246 BOTAMCAL GAZETTE [march 



Fig. 15. — Fragments in center due to disintegration of walls still attached 

 to column in figs. 13, 14. 



Fig. 16. — Young hairs developed from meristematic basal portions of 

 original segments. 



Fig. 17. — Older stage of same. 



Fig. 18. — Mature hairpit ; meristematic portions of segments seen on 

 side with papillae. 



Fig. 19. — Older pit; long hairs falling off; meristematic portions of seg- 

 ments putting forth papillae and delicate hairs. 



Fig. 20. — Mature conceptacle; delicate hairs being shed; oogonia in all 

 stages from one-celled to complete blocking off of 8 eggs, developed by papu- 

 lation and subsequent segmentation from meristematic portions of original 

 segments; old hairs still seen about the ostiole, as well as fragments scattered 

 through the cavity. 



