IV 



THE JUNGERMANNIACE/E 



105 



only of the wall that projects into the cavity of the cell and 

 forms the characteristic lobes marking the position of the 



Fig. 48. — PorcUa Bolandcri (Aust.). A, Nearly median longitudinal section of an advanced embryo, 

 X260; B, the upper part of a similar embryo, X 525 ; C, sporogenous cells and elaters from a 

 still older sporogonium, X525. 



four spores. The cell cavity is filled with crowded granules, 

 some of which are chloroplasts. The nucleus, which is of 



