314 



MANUAL OF POISONOUS PLANTS 



r-'Cl 



Fig. 118a. Antheridiurn 

 of fern with sperm cells. 

 After Luerssen. 



Fig. 119. Pteris serrulata. A single 

 archegonium; canal and neck cells; mu- 

 cilage protruding x 350. After Stras- 

 burger. 



Fig. 120. Prothallus of Fern. Archegonia above, an- 

 theridia below among the hairs. After Lucrssen. 



