114 



PLANT STRUCTURES 



ivtl 



The air chambers are outlined on the surface as small 



rhombic areas {areolcp), ea6h containing a single air pore. 



Peculiar reproductive bodies are also developed u^n 



the dorsal surface of MarchcDitia for vegetative multipliciifc 



Fig. 98. Marchantia polymorpha : 1, partial section thronph archegonial di^k, show- 

 ing archcgonia with long necks, and venters containing eggs; .'/. young archego- 

 nium showing axial row; 10. superficial view at later stage; 11, mature archego- 

 nium, with axial row disorganized and leaving an open passage to the large egg; 

 12, cross-section of venter; 13, cross-section of neck.— After Knt. 



tion. Little cups {cnpules) appear, and in them are numer- 

 ous short-stalked bodies (geinmce), which are round and 

 flat (biscuit-shaped) and many-celled (Figs. 95, 96). The 



