FISSIDENTACEAE 99 



pointed, and when held to the light the midrib can 

 usually be seen even if the double portion does not 

 clearly show; while the leaves of hepatics are rounded 

 or lobed, usually curled under at the tips, and there is 

 no midrib. See Introduction (p. 6). The stems of 

 leafy hepatics are usually much branched and often 

 interweave, forming tangled mats, while the stems of 

 Fissidcns are not much branched and can be easily 

 separated. 



