BRITISH MOSSES. 



41 



of teeth: these are seen to be attached to t., the 

 tympanum, into which the column has expanded. 



FIG. 26. Diagrammatic section of a capsule, col., calyptra ; 

 oper., lid or operculum ; ip., tooth of inner peristome ; 

 op., tooth, of outer peristome ; an., annulus or ring ; col., 

 columella ; sp., wall of the actual spore sac ; ap., region 

 of the aphyse. A. F. 



