142 



BOTANY. 



changes into a swiftly moving body resembling a serpent with 

 two long lashes attached to its tail. 



F,g. i 9. 



Section of antheridial receptacle from male plant of Marchantia polymorpha, showing 



cavities where the antheridia are borne. 



237. Archegonial plants. — In fig. 122 we see one of the 

 female plants of marchantia. Upon this there are also very 

 curious structures, which remind one of miniature umbrellas. 



Fig. 120. 

 Section of antheridium of mar- 

 chantia, showing the groups of 

 sperm mother cells. 



Fig. 12 1. 

 Spermatozoids of marchantia, 

 uncoiling and one extended, 

 showing the two cilia. 



The general plan of the archegonial receptacle is similar to that 

 01 the antheridial receptacle, but the rays are more pronounced, 



