Minnesota Plant Life. 



143 



may be regarded as a special development of the liverwort type 

 and among them are found the greatest variety of plant-bodies 

 anywhere in the liverwort group, as well as the large majority 

 of liverwort species. 



None of the liverworts is of any particular economic impor- 

 tance, but they are all of great scientific interest on account of 

 their intermediate position in form, structure and development 

 between more primitive oceanic types of vegetation and later 

 terrestrial types. 



