114 



PLANT STKUCTDKES 



The air chambers are outlined on the surface as small 



rhombic areas (areolce), each containing a single air pore. 



Peculiar reproductive bodies are also developed upon 



the dorsal surface of Mufcliaittia for vegetative multiplica- 



FiG. 98. Marchantia pocymorpha : 1, partial section through arctiegonial disk, show- 

 ing archegonia with long ncclcs. and venters roiitainini; egL,^s; 9, young archego- 

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

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

 IJ, cross-section of venter; IS, cross-section of neck. — After Knt. 



tion. Little cups {rvpiih'n) appear, and in them are numer- 

 ous short-stalked bodies {gemmir). which are round and 

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



