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MANUAL OF POISONOUS PLANTS 



Fig. 118a. Antheridium 

 of fern with sperm cells. 

 After Luerssen. 



Fig. 119. Pteris serrulaia. A single 

 archegonium; canal and neck cells; mu- 

 cilage protruding x 350. After Stras- 

 burger. 



.f.ig- 120. Prothallus of Fern. Archegonia above, an- 

 thendia below among the hairs. After Luerssen. 



