TAXONOMY 



285. 



body into distinct stem and simple leaves, and the formation of the 

 sexual organs at the end of an axis of a shoot. They are either monoe- 

 cious, when both kinds of sexual organs are borne on the same plant, 



FIG. 154. Hair-cap moss (Polytrichum commune). A, male plant; B, same, 

 proliferating; C, female plant, bearing sporogonium; D, same; g, gametophyte; s, 

 seta; c, capsule; o, operculum; a, calpytra; E, top view of male plant. (Gager.), 



