Fig. 284. Section through cnpule of Marchantia, showing wall in which are chloro- 

 phyll-bearing air-chambers with air-pores, and gemmae {a) in various stages of 

 development.— After Dodel-Port. 



Fig. 2R5. Marchantia pnlymnrphn : the lower figure represents a pametophyte bear- 

 ing a mature antheridial branch (d), some young antheridial branches, and also 

 some cupules with toothed margins, in which the gemma; may be seen ; the 

 upper figure represents a partial section through the antheridial disk, and shows 

 antheridia within the antheridial cavities (a, b, c, d, «,/).— After Kny. 

 21 



