Fig. 207, A-E. — Stages in embryonic development of Selaginella niartensii; all figures 

 similarly oriented with respect to archegonium and gametophyte. A , outline of gametophyte 

 with advanced embryo and two-cell stage and a group of rhizoids at upper left, spore coat 

 still surrounding most of gametophyte; B, early embryo, suspensor and cells of archegonial 

 neck; C, later embryo, showing apical cell, a, of stem; D, still later stage in longitudinal sec- 

 tion; E, outline of advanced stage in median section; s, suspensor; r, rhizophore; /, foot; a, 

 apical cell of stem (after Bruchmann, 1909). 



