SUMMARY. 37 



4. Division of the spore-plasm into spores; in Rhhopus, by fur- 

 rows pushing- procrressively in wurd from the surface and outward from 

 the cohmiella c-left, l)oth systems l)ianchinc.-, rurving-, and intersecting 

 to form multinucleated bits of protoplasm, surrounded oidyl)y plasmas- 

 membranes and separated by spaces filled with cell sap only; in Plnj- 

 comyces, by angles forming in certain vacuoles containing a staina))le 

 substance and continuing outward into the spore-plasm as furrows, 

 aided by other furrows from the columella cleft and dividing the 

 protoplasm into bits homologous with and similar to those m Bhizojms, 

 and separated by furrows i)artly tilled with the contents of the vacu- 

 oles that assist in the cleavaoe. 



5. Formation of walls about the spores and columella, and, in the 

 case of Rhizopus, the secretion of an intersporal slime. 



6: Partial disintegration of the nuclei in the columella. 



