Fig. 113. Archegonium of Pttris at the time of fertilization, showing tissne of gam- 

 etophyte (A), the cells forming the neck IB), the passageway formed by the dis- 

 organization of the canal cells (C), and the egg <Z>) lying exposed in the venter, 

 — Caldwell. 



Fig. 114. Antheridium of Pttris [B). showing wall cells (a), opening for escape of 

 sperm mother cells (e), escaped mother cells (c), sperms free from mother cells (b), 

 showing spiral and mnlticiliate character. — Caldwell. 



