42 
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 (w.c.) toward ovum 
(e); and venter (z/). All highly magnified. 
