HEP A TICyE 



1 67 



Order 5. — Marchaxtiace.^. 



The thallus is flat and ribbon-shaped, and usually branches dicho- 

 tomously from two apical cells; it is frequently furnished with a well- 



'■** re':! '^ 





Fig. 149. — Marchantia folymorpha L. Male 

 plant (natural size). 



Fig. I re- 

 marked 

 distinct 



-M. polymorpha. Male inflorescence 

 and cupule (magnified). 



Fig. 151. — ISI. pclyvtorpha. Female inflo- 

 rescence (magnified). 



Fig. 152. — Fcgatella conicn Cord. Male plant 

 (natural size). 



midrib, and is coriaceous in texture. It is composed of three 

 layers of cells, viz.: — (i) the air-chamber-layer to which the 



