FIG. 95. Section through cupule of Marchcmtia, showing wall in which are chloro- 

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

 development. After KNY. 



FIG. 96. Jfarchanfia poh/morpha : the lower figure represents a gametophyte bear- 

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

 eome cupules with toothed margins, in which the gemmae may be seen ; the 

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

 antheridia %vithin the antheridial cavities (a, b, c, d, f.f). After KNY. 



