Mosses and Lichens 



Lid (operculum) . Convex with a tiny point in the centre. 

 Annulus. Simple. 



Teeth (peristomc) . As in the genus Hyp num. 

 Spores. Mature in autumn and winter. 

 Distribution. Common in Europe; widely spread in America; 

 common in the Adirondacks. 



H. triqiictrutn. Portion of 

 peristome showing on the left 

 one outer tooth with annulus 

 cells at its base ; on the right 

 two keeled and perforated in- 

 ner teeth with three spurred 

 cilia between. 



