394 



paticae. Our knowledge of the distribution of species is very much 

 limited. We know next to nothing of the Hepaticae of the en- 

 tire range of the Rocky Mountains south of northern Idaho, and 

 Mr. Leiberg and others who have sent in considerable quantities of 

 interesting plants from farther north have only shown us the stores 

 of information awaiting the collector in that region. Colorado, 

 Utah, the Sierras from Oregon southward, and all the Southwest 

 from Missouri to Texas, New Mexico and Arizona are a great 

 unknown, no less among all of the lower cryptogams than in the 

 Hepaticae. Much more needs to be done throughout all the 

 States of the Mississippi valley, and especially the southern 

 extension of the Appalachian area, which needs the careful atten- 

 tion 'of the resident observer, rather than the hasty notes of the 

 transient collector. It is hoped that the above synopsis and de- 

 scriptions will be sufficient to provide for any student of the group 

 the ready means of identifying his material ; we shall be pleased 

 to receive doubtful material, or that illustrating additional facts of 

 distribution. 



New York, 24 September, 1896. 



