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STRUCTURE AND LIFE HISTORIES 



Fig. 149.' — Hair-cap moss {Polytrichum commune). A, male plant; B, 

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

 gametophyte; s, seta; c, capsule; 0, operculum; a, calyptra, E, top view of 

 male plant. 



