BRYOPHYTA 



191 



m 



H 



Hi 



Fig. 156. Longitudinal sections of the sporophyte of Anthoceros laevis. A, entire sporo- 

 phyte with foot embedded in the gametophyte, X20; B, basal region, showing origin of 

 sporogenous tissue, X 100; C, higher level, showing spore mother cells, X 100; D, level where 

 spore tetrads are forming, X 100. 



