VI. 



THE BRYALES 



215 



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 Phascum 

 cuspidatuin, optical section, X175; 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 Ephemcriim pliascoidcs, X350; sp, archesporium. C, D, 

 after Kienitz-Gerloff ; E, after Miiller. 



