206 



STRUCTURE AND LIFE HISTORIES 



FIG. 149. Hair-cap moss (Polytrichum commune}. A, male plant; B, 

 same, proliferating; C, female plant, bearing sporogonium; Z>, same; g, 

 gametophyte; s, seta; c t capsule; o, operculum; a, calyptra, E, top view of 

 male plant. 



