IV 



THE JUNGERMANNIACE^ 



77 



half of the young sporogonium at this stage (Fig. 30, A) 

 consists of two tiers, each consisting of four cells. The lower 

 part of the embryo is pointed, and the basal cell either under- 



D, 



Fig. ys.—Spha;roca7-pus terrestris var. Califorincits. A, B, Median longitudinal sections of the 

 archegonium venter, with enclosed embryos, X260; C, an older sporogoniura in median section, 

 X 260 ; D, a still later stage, showing the large space between the archesporial cells and the wall, 

 X85. 



goes no further division or divides but once by a transverse 

 wall, and remains perfectly recognisable in the later 



stages 



(Fig. 30, B, C). The other cells of the lower half divide much 



