Mosses and Lichens 



The generic name, compounded of two Greek words: 

 a perforation, and 6So>v, a tooth, was suggested by the character 

 of the teeth of one species, Trematodon ambiguum, which often 

 have a cleft or perforation running lengthwise of each tooth. 



Plant. 



T. ambiguum. 

 148 



Plant. 



