Fk;. 2iS4, Section Ihrough cnpule of MarcJutniia, showing wall in -which are cliloro- 

 phyll-bearing air-chambers with air-pores, and gemmte {a\ in varioLit stages of 

 development.— After BoDEL-PmtT. 



^ 



Fro. 28S. Mnrcfianfin pnlymnrpha : the lower figure represents a gametophyte bear- 

 ing a mature aiitheridial branch (</), some young antheridial branches, and also 

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

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

 antheridia within the antheridial cavities (a, b, c, d, i;./).— After Ksv. 



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