206 
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; 5, seta; c, capsule; o, operculum; a, calyptra, E, top view of 
male plant. 
