170 R. BRAITHWAITE ON THE HISTOLOGY OF PLANTS. 



Fig. 4. — Cell division in CEdogonium apophysatum. X 670. 



a. — Cell preparing to divide, c^ its cellulose case, c^ ditto of the 

 mother cell, o. a third case or sheath over the lower cell, 

 truncate at top, n. nucleus, s. annular fold of the cellulose 

 case. 



h. — Division of the mother-cell commencing, m. partition 

 between the two new daughter-cells. 



c. — Division completed, o. sheath, d. c. daughter cell, m. c, 

 mother cell. 

 Fig. 5. — Division of the mother-cell of the spores in Pellia epi- 

 phylla, a. mother-cell, h. the same, with commencing pro- 

 trusions and nuclei, c. spores enclosed in their cellulose 

 case. X 420. 



