PHARMACEUTICAL BOTANY 



PIG. 17. A, under surface of a fern prothallium showing archegonia (/)' 

 antheridia (m) and rhizoids (r); B, immature archegonium showing binucleate 

 neck canal cell (n.c.c.), ventral canal cell (v.c.c.), and egg (e); C, mature arche- 

 gonium showing sperms (sp.) moving through neck canal (n.c.}' toward ovum 

 (e); and venter (). All highly magnified. 



