,IFE HISTORY OF THE MALE FERN 
21 
Fig. 4. — 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 
archegonium showing sperms (sp.) moving through neck canal (n.c.) toward 
ovum ( e ), and venter ( v ). All highly magnified. 
