VI MOSSES {MUSCI) : SPHA GNA CE^E—A NDRE/EA CE^ 1 69 



the nucleus shows a distinct nucleolus. Whether a receptive 

 spot is present is not stated. Mixed with the archegonia are 

 numerous fine hairs like those about the antheridium. The 

 leaves immediately surrounding the group of archegonia later 



Fig. 80. — Spliagntim acuti/oUuin (Ehrh.). Development of the embryo (after Waldner). A-D, 

 Median ..ptical section ; E, F, cross-sections. A, D, E, F', X360; C, X315; D, X153. 



enlarge much and form a perichaetium. By the subsequent 

 elongation of the main axis both archegonial and antheridial 

 branches are often separated by the growth of the axis 

 between them, although at first they are always crowded 

 together at the top of the main stem. 



