THE BRYOPHYTA: MUSCI, THE MOSSES 



427 



Fig. 412. — Milium /ionium. Apex of sporogonium after removal of operculum, 

 showing peristome in side and top aspects. 



-<, -i ••i^'i 



Operculum 



Outer peristome 

 Inner peristome 



Annulus 



Rim 



Fig. 413. — Funaria hyurometrico. Longitudinal section through part 

 of the operculum and top of theca showing the relationship of the 

 peristome teeth to the thickened rim. {After Latitzius-Betiinga.) 



