VI. 



THE BRYALES 



21 



Fig. 115. — A, Longitudinal section of the young sporogonium of Pleuridium subulatum, 

 X8o; B, part of the same, X600; sp, archesporium; C, young embryo of Phasciim 

 cuspidatum, optical section, X17S; D, cross-section of an older embryo of the 

 same, X350; sp, archesporium; E, longitudinal section of the central part of the 

 young sporogonium of Ephemerum pliascoides, X350; sp, archesporium. C, D, 

 after Kienitz-Gerloff ; E, after MuUer. 



