LIVERWORTS 



337 



near the apex, which protect the growing point. The plant 

 is dioecious (or heterothallic, see paragraph 421), some of 



Fig. 295- 

 Marchantia plant with cupules and gemmre; rhizoids below. 



them being male and others female. The plant propagates 

 asexually by brood buds developed in little cups with a fringed 

 edge, formed on separate plants (fig. 295). Each of these buds is 

 a miniature thallus of Marchantia, with a growing point in a 

 notch at two opposite points in the flattened nearly circular bud. 



I/ 



Fig. 296. 



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

 cavities where the antheridia are borne. 



22 



