m 



THE JUNGERMANNIALE^ 



02 



Fig. 42. — A, Vertical, B, C, horizontal sections through the apex of Pallavicinia 

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

 tical section; E, horizontal (optical) section, X4S0. 



