HEPATICjE 



167 



Order 5. — Marchantiace^. 



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

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



FiG. 149. — M arckantia. polymorpha L. Male 

 plant (natural size). 



Fig. 151. — M . ^olyviorpka. Female inflo- 

 rescence (magnified). 



Fig. 150. — M, ^olymorpha. Male inflorescence "Pig. z^z.—FegaiellaconicaCoti, Male plant 

 and cupule (magnified). (natural size). 



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

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



