Ill 



THE JUNGERMANNIALES 



91 



Fig, 42. — A, \'ertical, B, C, horizontal sections through the apex of Pallavicinia 

 cylindrica; x, apical cell, A, X225; B, C, X450; D, E, Pellia epiphylla; D, ver- 

 tical section; E, horizontal (optical) section, X450. 



