoplasraic mass (fig. 138). 



The nuclei at this stage are either spherical (fig. 

 139), or somewhat "biscuit shaped, the inner svjfface "being 

 less convex tha.n the outer (fig. 140). The nucleolus has 

 "by this time .fra-gmented into 12-14 granules, similar in 

 appearaiice to those in the nucleolus of the tetraspore 

 motlier ce;i.l before s;mapsis. 



At tjiis point of development, 5-10 "^ of the tetra- 

 sporangia begin to sliov/ degenerative changes and do not de- 

 velop further. The outer sur'face of the tetrasporangium be- 

 comes^ery much flattened, almost v/af er-like . The entire 

 contents of the protoplast stain very heavily, ov/ing to the 



