THE BRYOPHYTES 427 
Fic. 318.—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, calpytra; E, top view of male plant. (Gager.) 
organs are surrounded at the tips by delicate hairy processes 
called paraphyses as well as leaves for protection. The antheridia 
bear the antherozoids, the archegonia, the eggs or ova, as in 
the liverworts. When an abundance of moisture is present, the 
